Size detection device and lamination equipment

Abstract

The utility model relates to a size detection device and lamination equipment, the detection device is used for detecting a composite pole piece, the composite pole piece comprises a plurality of continuous first pole pieces, a plurality of second pole pieces and two insulating parts, and the first pole pieces and the second pole pieces are opposite in polarity. The plurality of first pole pieces are clamped between the two insulating parts and are arranged side by side along the extension direction of the insulating parts, and the plurality of second pole pieces are alternately arranged on the outer side surfaces of the two insulating parts along the extension direction of the insulating parts and are in one-to-one correspondence with the plurality of first pole pieces; the size detection device comprises two shooting assemblies which are respectively arranged at two sides of the composite pole piece along the thickness direction and are respectively used for shooting two adjacent second pole pieces; wherein each shooting assembly comprises four shooting parts which are respectively used for shooting images of four corner areas of the second pole piece; and the controller is in communication connection with the two shooting assemblies, and the controller is configured to obtain size parameters of the composite pole piece according to the shot images.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a size detection device and a lamination device. Background Art

[0002] Lithium-ion batteries are widely used in electric vehicles due to their high energy density, high power density, high cycle life, and long storage life. Laminated lithium-ion batteries, with their superior cycle characteristics, safety, and energy density, have been widely used in recent years.

[0003] The alignment of the positive and negative electrodes in a laminated battery is an important indicator that affects the battery's performance. However, due to the special molding process of this type of battery, how to detect the alignment or other dimensions of the positive and negative electrodes during the production process is a problem that needs to be solved. Utility Model Content

[0004] The purpose of this application is to be able to perform online dimensional detection of composite pole pieces.

[0005] According to a first aspect of the present application, a size detection device is provided for detecting a composite electrode piece, wherein the composite electrode piece includes a plurality of first electrode pieces, a plurality of second electrode pieces, and two insulating members, wherein the first electrode pieces and the second electrode pieces have opposite polarities, the plurality of first electrode pieces are sandwiched between the two insulating members and are arranged side by side and continuously along the extension direction thereof, and the plurality of second electrode pieces are alternately arranged on the outer side surfaces of the two insulating members along the extension direction thereof and correspond one-to-one to the plurality of first electrode pieces; wherein the size detection device includes:

[0006] Two photographing assemblies, respectively provided on both sides of the composite pole piece in the thickness direction, for photographing two adjacent second pole pieces; wherein each photographing assembly includes four photographing components, respectively for photographing the four corner areas of the second pole piece; and

[0007] The controller is in communication with the two shooting components, and is configured to obtain size parameters of the composite pole piece according to the shot images.

[0008] This embodiment provides shooting components on both sides of the composite electrode to detect the second electrode sheets on the front and back sides respectively, thereby realizing online size detection of the composite electrode sheet. During the movement of the composite electrode sheet, the shooting component can detect each second electrode sheet in turn to realize full detection of multiple second electrode sheets, so as to ensure that the size parameters of the composite electrode sheet meet the requirements, especially to ensure the consistency of the width of the negative electrode sheet exceeding the positive electrode sheet, improve the alignment accuracy of the positive electrode sheet and the negative electrode sheet, prevent lithium plating, enable the positive active material of the positive electrode sheet to fully play its role, improve the performance of the electrode assembly formed by the composite electrode sheet, improve the cycle life and fast charging capacity of the battery, and improve the safety of use.

[0009] In some embodiments, the two shooting components are staggered along the extension direction of the composite pole piece.

[0010] This embodiment, by staggering the two shooting components, can provide ample switching time for the time-sharing activation of the two shooting components, making the shooting process of each second pole piece independent of each other, so as to avoid the overlapping activation time periods of the two shooting components causing the light during shooting to affect each other, thereby ensuring the quality of the captured image.

[0011] In some embodiments, the size detection device further includes a position detector for detecting the position of the second pole piece to be photographed, and the controller is configured to trigger the corresponding photographing component to start according to the position of the second pole piece detected by the position detector.

[0012] This embodiment can detect the position of the second pole piece to be photographed through a position detector, so as to accurately control the opening of the photographing component on the corresponding side, so as to reliably realize the complete detection of all second pole pieces and prevent the possibility of missed detection; or it can further determine the opening timing of the photographing component, so as to prevent mutual interference between the two photographing components on the basis of timely photographing the second pole piece, and also reduce the power consumption of the size detection device.

[0013] In some embodiments, the controller is configured to obtain a first deviation distance between the edge of the first pole piece and the edge of the second pole piece, and / or a second deviation distance between the edge of the insulating member and the edge of the wider pole piece of the first pole piece and the second pole piece based on the image acquired by each shooting component.

[0014] This embodiment can obtain the alignment parameters of the corner area of ​​the second pole piece based on the image obtained by each shooting component. For the rectangular second pole piece, after ensuring the alignment of each corner area, the alignment of the entire second pole piece and the first pole piece can be guaranteed, thereby preventing lithium plating, allowing the positive active material of the positive pole piece to fully play its role, improving the performance of the electrode assembly formed by the composite pole piece, and improving the cycle life and fast charging capacity of the battery; it can also ensure the alignment of the insulating part with the first pole piece or the second pole piece in the entire extension direction, thereby preventing a short circuit between the first pole piece and the second pole piece, thereby improving the safety of the battery.

[0015] In some embodiments, the controller is configured to obtain the size of at least one of the first pole piece, the second pole piece and the insulating member along the spacing direction between any two adjacent photographing components in the same photographing assembly based on images captured by any two adjacent photographing components.

[0016] This embodiment can obtain the dimensions of the first pole piece, the second pole piece or the insulating member along the spacing direction between the two adjacent shooting components based on the images obtained by the two adjacent shooting components, thereby online detecting whether the dimensions of the first pole piece, the second pole piece or the insulating member itself meet the requirements during the movement of the composite pole piece, thereby improving the performance of the electrode assembly formed by the composite pole piece.

[0017] In some embodiments, a memory is further included, having a plurality of storage units, each storage unit is associated with the second pole piece, and the controller is configured to store the obtained size parameters in the storage unit associated with the second pole piece.

[0018] This embodiment can store the dimensional parameters of multiple second pole pieces in associated storage units, which is convenient for subsequent rapid positioning or retrieval of the dimensional parameters of a specific second pole piece. For dimensional parameters that do not meet the requirements, the position of the second pole piece can be quickly located, which is beneficial to subsequent data analysis and product improvement.

[0019] In some embodiments, the controller is configured to determine whether the obtained dimensional parameters all meet the preset parameter range, and if so, the composite electrode is subjected to subsequent operations, and if not, the composite electrode is scrapped.

[0020] This embodiment can determine whether the composite electrode sheet is qualified based on the obtained dimensional parameters of the composite electrode sheet, and scrap the unqualified composite electrode sheet before the lamination process, which can improve the production efficiency of the electrode assembly and avoid the impact of unqualified dimensional parameters detected after the electrode assembly is formed on production efficiency.

[0021] In some embodiments, the size detection device also includes two light source groups, which are respectively arranged corresponding to the two shooting components. Each light source group includes a first light source and a second light source with different luminous colors. The first light source and the second light source are respectively arranged on both sides of the composite pole piece along the thickness direction.

[0022] This embodiment uses two light sources with different luminous colors on both sides of the composite pole piece to jointly illuminate, which can not only provide sufficient light for the shooting component to improve the shooting effect, but also penetrate the diaphragm to shoot the edge of the first pole piece blocked by the diaphragm, thereby improving the accuracy and comprehensiveness of the composite pole piece size parameter detection.

[0023] In some embodiments, the size detection device also includes a clamping assembly, which includes two groups of clamping members, which are respectively arranged on both sides of the composite pole piece along the thickness direction and can move along the extension direction of the composite pole piece. The two groups of clamping members are configured to clamp the composite pole piece during the shooting process and maintain synchronous movement with the composite pole piece.

[0024] This embodiment clamps the composite electrode sheet using two sets of clamping members during the imaging process, preventing loosening or warping of the second electrode sheet due to poor composite bonding at the four corners. This allows the second electrode sheet to be tightly bonded to the insulating member in the four corners, preventing dimensional measurement anomalies caused by loosening of the second electrode sheet due to poor composite bonding at the four corners. Furthermore, it ensures a stable distance between the composite electrode sheet and the four imaging components, improving imaging stability and thereby increasing the accuracy of composite electrode sheet dimensional parameter detection. Furthermore, the two sets of clamping members move synchronously with the composite electrode sheet, reducing wear on the composite electrode sheet by the clamping members and preventing the active material on the second electrode sheet from falling off, thereby ensuring the performance of the electrode assembly.

[0025] In some embodiments, the clamping assembly further comprises:

[0026] A first driving component is configured to drive the clamping member to move along the extension direction of the composite pole piece; and

[0027] a second driving component configured to drive the two groups of clamping members away from or towards each other;

[0028] The controller is configured to cause the second driving component to drive the two groups of clamps to move closer to each other to clamp the composite pole piece when the first driving component drives the two groups of clamps to accelerate from an initial position to a running speed of the composite pole piece.

[0029] This embodiment controls the two groups of clamping members to move along the extension direction of the composite electrode piece through the first driving component, and controls the two groups of clamping members to clamp or release the composite electrode piece through the second driving component, so that these two action links can be independent of each other, and the two groups of clamping members can reliably clamp the composite electrode piece during shooting, and the two groups of clamping members can clamp the composite electrode piece when moving to a speed consistent with the running speed of the composite electrode piece, which can reduce the wear on the surface of the composite electrode piece and prevent the active material from falling off.

[0030] In some embodiments, after the shooting assembly completes shooting, the controller is configured to cause the second driving component to drive the two groups of clamps away from each other to release the composite pole piece, and to drive the two groups of clamps back to their initial positions via the first driving component.

[0031] This embodiment can, after the shooting component completes shooting, first cause the two sets of clamping parts to loosen the composite electrode piece, and then return to the initial position in the opposite direction. This can not only ensure that the operation of the composite electrode piece is not affected during the process of the two sets of clamping parts returning to the disposal position and reduce the wear on the second electrode piece, but also can quickly return to the initial position after detaching from the composite electrode piece, so as to clamp the composite electrode piece again when the subsequent second electrode piece is detected.

[0032] According to a second aspect of the present application, there is provided a lamination device, comprising:

[0033] a pole piece composite device configured to composite a plurality of first pole pieces, a plurality of second pole pieces, and two insulating members to form a composite pole piece, wherein the plurality of first pole pieces are continuously arranged;

[0034] a lamination table configured to fold the composite electrode sheets into a laminated electrode assembly; and

[0035] The size detection device of the above embodiment is provided between the electrode composite device and the lamination table, and is used to detect the composite electrode.

[0036] This embodiment detects the dimensional parameters of the composite electrode sheets by installing a dimensional detection device before the lamination station. This allows for online detection during the operation of the composite electrode sheets without affecting the production efficiency of the electrode assembly. After the dimensional parameters of the composite electrode sheets are detected, unqualified composite electrode sheets can be rejected before the lamination process, eliminating the need for further testing after the electrode assembly is formed, thereby improving production efficiency and ensuring the consistency of the quality of the electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0038] Figure 1 Schematic diagram of the module composition of some embodiments of the lamination equipment of the present application.

[0039] Figure 2 1 is a top view of some embodiments of composite pole pieces.

[0040] Figure 3 1 is a side view of some embodiments of a composite pole piece.

[0041] Figure 4 Schematic diagram of the structure of some embodiments of the size detection device of the present application.

[0042] Figure 5 Schematic diagram of the module composition of some embodiments of the size detection device of the present application.

[0043] Figure 6 Schematic diagram of the key dimensional parameters of the composite electrode in this application.

[0044] Figure 7 Schematic diagram of the flow of some embodiments of the size detection method of the present application.

[0045] Figure 8 Schematic diagram of the flow chart of other embodiments of the size detection method of the present application.

[0046] In the drawings, the drawings are not drawn to scale.

[0047] Description of reference numerals:

[0048] 1. Shooting assembly; 1', shooting component; 2. Light source assembly; 21. First light source; 22. Second light source; 3. Clamping assembly; 31. Clamping member; 311. Transition portion; 32. First driving component; 33. Second driving component; 4. Controller; 41. Lower computer; 42. Upper computer; 5. Position detector; 6. Memory; 61. Storage unit;

[0049] 10. Composite pole piece; 11. First pole piece; 111. First main body; 112. First pole tab; 113. Fold; 12. Second pole piece; 121. Second main body; 122. Second pole tab; 13. Insulator;

[0050] 100. Detection device; 200. Pole piece assembly device; 300. Lamination table; 400. Guide roller. DETAILED DESCRIPTION

[0051] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0052] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] This application uses descriptions of directions or positional relationships such as "up", "down", "top", "bottom", "front", "back", "inside" and "outside" to facilitate the description of this application, and does not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as limiting the scope of protection of this application.

[0054] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Perpendicular" does not strictly refer to perpendicularity, but rather to the tolerances allowed. "Parallel" does not strictly refer to parallelism, but rather to the tolerances allowed. The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application.

[0055] It should also be noted that, in the description of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least some embodiments of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] The battery mentioned in the embodiments of this application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack.

[0058] Battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the present application does not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the present application does not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the present application does not limit this.

[0059] Current battery cells typically include a housing and an electrode assembly housed within the housing, which is filled with an electrolyte. The electrode assembly is primarily composed of a first electrode sheet and a second electrode sheet of opposite polarity, stacked or wound together. An insulating member, such as a separator, is typically positioned between the first and second electrode sheets. The portions of the first and second electrode sheets coated with active material constitute the main body of the electrode assembly, while the portions of the first and second electrode sheets uncoated with active material constitute the first and second tabs, respectively. In lithium-ion batteries, the first electrode sheet can be a positive electrode sheet, comprising a positive current collector and positive active material layers disposed on either side of the positive current collector. The positive current collector can be made of, for example, aluminum, and the positive active material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The second electrode sheet can be a negative electrode sheet, comprising a negative current collector and negative active material layers disposed on either side of the negative current collector. The negative current collector can be made of, for example, copper, and the negative active material can be, for example, graphite or silicon. Alternatively, the first electrode sheet can be a negative electrode sheet, with the corresponding second electrode sheet being a positive electrode sheet. The first tab and the second tab can be located at one end of the main body or at both ends of the main body. During the charge and discharge process of the battery cell, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the terminals to form a current loop.

[0060] During use, battery cells are prone to performance degradation and shortened cycle life, and in some cases, even safety issues. Over the years, those skilled in the art have attempted to address this issue from many different perspectives, but none have achieved the desired results.

[0061] As part of the invention process of this application, the inventors conducted numerous tests and verifications, and analyzed the electrode assemblies in the battery cells. They found that one of the reasons for the above-mentioned battery problems is that the width dimension of the negative electrode sheet in the electrode assembly that exceeds the positive electrode sheet fails to remain consistent during the winding process, that is, the alignment accuracy of the negative electrode sheet and the positive electrode sheet in the width direction is low. The existence of this problem may make it difficult for lithium ions to embed into the negative active material area of ​​the negative electrode sheet, causing lithium precipitation, and the positive active material of the positive electrode sheet is also difficult to fully function, thereby affecting the performance of the battery, significantly shortening the cycle life of the battery, limiting the fast charging capacity of the battery, and may also cause safety issues such as combustion and explosion.

[0062] To address this issue, the inventors devised a method for testing the dimensional parameters of the composite electrode sheet formed from the negative electrode sheet, positive electrode sheet, and separator during the electrode assembly forming process. This method ensures that the excess width of the negative electrode sheet relative to the positive electrode sheet and other critical dimensions are met, thereby improving the performance and safety of the electrode assembly. If the composite electrode sheet is found to not meet the dimensional parameters required, it can be promptly removed without further electrode assembly formation.

[0063] However, some current detection devices for laminated electrode assemblies can only detect the dimensional parameters of the electrode assembly after it is formed, while others can only detect the dimensional parameters of single-layer electrode sheets during the coating process. These devices are unable to detect the dimensional parameters of composite electrode sheets. Therefore, the purpose of this application is to provide a dimensional detection device that can perform online dimensional detection of composite electrode sheets.

[0064] like Figure 1 As shown, the size detection device 100 of the present application can be used in a lamination device for producing a laminated electrode assembly. The lamination device includes an electrode assembly device 200, a lamination table 300, and a size detection device 100.

[0065] like Figure 2 and Figure 3 As shown, the electrode assembly device 200 is used to assemble multiple first electrode sheets 11, multiple second electrode sheets 12, and two insulating members 13 to form a composite electrode sheet 10. The lamination stage 300 is configured to fold the composite electrode sheets 10 into a laminated electrode assembly. The size detection device 100 is located between the electrode assembly device 200 and the lamination stage 300 and is used to detect the size parameters of the composite electrode sheet 10.

[0066] The first pole pieces 11 and the second pole pieces 12 have opposite polarities. For example, multiple first pole pieces 11 are arranged continuously, and multiple second pole pieces 12 are independent of each other. Specifically, multiple first pole pieces 11 are sandwiched between two insulating members 13 and arranged continuously side by side along the extension direction thereof. Multiple second pole pieces 12 are arranged alternately on the outer side surfaces of the two insulating members 13 along the extension direction thereof, and correspond one-to-one with the multiple first pole pieces 11. Figure 2 When folded into an electrode assembly, the composite electrode sheet 10 can be folded in a Z-shape. To facilitate folding, a fold 113 can be provided between two adjacent first electrode sheets 11.

[0067] This embodiment detects the dimensional parameters of the composite electrode sheet 10 by providing a dimensional detection device 100 before the lamination table 300. This allows for online detection during the operation of the composite electrode sheet 10, without affecting the production efficiency of the electrode assembly. After the dimensional parameters of the composite electrode sheet 10 are detected, unqualified composite electrode sheets 10 can be rejected before the lamination process, eliminating the need for further testing after the electrode assembly is formed, thereby improving production efficiency and ensuring the consistency of the quality of the electrode assembly.

[0068] Next, the structure of the size detecting device 100 will be described.

[0069] In some embodiments, as Figure 4 and Figure 5As shown, a size detection device 100 is used to inspect a composite electrode sheet 10 and can serve as a size detection device 100 for a laminated electrode assembly. The composite electrode sheet 10 comprises a plurality of first electrode sheets 11, a plurality of second electrode sheets 12, and two insulating members 13. The first electrode sheets 11 and the second electrode sheets 12 have opposite polarities. The plurality of first electrode sheets 11 are sandwiched between the two insulating members 13 and arranged in a continuous, side-by-side pattern along their extension direction. The plurality of second electrode sheets 12 are arranged alternately along the outer sides of the two insulating members 13 along their extension direction, corresponding one-to-one with the plurality of first electrode sheets 11. The size detection device 100 may include a controller 4 and two imaging assemblies 1. The two imaging assemblies 1 are disposed on either side of the composite electrode sheet 10 along its thickness direction, respectively, for capturing images of two adjacent second electrode sheets 12. Each imaging assembly 1 includes four imaging components 1', each for capturing images of the four corners of the second electrode sheet 12. The controller 4 is in communication with the two imaging assemblies 1 and is configured to obtain dimensional parameters of the composite electrode sheet 10 based on the captured images.

[0070] The plurality of second pole pieces 12 are alternately arranged on the outer side surfaces of the two insulating members 13 along their extension direction, and correspond one-to-one with the plurality of first pole pieces 11. In other words, a blank area for the second pole piece 12 is left between two adjacent second pole pieces 12 on the same side of the composite pole piece 10, and the opposite side of each second pole piece 12 along the thickness direction of the composite pole piece 10 is a blank area, where no second pole piece 12 is provided.

[0071] For example, the first electrode 11 can be a positive electrode, and the corresponding second electrode 12 can be a negative electrode; or the first electrode 11 can be a negative electrode, and the corresponding second electrode 12 can be a positive electrode. Since the width of the negative electrode needs to exceed that of the positive electrode, in order to facilitate the arrangement of multiple discrete second electrode pieces 12 on the insulating member 13 on both sides of the first electrode piece 11, so that the continuous first electrode piece 11 provides support for the edge areas of the multiple second electrode pieces 12, it is more preferable to have the first electrode piece 11 be a negative electrode and the second electrode piece 12 be a positive electrode.

[0072] In some embodiments, multiple first electrode sheets 11 are continuously arranged to form a long strip-like structure. Each first electrode sheet 11 can be rectangular, and a fold 113 can be provided between two adjacent first electrode sheets 11 to facilitate the subsequent folding of the composite electrode sheet 10 to form a laminated electrode assembly. The second electrode sheet 12 can be rectangular. If the first electrode sheet 11 is a negative electrode sheet and the second electrode sheet 12 is a positive electrode sheet, the edges of the first electrode sheet 11 all extend beyond the second electrode sheet 12. The insulating member 13 can be a diaphragm, which can form a long strip-like structure to separate the adjacent first electrode sheets 11 and second electrode sheets 12 to prevent short circuits.

[0073] Optionally, during the inspection process, the composite pole piece 10 is in motion, and the direction of motion of the composite pole piece 10 is guided by the guide roller 400. The four shooting components 1' in the shooting assembly 1 can be located above the four corners of the second pole piece 12, respectively. The shooting distances between the four shooting components 1' and the composite pole piece 10 are consistent, that is, for the horizontal extension section of the composite pole piece 10, the four shooting components 1' are located at the same shooting height above or below the composite pole piece 10 to ensure consistency in the distance of the captured images.

[0074] Optionally, the imaging component 1' may employ an area array camera to directly photograph the four corners of the second pole piece 12. For example, a high-frame-rate, small-field-of-view area array camera, such as one with a frame rate of 60 FPS, can meet the high-frequency, single-wafer photography requirements of 1000 mm / s high-speed lamination equipment. The small field of view limits the imaging range of the area array camera to the corners of the second pole piece 12, resulting in clearer images and minimizing distortion caused by objects appearing larger near and smaller far away during imaging, thereby improving the accuracy of dimensional detection.

[0075] The controller 4 is in communication with the two camera assemblies 1, that is, each camera component 1' is in communication with the controller 4. This communication connection includes wired and wireless connections, and any connection that can achieve signal transmission is within the scope of protection of this application. The dimensional parameters of the composite electrode 10 can be obtained based on the image obtained by the associated camera component 1'.

[0076] In some embodiments, the controller 4 may include a slave computer 41 and a host computer 42. The slave computer 41 is configured to receive images captured by each capturing component 1' and transmit the images to the host computer 42 for analysis and processing to obtain the dimensional parameters of the composite electrode 10. Optionally, the slave computer 41 may be a PLC, DSP, or the like. Because image processing requires a large amount of space, image analysis and processing by the host computer 42 does not affect the speed at which the slave computer 41 acquires images, thereby allowing for the timely detection of second electrode pieces 12 whose dimensional parameters do not meet the requirements.

[0077] This embodiment provides shooting components 1 on both sides of the composite electrode 10 to detect the second electrode 12 on the front and back sides respectively, thereby realizing online size detection of the composite electrode 10. During the movement of the composite electrode 10, the shooting component 1 can detect each second electrode 12 in turn, realizing full detection of multiple second electrode pieces 12, so as to ensure that the size parameters of the composite electrode 10 meet the requirements, especially to ensure the consistency of the width of the negative electrode piece exceeding the positive electrode piece, improve the alignment accuracy of the positive electrode piece and the negative electrode piece, prevent lithium plating, enable the positive active material of the positive electrode piece to fully play its role, improve the performance of the electrode assembly formed by the composite electrode piece 10, improve the cycle life and fast charging capacity of the battery, and improve the safety of use.

[0078] Moreover, by using four shooting components 1' to shoot the four corner areas of the second pole piece 12 on the same side of the composite pole piece 10, each shooting component 1' can only shoot a smaller area, which can reduce the image deformation caused by near-large and far-small objects. For the same second pole piece 12, by detecting the alignment with the first pole piece 11 in the four corner areas, the alignment of the entire second pole piece 12 relative to the first pole piece 11 can be guaranteed, thereby improving the accuracy of dimensional parameter detection.

[0079] In some embodiments, the two shooting components 1 are staggered along the extension direction of the composite pole piece 10 .

[0080] For example, the two groups of shooting components 1 can be completely staggered. Specifically, the outer contour envelope of the four shooting components 1' in one group of shooting components 1 forms a first reference frame, and the outer contour envelope of the four shooting components 1' in the other group of shooting components 1 forms a second reference frame. In the extension direction of the composite pole piece 10, there is a preset interval between the first reference frame and the second reference frame.

[0081] This embodiment provides ample switching time for the time-sharing activation of the two shooting components 1 by setting the staggered distance between the two shooting components 1, so that the shooting process of each second pole piece 12 is independent of each other, so as to avoid the overlapping activation time period of the two shooting components 1 causing the light to affect each other during shooting, thereby ensuring the quality of the captured image.

[0082] In some embodiments, the size detection device 100 further includes a position detector 5, which is used to detect the position of the second pole piece 12 to be photographed. The controller 4 is configured to trigger the corresponding photographing component 1 to turn on according to the position of the second pole piece 12 detected by the position detector 5.

[0083] Optionally, the position detector 5 may adopt a contact or non-contact detection sensor. In some embodiments, considering that the second pole piece 12 is relatively thin, a non-contact sensor may be selected, for example, an electromagnetic, photoelectric or Hall detection sensor. The position information of the second pole piece 12 to be photographed detected by the position detector 5 may include which side of the first pole piece 11 the second pole piece 12 is located on, so as to determine the shooting component 1 that needs to be turned on. Optionally, the position information may also include: the distance between the second pole piece 12 to be photographed and the shooting component 1, so as to determine the timing of turning on the shooting component 1. After the shooting is completed, the controller 4 may turn off the shooting component 1. The detection signal of the position detector 5 may be transmitted to the lower computer 41, and the lower computer 41 controls the opening of the shooting component 1.

[0084] This embodiment can detect the position of the second pole piece 12 to be photographed through the position detector 5, so as to accurately control the opening of the photographing component 1 on the corresponding side, so as to reliably realize the complete detection of all the second pole pieces 12 and prevent the possibility of missed detection; or it can further determine the opening timing of the photographing component 1, so as to prevent mutual interference between the two photographing components 1 on the basis of timely photographing the second pole piece 12, and also reduce the power consumption of the size detection device 100.

[0085] In some embodiments, as Figure 6 As shown, the controller 4 is configured to obtain a first deviation distance W1 between the edge of the first pole piece 11 and the edge of the second pole piece 12, and / or a second deviation distance W2 between the edge of the insulating member 13 and the edge of the wider pole piece of the first pole piece 11 and the second pole piece 12 based on the image obtained by each shooting component 1'.

[0086] Specifically, the first pole piece 11 includes a first main body 111 and a first pole ear 112, and the first pole ear 112 can be led out from the first main body 111 on one side of the width direction of the composite pole piece 10; the second pole piece 12 includes a second main body 121 and a second pole ear 122, and the second pole ear 122 can be led out from the second main body 121 on one side of the width direction of the composite pole piece 10, and the first pole ear 112 and the second pole ear 122 can be located on the same side or different sides of the composite pole piece 10.

[0087] For each image captured by the shooting component 1 ', only Figure 6 In the field of view area within the dotted box, in order to establish the physical size corresponding to a single pixel point in the image, the shooting component 1' can be calibrated in advance. In this way, the actual physical distance can be obtained through the corresponding relationship established by calibration by the distance between the pixel points on the edges of any two of the first pole piece 11, the second pole piece 12 and the insulating member 13 in the image.

[0088] The first offset distance W1 between the edge of the first pole piece 11 and the edge of the second pole piece 12 specifically includes: a first sub-offset distance W1x between the first main body portion 111 and the second main body portion 121 along the extension direction of the composite pole piece 10, and a second sub-offset distance W1y between the first main body portion 111 and the second main body portion 121 along the width direction of the composite pole piece 10. The first sub-offset distance W1x and the second sub-offset distance W1y can be obtained simultaneously through the images captured by each shooting component 1'.

[0089] The width of the insulating member 13 generally exceeds the width of the wider of the first and second electrode pieces 11, 12 to prevent short circuits. In some embodiments, because the width of the negative electrode piece exceeds the width of the positive electrode piece, it is necessary to detect whether the width of the insulating member 13 exceeds the width of the negative electrode piece. If the first electrode piece 11 is a negative electrode piece and the second electrode piece 12 is a positive electrode piece, the second offset distance W2 is the distance between the edge of the insulating member 13 and the edge of the first electrode piece 11 along the width direction.

[0090] To obtain the first deviation distance W1 and the second deviation distance W2, a single point can be directly selected on the edge of the first pole piece 11, the second pole piece 12, or the insulating member 13 to calculate the distance between the two points. Alternatively, an image processing algorithm can be used to intelligently fit the edge of the first pole piece 11, the second pole piece 12, or the insulating member 13 to calculate the distance between the two straight lines.

[0091] This embodiment can obtain the alignment parameters of the corner area of ​​the second pole piece 12 based on the image obtained by each shooting component 1'. For the rectangular second pole piece 12, after ensuring the alignment of each corner area, the alignment of the entire second pole piece 12 and the first pole piece 11 can be guaranteed, thereby preventing lithium plating, allowing the positive active material of the positive pole piece to fully play its role, improving the performance of the electrode assembly formed by the composite pole piece 10, and improving the cycle life and fast charging capacity of the battery; it can also ensure the alignment of the insulating part 13 with the first pole piece 11 or the second pole piece 12 in the entire extension direction, thereby preventing a short circuit between the first pole piece 11 and the second pole piece 12, thereby improving the safety of the battery.

[0092] In some embodiments, as Figure 6 As shown, the controller 4 is configured to obtain the size of at least one of the first pole piece 11, the second pole piece 12 and the insulating member 13 along the spacing direction of the two adjacent shooting components 1' based on the images obtained by any two adjacent shooting components 1' in the same shooting assembly 1.

[0093] Specifically, at least one of the following dimensions can be obtained: the dimension of the first pole piece 11 along the width direction and extension direction of the composite pole piece 10, the dimension of the second pole piece 12 along the width direction and extension direction of the composite pole piece 10, and the dimension of the insulating member 13 along the width direction of the composite pole piece 10.

[0094] In order to obtain the corresponding physical distance between any two pixel points in two adjacent images, the adjacent shooting components 1' can be calibrated in advance. The installation distance between the adjacent shooting components 1' can be obtained by measurement, and the corresponding physical distance between two pixel points in two adjacent images can be obtained by a standard calibration tool with known physical dimensions. Therefore, the actual physical distance can be obtained through the distance between the pixel points on the opposite edges of the first pole piece 11, the second pole piece 12 or the insulating member 13 in the adjacent images through the corresponding relationship established by calibration.

[0095] This embodiment can obtain the dimensions of the first pole piece 11, the second pole piece 12 or the insulating member 13 along the spacing direction of the two adjacent shooting components 1' based on the images obtained by the two adjacent shooting components 1', so as to detect online whether the dimensions of the first pole piece 11, the second pole piece 12 or the insulating member 13 themselves meet the requirements during the movement of the composite pole piece 10, thereby improving the performance of the electrode assembly formed by the composite pole piece 10.

[0096] In some embodiments, the size detection device 100 also includes a memory 6 having multiple storage units 61 , each storage unit 61 is associated with the second pole piece 12 , and the controller 4 is configured to store the obtained size parameters in the storage unit 61 associated with the second pole piece 12 .

[0097] Optionally, the address of the storage unit 61 may be associated with the serial number of the second pole piece 12 . After the size parameters of the second pole piece 12 are obtained, they may be associated with the corresponding storage unit 61 for storage according to the serial number of the second pole piece 12 .

[0098] This embodiment can store the dimensional parameters of multiple second pole pieces 12 in the associated storage unit 61, which is convenient for subsequent rapid positioning or retrieval of the dimensional parameters of a specific second pole piece 12. For dimensional parameters that do not meet the requirements, the position of the second pole piece 12 can be quickly located, which is beneficial to subsequent data analysis and product improvement.

[0099] In some embodiments, the controller 4 is configured to determine whether the obtained dimensional parameters all meet the preset parameter range, and if so, the composite electrode 10 performs subsequent operations, and if not, the composite electrode 10 is scrapped.

[0100] Among them, whether the dimensional parameters all meet the preset parameter range refers to whether the alignment parameters and the dimensions of the first pole piece 11, the second pole piece 12, and the insulating member 13 themselves meet their respective preset parameter ranges. The alignment parameters include: a first deviation distance W1 and a second deviation distance W2. If the alignment parameters and the dimensions of the first pole piece 11, the second pole piece 12, and the insulating member 13 all meet their respective preset parameter ranges, it is determined that the dimensional parameters of the composite pole piece 10 meet the requirements, and the composite pole piece 10 is allowed to proceed to the subsequent lamination process. If any dimensional parameters do not meet the requirements, the composite pole piece 10 is directly scrapped and does not need to undergo the subsequent lamination process.

[0101] This embodiment can determine whether the composite electrode sheet 10 is qualified based on the obtained dimensional parameters of the composite electrode sheet 10, and scrap the unqualified composite electrode sheet 10 before the lamination process, which can improve the production efficiency of the electrode assembly and avoid the impact of unqualified dimensional parameters on production efficiency after the electrode assembly is formed.

[0102] In some embodiments, the size detection device 100 also includes two light source groups 2, which are respectively arranged corresponding to the two shooting components 1. Each light source group 2 includes a first light source 21 and a second light source 22 with different luminous colors. The first light source 21 and the second light source 22 are respectively arranged on both sides of the composite pole piece 10 along the thickness direction.

[0103] Optionally, the first light source 21 is located on a side close to the shooting component 1, and the second light source 22 is located on a side away from the shooting component 1. The first light source 21 can be white light to provide fill light for the shooting component 1 located on the same side, so that the shooting component 1 can clearly capture the main features of the composite pole piece 10; the second light source 22 can be red light to provide background light for the shooting component 1 to capture the composite pole piece 10, because red light has a longer wavelength and strong penetrability, and can penetrate the insulating member 13, making the insulating member 13 transparent, so that the four edges of the first pole piece 11 can be clearly reflected in the picture obtained by the shooting component 1, thereby obtaining the dimensional parameters related to the edge of the first pole piece 11, wherein the edge of the first pole piece 11 along the extension direction of the composite pole piece 10 is the fold 113.

[0104] Optionally, the second light source 22 includes a surface light source and a line light source. The surface light source is kept constantly bright and is used to illuminate the edge position of the insulating member 13 along the width direction, so that the edge of the insulating member 13 can still be highlighted on the basis that the insulating member 13 is penetrated, so as to calculate the width of the insulating member 13 and the size of the insulating member 13 exceeding the first pole piece 11 in the width direction. The line light source is high-brightness and strobe-controlled, and is used to penetrate the area within the edge of the insulating member 13. The line light source can be arranged opposite to the first light source 21 to provide background light for the line light source. The back of the second pole piece 12 is illuminated by a combination of a surface light source and a line light source, which can penetrate the insulating member 13 to expose the four edges of the first pole piece 11 for shooting, and can also highlight the edge of the insulating member 13, so that the size parameters of the composite pole piece 10 can be fully obtained through the image obtained by the shooting component 1. In this way, the problem of lighting contradiction caused by using a single light source for the second light source 22 can be solved. That is, if only a constantly bright red light surface light source is used, it is difficult to penetrate the insulating part 13. If only a flashing red light source is used, the entire insulating part 13 is easily penetrated and it is difficult to illuminate the edge of the insulating part 13.

[0105] Optionally, each of the four shooting components 1' in each shooting assembly 1 is provided with an independent first light source 21, and correspondingly, each first light source 21 is provided with a second light source 22 on the back thereof. Alternatively, each two adjacent shooting components 1' along the width direction of the composite pole piece 10 share a long strip of first light source 21. Since the long strip of first light source 21 is generally narrow in width, the first light source 21 extends along the width direction of the composite pole piece 10, and can simultaneously cover the two edges of the first pole piece 11 along the extension direction of the composite pole piece 10 (i.e., the two folds 113) through one first light source 21. It is not necessary to align the first light source 21 with the fold 113 to capture the edge of the first pole piece 11. Alternatively, each two adjacent shooting components 1' along the extension direction of the composite pole piece 10 share a long strip of first light source 21. When setting, it is necessary to align the first light source 21 with the edge of the first pole piece 11 along the extension direction of the composite pole piece 10 so as to capture the edge of the first pole piece 11.

[0106] Optionally, the brightness of the first light source 21 and the second light source 22 is adjustable, so that the brightness of the light emitted by the first light source 21 and the second light source 22 is adjusted to a suitable contrast to meet the demand for clear image shooting and prevent the image from being overexposed.

[0107] Optionally, for an embodiment in which the two shooting components 1 are staggered along the extension direction of the composite pole piece 10, space can be reserved for arranging the light source group 2, and the light emitted by the light source groups 2 corresponding to the two shooting components 1 can be prevented from interfering with each other, thereby improving the image shooting effect.

[0108] Specifically, the first light source 21 emits white light and adopts a long strip light source. The second light source 22 emits red light and may include a line light source and a surface light source. The line light source parameter may be 200,000 Lux, and the surface light source parameter may be 100,000 Lux, with stroboscopic control.

[0109] This embodiment uses two light sources with different luminous colors on both sides of the composite pole piece 10 to jointly illuminate, which can not only provide sufficient light for the shooting component 1 to improve the shooting effect, but also penetrate the insulating part 13 to shoot the edge of the first pole piece 11 blocked by the insulating part 13, thereby improving the accuracy and comprehensiveness of the dimensional parameter detection of the composite pole piece 10.

[0110] In some embodiments, as Figure 4 As shown, the size detection device 100 may also include a clamping assembly 3, which includes two groups of clamping members 31, which are respectively arranged on both sides of the composite pole piece 10 along the thickness direction and can move along the extension direction of the composite pole piece 10. The two groups of clamping members 31 are configured to clamp the composite pole piece 10 during the shooting process and maintain synchronous movement with the composite pole piece 10.

[0111] Among them, the two groups of clamping members 31 are arranged opposite to each other and the distance between them is adjustable. The clamping members 31 can be a plate-shaped structure. The clamping members 31 can use a transparent material, such as acrylic material, so as not to affect the captured image when clamping the four corner areas of the composite electrode 10.

[0112] Optionally, each group of clamps 31 is a plate-like structure that covers at least the entire second pole piece 12, such as a rectangular plate. Alternatively, each group of clamps 31 includes two clamps 31 spaced apart along the width direction of the composite pole piece 10, each clamp 31 extending along the extension direction of the composite pole piece 10, and used to cover two adjacent corner areas of the second pole piece 12 along the extension direction of the composite pole piece 10. The four clamps 31 are arranged opposite each other in pairs. This method further saves material consumption for the clamps 31. Alternatively, one group of clamps 31 uses a single integral clamp 31, and the other group of clamps 31 includes two clamps 31 spaced apart along the width direction of the composite pole piece 10. The number of clamps 31 in each group of clamps 31 is not limited.

[0113] Optionally, the clamping member 31 covers the second pole piece 12 and exposes the four corners of the second pole piece 12 to facilitate detection by the camera assembly 1. The clamping member 31 can be a rectangular plate with outer dimensions smaller than the detection area of ​​the camera assembly 1; or the clamping member 21 can be provided with relief portions at the positions corresponding to the four corners of the second pole piece 12.

[0114] Optionally, in the extension direction of the composite pole piece 10, the clamping member 31 may cover a single second pole piece 12, or may cover more than two second pole pieces 12, so that images of the front and back second pole pieces 12 can be acquired when the composite pole piece 10 is clamped once, reducing the frequency of the two sets of clamping members 31 clamping the composite pole piece 10, thereby simplifying the control difficulty. In order to prevent the edge position of the clamping member 31 from damaging the second pole piece 12 when starting or stopping movement, the clamping member 31 has a transition portion 311 at both ends along the extension direction of the composite pole piece 10. The transition portion 311 can be a plate-like structure that is tilted away from the composite pole piece 10. In this way, when there is a bend at the root of the first pole piece 112 or the second pole piece 122, since the distance between the upper and lower sets of clamping members 31 at the ends is relatively large, the first pole piece 112 or the second pole piece 122 can be guided into the gap therebetween, thereby playing a guiding role.

[0115] During the photographing process, this embodiment clamps the composite electrode sheet 10 with two sets of clamping members 31, which can prevent the second electrode sheet 12 from loosening or warping due to poor composite at the four corners. It can also make the second electrode sheet 12 fit tightly with the insulating member 13 in the four corner areas, preventing the second electrode sheet 12 from loosening in the four corner areas and causing dimensional measurement anomalies. Moreover, it can also ensure that the distance between the composite electrode sheet 10 and the four photographing components 1' is stable, improving the photographing stability, thereby improving the accuracy of the dimensional parameter detection of the composite electrode sheet 10. In addition, the two sets of clamping members 31 move synchronously with the composite electrode sheet 10, which can reduce the wear of the clamping members 31 on the composite electrode sheet 10 and prevent the active material on the second electrode sheet 12 from falling off, thereby ensuring the performance of the electrode assembly.

[0116] In some embodiments, the clamping assembly 3 further includes: a first driving component 32 and a second driving component 33. The first driving component 32 is configured to drive the clamping members 31 to move along the extension direction of the composite pole piece 10. The second driving component 33 is configured to drive the two groups of clamping members 31 to move away from or closer to each other. The controller 4 is configured to, after the first driving component 32 drives the two groups of clamping members 31 to accelerate from an initial position to the operating speed of the composite pole piece 10, cause the second driving component 33 to drive the two groups of clamping members 31 to move closer to each other to clamp the composite pole piece 10.

[0117] The first drive component 32 may include a power component that outputs rotational motion and a reducer that converts the rotational motion output by the power component into linear motion. Alternatively, it may be a power component that outputs linear motion, such as an electric push rod, pneumatic cylinder, or hydraulic cylinder. The second drive component 33 may have two power components with two output ends, each driving the two groups of clamping members 31 in opposite directions to ensure synchronous movement of the two groups of clamping members 31. Alternatively, each clamping member 31 may be provided with a second drive component 33.

[0118] In some embodiments, after the position detector 5 detects the second pole piece 12, the controller 4 issues a command to the first drive component 32 to drive the two sets of clamping members 31 to accelerate from the initial position so as to quickly reach the operating speed of the composite pole piece 10. After reaching the operating speed of the composite pole piece 10, the controller 4 maintains a uniform speed. During this process, the controller 4 issues a command to the second drive component 33 to drive the two sets of clamping members 31 to move closer to each other to clamp the composite pole piece 10. Thereafter, the controller 4 activates the corresponding imaging assembly 1 based on the position of the second pole piece 12 detected by the position detector 5. Optionally, the imaging assembly 1 can also be activated during the movement of the two sets of clamping members 31 or during the process of clamping the composite pole piece 10.

[0119] This embodiment controls the two groups of clamping members 31 to move along the extension direction of the composite electrode 10 through the first driving component 32, and controls the two groups of clamping members 31 to clamp or release the composite electrode through the second driving component 33, so that these two action links can be independent of each other, and the two groups of clamping members 31 can reliably clamp the composite electrode 10 during shooting, and the two groups of clamping members 31 can clamp the composite electrode 10 when moving to a speed consistent with the running speed of the composite electrode 10, which can reduce the wear on the surface of the composite electrode 10 and prevent the active material from falling off.

[0120] In some embodiments, the controller 4 is configured to drive the two groups of clamps 31 away from each other to release the composite pole piece 10 by the second driving component 33 after the shooting assembly 1 completes shooting, and drive the two groups of clamps 31 back to the initial position through the first driving component 32.

[0121] The size of the clamping members 31 can only cover a single second pole piece 12. After the shooting assembly 1 completes shooting, the controller 4 immediately returns the two sets of clamping members 31 to their initial positions to prepare for clamping the next second pole piece 12. Alternatively, the size of the clamping members 31 can also cover two adjacent second pole pieces 12. After the two sets of clamping members 31 clamp the two adjacent second pole pieces 12, the two shooting assemblies 1 respectively capture images of the two second pole pieces 12. After all the shots are completed, the two sets of clamping members 31 are returned to their initial positions to prepare for clamping the next set of two adjacent second pole pieces 12. This method can reduce the number of back-and-forth movements of the clamping members 31, reduce the requirements for their movement speed, and facilitate control.

[0122] This embodiment can, after the shooting component 1 completes shooting, first make the two sets of clamping parts 31 loosen the composite electrode 10, and then return to the initial position in the opposite direction. This can not only ensure that the operation of the composite electrode 10 is not affected during the process of the two sets of clamping parts 31 returning to the disposal position, and reduce the wear on the second electrode 12, but also can quickly return to the initial position after detaching from the composite electrode 10, so as to clamp the composite electrode 10 again when the subsequent second electrode 12 is detected.

[0123] The following will be combined Figure 4 and Figure 5 A specific embodiment of the size detection device 100 of the present application is given.

[0124] like Figure 4 As shown, the size detection device 100 is used to detect the size parameters of the laminated electrode assembly. The composite electrode sheet 10 passes over two guide rollers 400, and the composite electrode sheet 10 extends horizontally between the two guide rollers 400.

[0125] The size detection device 100 may include: a controller 4, two shooting components 1, two light source groups 2 and a clamping component 3, and the two shooting components 1 are staggered along the extension direction of the composite pole piece 10. Each shooting component 1 includes four shooting parts 1', which are respectively used to capture images of the four corner areas of the second pole piece 12, and the controller 4 is configured to obtain the size parameters of the composite pole piece 10 based on the captured images. In addition, the controller 4 can also detect defects such as breakage or missing parts or bent corners of the pole ear in the composite pole piece 10 through the captured images. Each shooting component 1' can be calibrated in advance, for example, by using multi-eye vision technology for joint calibration, and establishing a world coordinate system posture connection for the same shooting component 1, so that the distance measurement across the shooting components 1' can be achieved, and the measurement accuracy can be less than 0.1mm.

[0126] Two light source groups 2 are respectively provided corresponding to the two camera assemblies 1. Each light source group 2 includes a first light source 21 and a second light source 22 emitting light of different colors. The first light source 21 and the second light source 22 are respectively provided on both sides of the composite pole piece 10 along the thickness direction. For example, the first light source 21 can use white light, and the second light source 22 can use red light.

[0127] The clamping assembly 3 includes two sets of clamping members 31, which are respectively provided on both sides of the composite pole piece 10 in the thickness direction and can move along the extension direction of the composite pole piece 10. Both sets of clamping members 31 can adopt a plate-shaped structure and are arranged parallel to each other. The clamping members 31 are located on the side of the first light source 21 and the second light source 22 on the same side close to the composite pole piece 10. The two sets of clamping members 31 are configured to clamp the composite pole piece 10 during the shooting process and maintain synchronous movement with the composite pole piece 10.

[0128] The working principle of this size detection device 100 is as follows: Figure 8 As shown:

[0129] First, the lower computer 41 determines whether to open the upper or lower shooting component 1 based on the position of the second pole piece 12 detected by the position detector 5 and the detection result. If the analysis result is normal, the corresponding shooting component 1 is triggered to take a picture; if the analysis result is abnormal, an alarm is manually processed.

[0130] Secondly, the host computer 42 analyzes the image, and each shooting component 1' shoots a single frame image. The host computer 42 can obtain the image variables of each shooting component 1', run the corresponding image algorithm, and perform straight-line fitting of the characteristic edges of the first pole piece 11, the second pole piece 12 and the insulating member 13 to calculate the overhang distance value between the first pole piece 11 and the second pole piece 12, that is, the distance value of the negative pole piece edge exceeding the positive pole piece edge, or other dimensional parameters can also be calculated.

[0131] Next, the size parameters calculated by the host computer 42 are stored in the storage unit 61 associated with the second electrode 12. The test results of each size parameter are judged to see whether they meet the requirements. If the comprehensive judgment result is normal, the host computer 42 sends an OK signal to the slave computer 41, so that the composite electrode 10 can proceed to the subsequent lamination process; if the comprehensive judgment result is abnormal, the host computer 42 sends an NG signal to the slave computer 41, so that the composite electrode 10 can be scrapped.

[0132] Secondly, the present application also provides a size detection method. In some embodiments, such as Figure 7 As shown, the size detection method includes:

[0133] S110, image capturing step: using the four capturing components 1' in the capturing assembly 1 to respectively capture images of the four corner regions of the corresponding second electrode pieces 12 in the composite electrode piece 10; wherein the composite electrode piece 10 comprises a plurality of continuous first electrode pieces 11, a plurality of second electrode pieces 12, and two insulating members 13, wherein the plurality of first electrode pieces 11 are sandwiched between the two insulating members 13 and arranged side by side along the extending direction of the insulating members 13, and the plurality of second electrode pieces 12 are alternately arranged on the outer side surfaces of the two insulating members 13 along the extending direction thereof, and correspond one-to-one to the plurality of first electrode pieces 11;

[0134] S120, size calculation step: obtaining size parameters of the composite electrode 10 according to the captured image.

[0135] S120 is executed after S110.

[0136] This embodiment detects the second pole pieces 12 on the front and back sides respectively through the shooting components 1 on both sides of the composite pole piece 10, so as to realize online size detection of the composite pole piece 10. During the movement of the composite pole piece 10, the shooting component 1 can detect each second pole piece 12 in turn, and realize the full detection of multiple second pole pieces 12 to ensure that the size parameters of the composite pole piece 10 meet the requirements, especially to ensure the consistency of the width of the negative pole piece exceeding the positive pole piece, improve the alignment accuracy of the positive pole piece and the negative pole piece, prevent lithium plating, and enable the positive active material of the positive pole piece to fully play its role, thereby improving the performance of the electrode assembly formed by the composite pole piece 10, improving the cycle life and fast charging capacity of the battery, and improving the safety of use.

[0137] Moreover, by using four shooting components 1' to shoot the four corner areas of the second pole piece 12 on the same side of the composite pole piece 10, each shooting component 1' can only shoot a smaller area, which can reduce the image deformation caused by near-large and far-small objects. For the same second pole piece 12, by detecting the alignment with the first pole piece 11 in the four corner areas, the alignment of the entire second pole piece 12 relative to the first pole piece 11 can be guaranteed, thereby improving the accuracy of dimensional parameter detection.

[0138] In some embodiments, before the image capturing step S110, the size detection method of the present application further includes:

[0139] Detecting the position of the second pole piece 12 to be photographed;

[0140] The corresponding shooting component 1 is triggered to start according to the detected position of the second pole piece 12 .

[0141] The position of the second pole piece 12 can be detected by a position detector 5. The position detector 5 detects the position of the second pole piece 12 to be photographed, including which side of the first pole piece 11 the second pole piece 12 is located on, to determine which camera assembly to activate. Optionally, this position information may also include the distance between the second pole piece 12 to be photographed and the camera assembly 1, to determine when to activate the camera assembly 1. After the capture is complete, the controller 4 may deactivate the camera assembly 1. The detection signal from the position detector 5 is transmitted to the slave computer 41, which controls the activation of the camera assembly 1.

[0142] This embodiment can accurately control the opening of the shooting component 1 on the corresponding side by pre-detecting the position of the second pole piece 12 to be photographed, so as to reliably realize the complete detection of all the second pole pieces 12 and prevent the possibility of missed detection; or it can further determine the opening timing of the shooting component 1, so as to prevent mutual interference between the two shooting components 1 on the basis of timely photographing the second pole piece 12, and reduce the power consumption during the size detection process.

[0143] In some embodiments, the size calculation step S120 specifically includes:

[0144] According to the images obtained by each shooting component 1', a first deviation distance W1 between the edge of the first pole piece 11 and the edge of the second pole piece 12 and / or a second deviation distance W2 between the edge of the insulating member 13 and the wider edge of the first pole piece 11 and the second pole piece 12 is obtained.

[0145] The specific definitions and determination methods of the first deviation distance W1 and the second deviation distance W2 have been described in the aforementioned embodiments and will not be repeated here.

[0146] This embodiment can obtain the alignment parameters of the corner area of ​​the second pole piece 12 based on the image obtained by each shooting component 1'. For the rectangular second pole piece 12, after ensuring the alignment of each corner area, the alignment of the entire second pole piece 12 and the first pole piece 11 can be guaranteed, thereby preventing lithium plating, allowing the positive active material of the positive pole piece to fully play its role, improving the performance of the electrode assembly formed by the composite pole piece 10, and improving the cycle life and fast charging capacity of the battery; it can also ensure the alignment of the insulating part 13 with the first pole piece 11 or the second pole piece 12 in the entire extension direction, thereby preventing a short circuit between the first pole piece 11 and the second pole piece 12, thereby improving the safety of the battery.

[0147] In some embodiments, the size calculation step S120 specifically includes:

[0148] According to the images captured by any two adjacent photographing components 1 ′ in the same photographing assembly 1 , the size of at least one of the first pole piece 11 , the second pole piece 12 and the insulating member 13 along the spacing direction between the two adjacent photographing components 1 ′ is obtained.

[0149] The size calculation method in this step has been described in the above embodiment and will not be repeated here.

[0150] This embodiment can obtain the dimensions of the first pole piece 11, the second pole piece 12 or the insulating member 13 along the spacing direction of the two adjacent shooting components 1' based on the images obtained by the two adjacent shooting components 1', so as to detect online whether the dimensions of the first pole piece 11, the second pole piece 12 or the insulating member 13 themselves meet the requirements during the movement of the composite pole piece 10, thereby improving the performance of the electrode assembly formed by the composite pole piece 10.

[0151] In some embodiments, in order to determine the size parameters of the composite electrode 10 based on the image, before the image capturing step S110 , the size detection method of the present application further includes:

[0152] Each shooting component 1' in the two shooting assemblies 1 is calibrated to obtain the actual size of a single pixel in an image captured by a single shooting component 1' and / or the distance between any two pixels in two images captured by adjacent shooting components 1'.

[0153] This embodiment calibrates each shooting component 1'. Firstly, it can establish the physical size corresponding to a single pixel point in the image. Thus, the actual physical distance can be obtained through the correspondence established by calibration by measuring the distance between the pixel points on the edges of any two of the first pole piece 11, the second pole piece 12 and the insulating member 13 in the image. Secondly, the corresponding physical distance between two pixel points in adjacent images can be obtained by measuring the installation distance between adjacent shooting components 1' and using a standard calibration tool with known physical size. Thus, the actual physical distance can be obtained through the correspondence established by calibration by measuring the distance between the pixel points on the opposite edges of the first pole piece 11, the second pole piece 12 or the insulating member 13 in the adjacent images.

[0154] In some embodiments, the size detection method of the present application further includes:

[0155] After the size calculation step S120 , the obtained size parameters are stored in a storage unit associated with the second pole piece 12 .

[0156] This embodiment can store the dimensional parameters of multiple second pole pieces 12 in the associated storage unit 61, which is convenient for subsequent rapid positioning or retrieval of the dimensional parameters of a specific second pole piece 12. For dimensional parameters that do not meet the requirements, the position of the second pole piece 12 can be quickly located, which is beneficial to subsequent data analysis and product improvement.

[0157] In some embodiments, after the size calculation step S120, the size detection method of the present application further includes:

[0158] It is determined whether the obtained dimensional parameters all meet the preset parameter range, and if so, the composite electrode piece 10 is made to perform subsequent operations, and if not, the composite electrode piece 10 is scrapped.

[0159] Among them, if the alignment parameters and the dimensions of the first pole piece 11, the second pole piece 12 and the insulating part 13 themselves meet their respective preset parameter ranges, the alignment parameters include: the first deviation distance W1 and the second deviation distance W2, then it is determined that the dimensional parameters of the composite pole piece 10 meet the requirements, and the composite pole piece 10 is allowed to proceed to the subsequent lamination process. If there are dimensional parameters that do not meet the requirements, they are directly scrapped without the need for subsequent lamination processes.

[0160] This embodiment can determine whether the composite electrode sheet 10 is qualified based on the obtained dimensional parameters of the composite electrode sheet 10, and scrap the unqualified composite electrode sheet 10 before the lamination process, which can improve the production efficiency of the electrode assembly and avoid the impact of unqualified dimensional parameters on production efficiency after the electrode assembly is formed.

[0161] In some embodiments, the size detection method of the present application further includes:

[0162] Before shooting, the two groups of clamping members 31 are used to clamp the composite pole piece 10 from both sides of the composite pole piece 10 along the thickness direction, and the two groups of clamping members 31 and the composite pole piece 10 are kept in synchronous movement.

[0163] During the photographing process, this embodiment clamps the composite electrode sheet 10 with two sets of clamping members 31, which can prevent the second electrode sheet 12 from loosening or warping due to poor composite at the four corners. It can also make the second electrode sheet 12 fit tightly with the insulating member 13 in the four corner areas, preventing the second electrode sheet 12 from loosening in the four corner areas and causing dimensional measurement anomalies. Moreover, it can also ensure that the distance between the composite electrode sheet 10 and the four photographing components 1' is stable, improving the photographing stability, thereby improving the accuracy of the dimensional parameter detection of the composite electrode sheet 10. In addition, the two sets of clamping members 31 move synchronously with the composite electrode sheet 10, which can reduce the wear of the clamping members 31 on the composite electrode sheet 10 and prevent the active material on the second electrode sheet 12 from falling off, thereby ensuring the performance of the electrode assembly.

[0164] In some embodiments, the two sets of clamping members 31 clamp the composite pole piece 10 from both sides along the thickness direction of the composite pole piece 10 include:

[0165] The two sets of clamping members 31 are accelerated from their initial positions along the extension direction of the composite pole piece 10;

[0166] When the speed of the two groups of clamping members 31 reaches the running speed of the composite pole piece 10 , the two groups of clamping members 31 are moved closer to each other to clamp the composite pole piece 10 .

[0167] This embodiment can control the two groups of clamping members 31 to move along the extension direction of the composite electrode 10 through the first driving component 32, and control the two groups of clamping members 31 to clamp or release the composite electrode through the second driving component 33, so that these two action links can be independent of each other, and the two groups of clamping members 31 can reliably clamp the composite electrode 10 during shooting, and the two groups of clamping members 31 can clamp the composite electrode 10 when moving to a speed consistent with the running speed of the composite electrode 10, which can reduce the wear on the surface of the composite electrode 10 and prevent the active material from falling off.

[0168] In some embodiments, the size detection method of the present application further includes:

[0169] After the shooting assembly 1 completes the shooting, the two sets of clamping members 31 are moved away from each other to release the composite pole piece 10;

[0170] After releasing the composite pole piece 10 , the two sets of clamping members 31 are returned to their initial positions.

[0171] This embodiment can, after the shooting component 1 completes shooting, first make the two sets of clamping parts 31 loosen the composite electrode 10, and then return to the initial position in the opposite direction. This can not only ensure that the operation of the composite electrode 10 is not affected during the process of the two sets of clamping parts 31 returning to the disposal position, and reduce the wear on the second electrode 12, but also can quickly return to the initial position after detaching from the composite electrode 10, so as to clamp the composite electrode 10 again when the subsequent second electrode 12 is detected.

[0172] In some embodiments, the controller 4 described above can be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present disclosure.

[0173] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A size detection device (100), characterized in that: Used for detecting a composite electrode (10), the composite electrode (10) comprising a plurality of first electrode pieces (11), a plurality of second electrode pieces (12) and two insulating members (13), wherein the first electrode pieces (11) and the second electrode pieces (12) have opposite polarities, the plurality of first electrode pieces (11) are sandwiched between the two insulating members (13) and are arranged side by side and continuously along the extension direction thereof, and the plurality of second electrode pieces (12) are alternately arranged on the outer side surfaces of the two insulating members (13) along the extension direction thereof and correspond one to one with the plurality of first electrode pieces (11); wherein the size detection device (100) comprises: Two photographing assemblies (1), respectively arranged on both sides of the composite pole piece (10) in the thickness direction, and respectively used to photograph two adjacent second pole pieces (12); wherein each of the photographing assemblies (1) comprises four photographing components (1'), respectively used to photograph images of the four corner areas of the second pole piece (12); and A controller (4) is connected to the two shooting components (1) for communication, and the controller (4) is configured to obtain the size parameters of the composite pole piece (10) based on the shot images.

2. The size detection device (100) according to claim 1, characterized in that: The two shooting assemblies (1) are staggered along the extension direction of the composite pole piece (10).

3. The size detection device (100) according to claim 1, characterized in that: It also includes a position detector (5), which is used to detect the position of the second pole piece (12) to be photographed, and the controller (4) is configured to trigger the corresponding shooting component (1) to start according to the position of the second pole piece (12) detected by the position detector (5).

4. The size detection device (100) according to any one of claims 1 to 3, characterized in that: The controller (4) is configured to obtain, based on images acquired by each of the photographing components (1'), a first deviation distance (W1) between an edge of the first pole piece (11) and an edge of the second pole piece (12), and / or a second deviation distance (W2) between an edge of the insulating member (13) and an edge of the wider pole piece of the first pole piece (11) and the second pole piece (12).

5. The size detection device (100) according to any one of claims 1 to 3, characterized in that: The controller (4) is configured to obtain the size of at least one of the first pole piece (11), the second pole piece (12) and the insulating member (13) along the spacing direction between the two adjacent shooting components (1') based on images captured by any two adjacent shooting components (1') in the same shooting assembly (1).

6. The size detection device (100) according to any one of claims 1 to 3, characterized in that: The invention also includes a memory (6) having a plurality of storage units (61), each of the storage units (61) being associated with the second pole piece (12), and the controller (4) being configured to store the obtained size parameters in the storage unit (61) associated with the second pole piece (12).

7. The size detection device (100) according to any one of claims 1 to 3, characterized in that: The controller (4) is configured to determine whether the obtained dimensional parameters all meet a preset parameter range, and if so, to cause the composite electrode (10) to perform subsequent operations, and if not, to cause the composite electrode (10) to be scrapped.

8. The size detection device (100) according to any one of claims 1 to 3, characterized in that: It also includes two light source groups (2), which are respectively arranged corresponding to the two shooting components (1); each light source group (2) includes a first light source (21) and a second light source (22) with different luminous colors; the first light source (21) and the second light source (22) are respectively arranged on both sides of the composite pole piece (10) along the thickness direction.

9. The size detection device (100) according to any one of claims 1 to 3, characterized in that: The invention also includes a clamping assembly (3), wherein the clamping assembly (3) includes two groups of clamping members (31), which are respectively arranged on both sides of the composite pole piece (10) along the thickness direction and can move along the extension direction of the composite pole piece (10). The two groups of clamping members (31) are configured to clamp the composite pole piece (10) during the shooting process and keep synchronous movement with the composite pole piece (10).

10. The size detection device (100) according to claim 9, characterized in that: The clamping assembly (3) further comprises: a first driving component (32) configured to drive the two groups of clamping members (31) to move along the extension direction of the composite pole piece (10); and a second driving component (33) configured to drive the two groups of clamping members (31) to move away from or towards each other; The controller (4) is configured to, after the first driving component (32) drives the two groups of clamping members (31) to accelerate from an initial position to the operating speed of the composite pole piece (10), cause the second driving component (33) to drive the two groups of clamping members (31) to move closer to each other to clamp the composite pole piece (10).

11. The size detection device (100) according to claim 10, characterized in that: The controller (4) is configured to, after the shooting assembly (1) completes shooting, cause the second driving component (33) to drive the two groups of clamping members (31) away from each other to release the composite pole piece (10), and drive the two groups of clamping members (31) to return to the initial position via the first driving component (32).

12. A lamination device, characterized in that: include: A pole piece composite device (200) is configured to composite a plurality of the first pole pieces (11), a plurality of the second pole pieces (12), and two insulating members (13) to form the composite pole piece (10), wherein the plurality of the first pole pieces (11) are arranged continuously; a lamination table (300) configured to fold the composite electrode sheet (10) into a laminated electrode assembly; and The size detection device (100) according to any one of claims 1 to 11 is arranged between the pole piece composite device (200) and the lamination table (300) and is used to detect the composite pole piece (10).

Images