Pole piece coating detection device, pole piece coating dislocation detection system and detection method

Abstract

The invention relates to a pole piece coating detection device, a pole piece coating dislocation detection system and a detection method. The pole piece coating detection device comprises a shell, a moving mechanism and a detection mechanism, the length direction of the shell is along the width direction of the pole piece; the moving mechanism is arranged in the shell and can reciprocate in the length direction of the shell. The moving mechanism is in transmission connection with the detection mechanism and used for driving the detection mechanism to move in the length direction of the shell. The detection end of the detection mechanism is configured to face one surface of the pole piece and is used for detecting the edge of a pole piece base material and the edge of a coating area on the surface in the moving process and outputting corresponding position detection signals. The detection mechanism is driven by the moving mechanism to perform automatic detection, so that uninterrupted online detection is realized, and the detection precision and the detection efficiency are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of lithium battery manufacturing technology, and in particular to an electrode coating detection device, an electrode coating misalignment detection system, and a detection method. Background Technology

[0002] As a core component of lithium-ion batteries, the electrode directly determines the battery's performance and lifespan. Generally, electrodes need to have coating areas on both the front and back surfaces. However, during the coating process, misalignment of the coating areas on the front and back sides of the electrode can easily occur.

[0003] The detection methods in related technologies are not only too cumbersome to operate and have low detection accuracy, but also pose certain safety risks and cannot meet the actual needs of electrode production. Summary of the Invention

[0004] To solve or partially solve the problems existing in the related technologies, this application provides an electrode coating detection device and an electrode coating misalignment detection system.

[0005] This application provides a first aspect of an electrode coating inspection device, comprising: a housing, a moving mechanism, and a detection mechanism; wherein the length direction of the housing is along the width direction of the electrode; the moving mechanism is disposed within the housing and is capable of reciprocating along the length direction of the housing; the moving mechanism is drively connected to the detection mechanism and is used to drive the detection mechanism to move along the length direction of the housing; the detection end of the detection mechanism is configured to face a surface of the electrode, and is used to detect the edge of the electrode substrate and the edge of the coating area on the surface during movement, and output a corresponding position detection signal.

[0006] Furthermore, in the above-mentioned electrode coating detection device, the detection mechanism includes: a support frame and a sensor; wherein, the support frame is connected to the moving mechanism and can reciprocate along the length direction of the housing with the moving mechanism; the sensor is mounted on the support frame, and the detection end of the sensor is configured to face one surface of the electrode, for detecting the edge of the electrode substrate and the edge of the coating area on the surface during the movement, and outputting a corresponding position detection signal.

[0007] Furthermore, in the above-mentioned electrode coating detection device, the moving mechanism includes a linear drive assembly and a slider; a slide rail is provided along the length direction on the inner bottom wall of the housing; the slider is slidably disposed on the slide rail; the linear drive assembly is fixed inside the housing, and its output end is connected to the slider for driving the slider to reciprocate along the slide rail; the detection mechanism is fixedly connected to the slider.

[0008] Furthermore, in the above-mentioned electrode coating detection device, the linear drive assembly includes: a drive mechanism and a linear transmission mechanism; wherein, the linear transmission mechanism is connected to the output end of the drive mechanism, and the slider is connected to the output end of the linear transmission mechanism.

[0009] Furthermore, in the aforementioned electrode coating detection device, the linear transmission mechanism is any one of a lead screw transmission mechanism, a synchronous belt transmission mechanism, or a gear and rack transmission mechanism.

[0010] Furthermore, the above-mentioned electrode coating detection device also includes a limiting mechanism; wherein the limiting mechanism is disposed in the housing and corresponds to the moving mechanism, and is used to detect that the moving mechanism generates a limiting signal when it reaches the two extreme positions of the reciprocating movement stroke.

[0011] Furthermore, in the above-mentioned electrode coating detection device, the limiting mechanism includes: a sensing sheet and two position sensors; the sensing sheet is fixedly connected to the moving mechanism and can move synchronously with the moving mechanism, and is at least partially located outside the housing; the two position sensors are disposed on the outer wall of the housing and correspond to the two extreme positions of the reciprocating stroke of the moving mechanism, respectively, and are used to issue the limiting signal when the sensing sheet moves with the moving mechanism to the two position sensors.

[0012] Furthermore, in the aforementioned electrode coating detection device, the two opposite sidewalls of the housing are respectively opened... It has a sliding groove and a travel groove; the detection mechanism is placed outside the housing, and the moving mechanism is provided with a first connecting member, which passes through the sliding groove and is connected to the detection mechanism; the sensing sheet passes through the travel groove.

[0013] A second aspect of this application provides an electrode coating misalignment detection system, comprising a control device and two electrode coating detection devices as described above; wherein the two electrode coating detection devices are respectively disposed on both sides of the electrode, and the detection mechanisms of the two electrode coating detection devices face the front and back sides of the electrode respectively; the control device is electrically connected to the detection mechanisms of the two electrode coating detection devices, and is used to receive position detection signals from each detection mechanism, and based on the position detection signals, calculate a first distance between the edge of the electrode substrate on the front side of the electrode and the edge of the coating area, and a second distance between the edge of the electrode substrate on the back side and the edge of the coating area, and determine the difference between the first distance and the second distance, and determine that the front and back coatings of the electrode are misaligned when the difference exceeds a preset value.

[0014] The third aspect of this application provides a method for detecting electrode coating misalignment, comprising the following steps: using an electrode... Using the edge of the substrate as a reference, the front and back sides of the electrode are scanned simultaneously. During the scanning process, the boundary signals of the coating areas on the front and back sides of the electrode relative to the substrate are captured respectively. Based on the boundary signals, the distances from the boundaries of the coating areas on the front and back sides of the electrode to the edge of the substrate are calculated respectively. Based on the difference in the distances from the boundaries of the coating areas on the front and back sides of the electrode to the edge of the substrate, it is determined whether the coatings on the front and back sides of the electrode are misaligned.

[0015] This application achieves full automation of the testing process by using a mobile mechanism to drive the testing mechanism to perform automatic testing. Compared with the manual testing methods in related technologies, this application eliminates the errors introduced by human operation and significantly improves the testing accuracy. In addition, this application can achieve uninterrupted online testing, which not only greatly improves the testing efficiency, but also effectively avoids direct contact between personnel and production equipment, reducing safety risks.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0018] Figure 1 This is a schematic diagram of the electrode coating detection device shown in the embodiments of this application; Figure 2 This is another structural schematic diagram of the electrode coating detection device shown in the embodiments of this application; Figure 3 This is another structural schematic diagram of the electrode coating detection device shown in the embodiments of this application; Figure 4 This is a schematic diagram of the limiting mechanism shown in the embodiments of this application; Figure 5 This is a front view of the electrode sheet shown in the embodiments of this application; Figure 6 This is a schematic diagram of the electrode coating detection system shown in the embodiments of this application; Figure 7 This is a schematic flowchart illustrating the electrode coating detection method in an embodiment of this application; Figure label: 100. Housing; 110. Slide groove; 120. Slide rail; 130. Crossbeam; 140. Base plate; 150. Stroke groove; 160. Housing body; 170. Side plate; 200. Moving mechanism; 210. First connecting member; 220. Support frame; 221. Side plate; 222. Top plate; 230. Slider; 240. Second connecting member; 250. Servo motor; 260. Screw; 270. Nut; 280. First support base; 290, Second support base; 300, Detection mechanism; 310, Sensor; 400, Electrode; 410, Edge of electrode substrate; 420, Edge of coating area; 430, Coating area; 440, Electrode substrate; 500, Cable protection chain; 510, Bracket; 600, Limiting mechanism; 610, Sensing sheet; 620, Position sensor; 630, First bracket; 640, Second bracket; 700, Electrode coating detection device. Detailed Implementation

[0019] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0020] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0021] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] As a core component of lithium-ion batteries, the electrode directly determines the battery's performance and lifespan. Generally, electrodes require coating areas on both the front and back surfaces. However, during the coating process, misalignment of the coating areas on both sides is easily caused. Existing detection methods are not only overly cumbersome and inaccurate, but also pose certain safety risks.

[0023] To address the aforementioned problems, this application provides an electrode coating detection device that can at least partially solve these problems.

[0024] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0025] See Figures 1 to 3 An electrode coating detection device according to one embodiment of this application includes: a housing 100, a moving mechanism 200, and a detection mechanism 300.

[0026] In specific implementation, the length direction of the housing 100 ( Figure 1 Direction A in the figure can be along the width direction of electrode 400. Figure 5 (in the B direction), the electrode along Figure 5 Transmission is shown in direction C.

[0027] In one specific implementation, the housing 100 can be a long strip box, and the length direction of the housing 100 can be parallel to the width direction of the electrode 400, so that the moving direction of the detection mechanism 300 is perpendicular to the extending direction of the coating area 430 on the electrode 400, thereby enabling the detection mechanism 300 to effectively identify the edge position of the coating area 430 during the movement.

[0028] The moving mechanism 200 is disposed inside the housing 100 and can reciprocate along the length of the housing 100.

[0029] The moving mechanism 200 is connected to the detection mechanism 300 via a transmission connection, and is used to drive the detection mechanism 300 along the housing. The length direction of the movement is 100. The detection end of the detection mechanism 300 is configured to face a surface of the electrode 400, for detecting the electrode substrate edge 410 and the coating area edge 420 of the surface during the movement, and outputting the corresponding position detection signal.

[0030] It should be noted that the surface of electrode 400 refers to either the front or back side of the electrode.

[0031] In one specific implementation, the detection mechanism 300 can be disposed outside the housing 100. In one example, the housing 100 has a groove 110 along its length, and the moving mechanism 200 is provided with a first connector 210. The first connector 210 passes through the groove 110 and extends outside the housing 100 and is connected to the detection mechanism 300. The first connector 210 can drive the detection mechanism 300 to reciprocate along the length of the housing 100.

[0032] In another specific implementation, the detection mechanism 300 can be housed inside the housing 100 to achieve better sealing and protection. In this case, a long strip-shaped detection window is opened on the wall surface of the housing 100 opposite to the electrode 400, along the length of the housing 100. The width of the detection window must ensure that the detection end of the detection mechanism 300 can effectively cover its detection field of view throughout its movement, thereby ensuring continuous scanning and detection of the coating area 430 on the surface of the electrode 400 and the edge 410 of the electrode substrate.

[0033] See Figure 5 After the coating process is completed, the surface of the electrode 400 will form a coated area 430 and an uncoated electrode substrate 440. Due to the differences in material and color between the coated area 430 and the electrode substrate 440, a certain contrast is formed in color and grayscale. The coated area 430 can extend along the length of the electrode 400 ( Figure 5 The direction C shown extends and has a certain width. Figure 5 (Direction B shown).

[0034] In one specific implementation, the groove 110 can be along the length direction of the housing 100 ( Figure 1 The A direction is set so that the scanning trajectory of the detection mechanism 300 during the movement intersects with the extension direction of the coating area 430 on the electrode 400, thereby effectively capturing the boundary of the coating area 430 in the width direction.

[0035] During testing, the edge 410 of the electrode substrate is used as the starting point for testing. The moving mechanism 200 drives the testing mechanism 300 to move along the length of the housing 100 from this starting point. When the testing mechanism 300 identifies the boundary of the coating area 430 that is closest to the edge 410 of the electrode substrate during the movement, it generates and outputs a position detection signal and sends it to the control system. The control system can calculate the distance from the coating area 430 to the edge 410 of the electrode substrate in real time based on the signal and the displacement data of the moving mechanism 200.

[0036] In practical applications, the electrode coating detection device in this embodiment needs to be deployed in pairs, with one set on each of the front and back sides of the electrode 400. During the detection process, since the detection reference on both sides is the same physical location, namely the edge 410 of the electrode substrate, the control system can determine the degree of misalignment of the coating areas on the front and back sides of the electrode by comparing the distance difference between the coating area 430 measured by the electrode coating detection devices on both sides and the common edge.

[0037] This embodiment of the application uses a moving mechanism 200 to drive the detection mechanism 300 to perform automatic detection, realizing the complete automation of the detection process. Compared with the manual detection method in related technologies, this embodiment of the application eliminates the error introduced by human operation and significantly improves the detection accuracy. In addition, this embodiment of the application can realize uninterrupted online detection, which not only greatly improves the detection efficiency, but also effectively avoids direct contact between personnel and production equipment, reducing safety risks.

[0038] In some embodiments, see Figure 1 The detection mechanism 300 may include a support frame 220 and a sensor 310. The support frame 220 is connected to the moving mechanism 200 and can reciprocate along the length of the housing 100 with the moving mechanism 200. The sensor 310 is mounted on the support frame 220, and the detection end of the sensor 310 is configured to face a surface of the electrode 400, for detecting the electrode substrate edge 410 and the coating area edge 420 on this surface during movement, and outputting a corresponding position detection signal.

[0039] In a specific implementation, the support frame 220 can be connected to the first connector 210 and can move synchronously along the slide groove 110 with the first connector 210. The sensor 310 can be a color mark sensor, image sensor, or other sensing device capable of recognizing optical contrast.

[0040] In one specific implementation, the support frame 220 may include a base plate, a side plate 221, and a mounting part. The side plate 221 is connected to the base plate, and the base plate is connected to the first connecting member 210. The sensor 310 is mounted on the side plate 221 to ensure the stability of the detection direction. The mounting part is disposed on the base plate or the side plate 221 and is used to connect to the cable protection chain 500. The outer top wall of the housing 100 has a receiving groove along the length of the housing 100 for accommodating the cable protection chain 500. The cable protection chain 500 is used to accommodate and guide the data connection cable, power cable, etc., of the sensor 310, preventing the cable from tangling, abrading, or being pulled off when moving with the moving mechanism 200.

[0041] In another specific implementation, the support frame 220 may include a base plate, a side plate 221, and a top plate 222. The side plate 221 is connected between the base plate and the top plate 222. The base plate is connected to the first connecting member 210. The sensor 310 is mounted on the side plate 221. The cable protection chain 500 is connected to the top plate 222 via the bracket 510. The outer top wall of the housing 100 is provided with a receiving groove along the length of the housing 100 for accommodating the cable protection chain 500.

[0042] In some embodiments, see Figures 1 to 3 The moving mechanism 200 may include a linear drive assembly and a slider 230. A slide rail 120 is provided along the length direction on the inner bottom wall of the housing 100. The slider 230 is slidably disposed on the slide rail 120. The linear drive assembly is fixed inside the housing 100 and its output end is connected to the slider 230 for driving the slider 230 to reciprocate along the slide rail 120. The detection mechanism 300 is fixedly connected to the slider 230.

[0043] In practice, the testing mechanism 300 can be connected to the first connecting member 210, and the first connecting member 210 can be connected to the slider 230 through the second connecting member 240.

[0044] In some embodiments, the linear drive assembly may include a drive mechanism and a linear transmission mechanism. The linear transmission mechanism is connected to the output end of the drive mechanism, and the slider 230 is connected to the output end of the linear transmission mechanism.

[0045] In this embodiment, the drive mechanism refers to a power source capable of providing rotational output, such as, but not limited to, a servo motor, a stepper motor, etc. The linear transmission mechanism is a mechanism that converts rotational motion into linear motion, such as, but not limited to, lead screw pairs (including ball screw pairs, sliding lead screw pairs, etc.), synchronous belt transmission mechanisms, gear and rack transmission mechanisms, etc.

[0046] In one example, see Figure 3 The linear drive assembly may include a servo motor 250, a screw 260, a nut 270, a first support 280, and a second support 290. The servo motor 250 is fixed within the housing 100 via the first support 280. The screw 260 is rotatably mounted within the housing 100 via the second support 290, and one end of the screw 260 is connected to the output shaft of the servo motor 250. The nut 270 is fitted onto the screw 260 and fixedly connected to the slider 230. The servo motor 250 drives the screw 260 to rotate, thereby causing the nut 270 to move linearly along the slide rail 120.

[0047] In a specific implementation, a crossbeam 130 can be provided on the inner bottom wall of the housing 100, and a base plate 140 can be provided on the crossbeam 130. The slide rail 120 can be provided on the base plate 140. One end of the screw 260 can be connected to the servo motor 250 through a coupling. The base plate 140 and the crossbeam 130 are used to support the moving mechanism 200.

[0048] In this embodiment, a servo motor 250 is used to control the movement of the detection mechanism 300, which makes the movement position of the detection mechanism 300 more precise, thereby improving the accuracy of the coating position detection.

[0049] See Figure 2 In some embodiments, a limiting mechanism 600 may also be included. The limiting mechanism 600 is disposed in the housing 100 and corresponds to the moving mechanism 200. It is used to generate a limiting signal when the moving mechanism 200 reaches the two extreme positions of the reciprocating movement stroke, so as to limit the stroke of the moving mechanism 200. If there is an abnormality, the limiting mechanism can be used to control the moving mechanism 200 to stop, thereby protecting the operational safety of the entire device.

[0050] Further, see Figure 3 and Figure 4 In some embodiments, the limiting mechanism 600 may include a sensing sheet 610 and two position sensors 620. The sensing sheet 610 is fixedly connected to the moving mechanism 200 and can move synchronously with the moving mechanism 200. The sensing sheet 610 is at least partially located outside the housing 100.

[0051] In a specific implementation, the sensing element 610 can be connected to the second connector 240. The sensing element 610 can move synchronously with the slider 230 of the moving mechanism 200. The sensing part of the sensing element 610 extends to the outside of the housing 100 and maintains a sensing distance adapted to the position sensor 620.

[0052] Two position sensors 620 are disposed on the outer wall of the housing 100 and correspond to the two extreme positions of the reciprocating stroke of the moving mechanism 200, respectively, and are used to issue limit signals when the sensing plate 610 moves with the moving mechanism to the two position sensors.

[0053] In practice, the two position sensors 620 can be proximity switches or photoelectric sensors, and can be fixed to the outer wall of the housing 100 by mounting brackets and located at the two extreme positions of the reciprocating stroke of the moving mechanism 200, that is, the start and end points of the stroke.

[0054] If an abnormality occurs in the range of motion of the sensor 310 during the movement of the moving mechanism 200, the moving sensing plate 610 will be detected by the photoelectric sensor 620. The control program will then control the servo motor 250 to cut off the power, thereby stopping the movement of the moving mechanism 200 and preventing collisions between the moving parts and the fixed parts, thus protecting the overall device.

[0055] In one example, the mounting bracket may include a first bracket 630 and a second bracket 640. The first bracket 630 is fixedly connected to the outer wall of the housing 100 by welding, bolting, or other methods. The position sensor 620 is mounted on the second bracket 640. The second bracket 640 can be detachably connected to the first bracket 630 via a mounting groove, whereby the first bracket 630 has a mounting groove along the length of the housing 100, and the second bracket 640 has a sliding part. The first bracket 630 and the second bracket 640 are detachably connected via the sliding part and the mounting groove. This connection method facilitates the installation and debugging of the photoelectric sensor.

[0056] In this embodiment, when the moving mechanism 200 drives the detection mechanism 300 and the sensing plate 610 to move towards the end of the stroke, once the sensing plate 610 enters the sensing area of ​​any position sensor 620, the position sensor 620 will send a limit signal, which can be used to control the servo motor 250 to stop.

[0057] See Figure 1 and Figure 2 In some embodiments, a sliding groove 110 and a travel groove 150 are respectively provided on two opposite side walls of the housing 100. The first connecting member 210 passes through the sliding groove 110, and the sensing plate 610 passes through the travel groove 150. This layout makes the transmission and limiting functions clearly separated, which is convenient for individual processing and maintenance.

[0058] In one specific implementation, the housing 100 includes a housing body 160 and a side plate 170. The housing body 160 can be a U-shaped groove structure with an opening on one long side. The side plate 170 is sealed at the opening end as a cover plate. The two are combined by a sealing element and fasteners to form a sealed accommodating cavity, effectively protecting the internal moving mechanism 200 from environmental pollutants.

[0059] In one example, the travel groove 150 is machined directly on the vertical wall of the shell body 160 opposite to the side plate 170, while the slide groove 110 is formed on the side plate 170 body.

[0060] In another example, the width of the side panel is 170 ( Figure 1The vertical gap is smaller than the corresponding width at the opening of the shell body 160, forming a continuous longitudinal gap at the mating edge of the side plate 170 and the shell body 160. This structural gap is directly used as the slide groove 110. This structure not only saves the process of additionally processing the stroke groove 150, but also avoids the problem of weakening the structural strength caused by separate slotting.

[0061] In this embodiment, the housing 100 can prevent accidental contact by personnel and ensure the safety of operators. At the same time, it can also form a relatively sealed space, effectively blocking external dust and other debris from entering the housing, which is conducive to the stable operation of the entire device.

[0062] The following is a detailed explanation of the specific detection process of the electrode coating misalignment detection system.

[0063] During testing, as the coated electrode sheet is transferred to the detection area of ​​sensor 310 via the roller, servo motor 250 is activated. The power output from the output shaft of servo motor 250 is transmitted to screw 260 via coupling. The rotation of screw 260 drives nut 270 to perform linear reciprocating motion. Nut 270 drives slider 230 to perform linear reciprocating motion along slide rail 120. Sensor 310 can move within the area between the detection starting point (edge ​​410 of electrode substrate) and the detection point (edge ​​420 of coated area). When sensor 310 detects the edge 420 of coated area, sensor 310 sends a signal, and the control program controls servo motor 250 to make sensor 310 return to the detection starting point. At the same time, the distance between edge 420 of coated area and edge 410 of electrode substrate is obtained, thereby performing dynamic cyclic detection.

[0064] This application also proposes an electrode coating misalignment detection system. See [link to relevant documentation] Figure 6 The system includes a control device and two electrode coating detection devices 700 of any one of the above types. The two electrode coating detection devices 700 are respectively disposed on both sides of the electrode 400, and the detection mechanisms of the two electrode coating detection devices 700 face the front and back sides of the electrode 400, respectively. The control device is electrically connected to the detection mechanisms of the two electrode coating detection devices 700, and is used to receive position detection signals from each detection mechanism, and based on the position detection signals, calculate a first distance between the edge of the electrode substrate on the front side of the electrode 400 and the edge of the coating area, and a second distance between the edge of the electrode substrate on the back side of the electrode 400 and the edge of the coating area, respectively, determine the difference between the first distance and the second distance, and determine that the front and back coatings of the electrode 400 are misaligned when the difference exceeds a preset value.

[0065] It should be noted that, in actual implementation, this preset value can be set according to the actual situation, and this embodiment does not impose any limitations on it.

[0066] The specific implementation process of the electrode coating detection device 700 can be found in the above description, and will not be repeated here.

[0067] See Figure 6 In specific implementation, an electrode coating detection device 700 can be disposed on the front side of the electrode 400, with the detection mechanism 300 of the electrode coating detection device 700 facing the front side of the electrode 400; correspondingly, another electrode coating detection device 700 can be disposed on the back side of the electrode 400, with the detection mechanism 300 of the electrode coating detection device 700 facing the back side of the electrode. The control device can be a programmable logic controller, microprocessor, etc., and the control device establishes communication connections with the two electrode coating detection devices 700 respectively.

[0068] As can be seen, in this embodiment of the application, electrode coating detection devices 700 are arranged on both the front and back sides of the electrode 400. Since the detection reference on both sides is the same physical position, namely the edge 410 of the electrode substrate, the control system can determine the degree of misalignment of the coating areas on both sides of the electrode by comparing the distance difference between the coating area 430 and the common edge measured by the electrode coating detection devices 700 on both sides.

[0069] This application embodiment uses a moving mechanism to drive the testing mechanism to perform automatic testing, achieving complete automation of the testing process. Compared with the manual testing methods in related technologies, this application embodiment eliminates errors introduced by human operation and significantly improves testing accuracy. In addition, this application embodiment can achieve uninterrupted online testing, which not only greatly improves testing efficiency but also effectively avoids direct contact between personnel and production equipment, reducing safety risks.

[0070] This application also proposes a method for detecting electrode coating misalignment. See [link to relevant documentation]. Figure 7 The method includes the following steps: Step S710: Using the edge of the electrode substrate as a reference, simultaneously scan the front and back sides of the electrode.

[0071] Specifically, the moving mechanisms of the two electrode coating detection devices drive their respective detection mechanisms respectively. The two detection mechanisms are moved to the edge of the electrode substrate, with both facing the edge to ensure they have the same starting point. The two detection mechanisms are controlled to move synchronously along the width of the electrode, and surface feature signals of the front and back sides of the electrode are acquired in real time. Specifically, surface feature signals of the front and back sides of the electrode can be acquired in real time using a color mark sensor or similar device. In step S720, during the scanning process, the boundary signals of the coated areas on the front and back sides of the electrode relative to the electrode substrate are captured.

[0072] Based on the captured boundary signals of the coated areas, the edges of the coated areas on the front and back of the electrode can be identified separately. Generally, the front and back of the electrode have multiple coated areas; in specific implementations, the coated area closest to the edge of the electrode substrate can be selected.

[0073] Step S730: Based on the boundary signal, calculate the coating area boundaries on the front and back sides of the electrode, respectively. Distance from the edge of the substrate.

[0074] Specifically, a first distance between the edge of the coating area on the front side of the electrode and the edge of the electrode substrate is determined based on the displacement of the detection mechanism on the back side of the electrode, and a second distance between the edge of the coating area on the back side of the electrode and the edge of the electrode substrate is determined based on the displacement of the detection mechanism on the back side of the electrode.

[0075] Step S740: Based on the difference in distance from the boundary of the coating area on the front and back sides of the electrode to the edge of the substrate, Determine whether the coating on the front and back of the electrode is misaligned.

[0076] Specifically, the difference between the first distance and the second distance is determined. When the difference exceeds a preset value, it is determined that there is a misalignment between the front and back coatings of the electrode.

[0077] It should be noted that, in specific implementation, the preset value can be determined according to the actual situation, and this embodiment does not impose any limitations here.

[0078] In this embodiment, when the difference in detection distance obtained from printing on both sides exceeds the allowable misalignment range, the control device can also send a feedback signal to the printing roller to control the movement of the corresponding printing roller, thereby adjusting the printing position so that the misalignment of the printing on the front and back sides of the electrode sheet reaches the set range.

[0079] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An electrode coating detection device, characterized in that, include: Housing, moving mechanism and testing machine Structure; among which, The length of the housing is along the width of the electrode; the moving mechanism is disposed inside the housing and can reciprocate along the length of the housing; the moving mechanism is drively connected to the detection mechanism and is used to drive the detection mechanism along the housing. The body moves along its length; the detection end of the detection mechanism is configured to face a surface of the electrode, for use during movement. During the process, the edge of the electrode substrate and the edge of the coating area on the surface are detected, and the corresponding position detection signal is output.

2. The electrode coating detection device according to claim 1, characterized in that, The testing institution Includes: support frame and sensor; among which, The support frame is connected to the moving mechanism and can move along the housing along with the moving mechanism. It moves back and forth along its length; The sensor is mounted on the support frame, and the detection end of the sensor is configured to face one surface of the electrode sheet, for detecting the edge of the electrode sheet substrate and the edge of the coated area on the surface during movement, and outputting a corresponding position detection signal.

3. The electrode coating detection device according to claim 1, characterized in that, The moving mechanism includes: a linear drive assembly and a slider; a slide rail is provided on the inner bottom wall of the housing along the length direction; the slider is slidably disposed on the slide rail; the linear drive assembly is fixed inside the housing and its output end is connected to the slider for driving the slider to reciprocate along the slide rail; the detection mechanism is fixedly connected to the slider.

4. The electrode coating detection device according to claim 3, characterized in that, The linear drive assembly includes: a drive mechanism and a linear transmission mechanism; wherein... The linear transmission mechanism is connected to the driving mechanism, and the slider is connected to the output end of the linear transmission mechanism.

5. The electrode coating detection device according to claim 4, characterized in that, The linear transmission mechanism is any one of the following: lead screw transmission mechanism, synchronous belt transmission mechanism, and gear and rack transmission mechanism.

6. The electrode coating detection device according to claim 1, characterized in that, Also includes: A limiting mechanism; wherein the limiting mechanism is disposed in the housing and corresponds to the moving mechanism, and is used to detect when the moving mechanism reaches two extreme positions of the reciprocating movement stroke to generate a limiting signal.

7. The electrode coating detection device according to claim 6, characterized in that, The limiting mechanism includes: a sensing plate and two position sensors; The sensor is fixedly connected to the moving mechanism and can move synchronously with the moving mechanism, and is at least partially located outside the housing; The two position sensors are disposed on the outer wall of the housing and correspond to the two extreme positions of the reciprocating stroke of the moving mechanism, respectively, and are used to issue the limit signal when the sensing plate moves with the moving mechanism to the two position sensors.

8. The electrode coating detection device according to claim 7, characterized in that, The two opposite sidewalls of the housing are respectively provided with a sliding groove and a travel groove; The detection mechanism is located outside the housing, and the moving mechanism is provided with a first connecting member. The first connector passes through the slide groove and is connected to the detection mechanism; The sensing element is inserted into the travel groove.

9. A system for detecting misalignment in electrode coating, characterized in that, It includes a control device and two electrode coating detection devices as described in any one of claims 1 to 8; wherein, The two electrode coating detection devices are respectively disposed on both sides of the electrode, and the two electrodes... The detection mechanisms of the coating detection device face the front and back of the electrode, respectively; the control device is electrically connected to the detection mechanisms in both electrode coating detection devices, and is used for... The system receives position detection signals from each detection agency and calculates the results based on these signals. Calculate the first distance between the edge of the electrode substrate on the front side and the edge of the coating area, and the distance between the electrode substrate on the back side. The second distance between the material edge and the edge of the coating area, and the distance between the first distance and the second distance are determined. The difference, and when the difference exceeds a preset value, determining that the front and back coatings of the electrode are misaligned. Bit.

10. A method for detecting misalignment in electrode coating, characterized in that, Includes the following steps: Using the edge of the electrode substrate as a reference, the front and back sides of the electrode are scanned simultaneously; during the scanning process, the coated areas of the front and back sides of the electrode are captured relative to the substrate. The boundary signal of the electrode substrate; based on the boundary signal, the boundaries of the coating areas on the front and back sides of the electrode are calculated to the specified values. The distance to the edge of the substrate; based on the difference in distance from the boundary of the coating area on the front and back sides of the electrode to the edge of the substrate. Determine whether the coating on the front and back of the electrode is misaligned.

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