Coating equipment and coating method

Abstract

The present application discloses a coating device and coating method, which drives the battery cell to move through a magnetic drive conveying device. During the movement of the battery cell, the position of the magnetic suspension mover is determined based on the preset position in the magnetic suspension guide rail, and the position of the magnetic suspension mover is transmitted to the encoder as the position of the battery cell, so that the encoder outputs a pulse signal based on the position change of the magnetic suspension mover to trigger the image acquisition device to capture the image of the battery cell. Compared with the traditional method of controlling the line scan camera to capture the image of the battery cell based on the grating ruler and grating encoder, the solution provided in the embodiment of the present application has lower installation accuracy requirements, is easier to implement, and is less affected by the environment, making the output image more accurate.

Description

Technical Field

[0001] The present application belongs to the field of battery manufacturing, and in particular relates to a coating device and a coating method. Background Art

[0002] At present, it is necessary to capture images of the battery cells during the coating and shelling process of the battery to determine whether there are defects in the film layer coated on the surface of the battery cells. In the existing related technologies, the battery cells are mainly driven to move by a carrier, and the grating scale on the carrier is read by the grating encoder reader during the movement, so as to control the machine line scan camera to capture the image of the battery cells and detect defects in the film layer based on the image. However, this method has high requirements for the installation of the grating scale and the reader, which is not easy to implement, and due to the contamination of the grating scale, it is easy to cause inaccurate output. Summary of the invention

[0003] The embodiments of the present application provide a coating device and method, which reduce the difficulty of collecting battery cell images in the coating and shelling process and improve the accuracy of battery cell images.

[0004] In a first aspect, an embodiment of the present application provides a coating device, including: a magnetic drive conveying device, an encoder, and an image acquisition device;

[0005] The magnetic drive conveying device includes: a magnetic suspension mover, a magnetic suspension guide rail and a position detection module;

[0006] The magnetic suspension mover is used to carry the battery core, and the surface of the battery core is covered with a film layer;

[0007] The magnetic suspension guide rail is used to drive the magnetic suspension mover to transport the battery cells along the conveying direction;

[0008] The magnetic suspension guide rail is provided with a plurality of preset positions along the conveying direction;

[0009] The position detection module is used to determine the position of the magnetic suspension mover based on multiple preset positions during the process of the magnetic drive conveying device conveying the battery core, and to send the position of the magnetic suspension mover to the encoder;

[0010] The encoder is used to generate a pulse signal based on the position of the magnetic suspension mover, and send the pulse signal to the image acquisition device;

[0011] The image acquisition device is used to acquire the image of the battery cell based on the pulse signal.

[0012] The technical solution of this embodiment uses a magnetic drive conveying device to drive the battery cell to move. During the movement of the battery cell, the position of the magnetic suspension mover is determined based on the preset position in the magnetic suspension guide rail, and the position of the magnetic suspension mover is transmitted to the encoder as the position of the battery cell, so that the encoder outputs a pulse signal based on the position change of the magnetic suspension mover to trigger the image acquisition device to capture the image of the battery cell. Compared with the traditional method of controlling the line scan camera to capture the image of the battery cell based on the grating ruler and grating encoder, the solution provided by the embodiment of the present application has lower installation accuracy requirements, is easier to implement, and is less affected by the environment, making the output image more accurate.

[0013] In some embodiments, the position detection module includes a controller and a plurality of position sensors sequentially arranged along the magnetic suspension rail, and the plurality of position sensors correspond one-to-one to a plurality of preset positions of the magnetic suspension rail;

[0014] The position sensor is used to send a sensing signal to the controller when sensing the magnetic suspension mover;

[0015] The controller is used to use the preset position corresponding to the last received induction signal as the position of the magnetic levitation mover, and send the position of the magnetic levitation mover to the encoder. The preset position corresponding to the induction signal is the preset position corresponding to the position sensor that sends the induction signal.

[0016] In this way, the position of the magnetic suspension mover can be detected.

[0017] In some embodiments, the image acquisition device is disposed on the side of the magnetic drive conveying device, and the optical axis of the image acquisition device is perpendicular to and intersects with the detection surface of the battery cell;

[0018] The plurality of position sensors include a starting position sensor and an end position sensor;

[0019] The starting position sensor is installed at a first preset position of the magnetic suspension guide rail, the first preset position is on the upstream side of the image acquisition position, and the distance between the first preset position and the image acquisition position is a first distance, and the image acquisition position is the position where the parallel line of the magnetic suspension guide rail and the optical axis of the image acquisition device intersects;

[0020] The end position sensor is installed at a second preset position of the magnetic suspension guide rail, the second preset position is on the downstream side of the image acquisition position, and the distance between the second preset position and the image acquisition position is a second distance, and the second distance is greater than or equal to the length of the detection surface of the battery cell;

[0021] The controller is also used to send the position of the magnetic suspension mover to the encoder once in each preset time period starting from receiving the induction signal sent by the starting position sensor until receiving the induction signal sent by the end position sensor.

[0022] In this way, the encoder can output a pulse signal to the image acquisition device from the time the magnetic levitation mover reaches the first preset position until the magnetic levitation mover reaches the second preset position. That is, the encoder outputs a pulse signal when the magnetic levitation mover passes through the image acquisition device, so that the image acquisition device can capture a complete image of the battery cell during the movement of the magnetic levitation mover.

[0023] In some embodiments, the encoder is also used to determine the displacement of the magnetic levitation mover based on the received position of the magnetic levitation mover in each preset time period, and use the ratio of the displacement to the resolution of the encoder as the number of pulses to generate a pulse signal corresponding to the number of pulses.

[0024] In this way, a pulse signal corresponding to the displacement change of the battery cell can be obtained in each preset time period, so that the image acquisition device is controlled by the pulse signal to acquire images of the battery cell at a certain frequency.

[0025] In some embodiments, the controller is further used to calculate the position of the magnetic suspension mover based on a preset verification algorithm to obtain a first verification code, and send the position of the magnetic suspension mover and the first verification code to the encoder;

[0026] The encoder is also used to: calculate the received position of the magnetic levitation mover based on the verification algorithm to obtain a second verification code, compare the second verification code with the received first verification code, and generate a pulse signal based on the position of the magnetic levitation mover when the second verification code is consistent with the first verification code.

[0027] In this way, the accuracy and integrity of the position of the magnetic suspension mover can be improved.

[0028] In some embodiments, the image acquisition device includes a line scan camera;

[0029] The image acquisition device is also used to acquire a line of image each time a pulse is received. When the line height of the acquired image is equal to the preset line height, the acquired images are combined into one image, and the combined image is used as the image of the detection surface of the battery cell.

[0030] In this way, the image acquisition device can output a complete image of the battery cell detection surface when the magnetic levitation mover moves based on the pulse signal output by the encoder and the preset line height. The output is stable and the object detected by the image acquisition device completely corresponds to the actual measurement object, which is conducive to accurate calibration of the data.

[0031] In a second aspect, an embodiment of the present application provides a coating method, the method comprising:

[0032] The battery core is placed on the magnetic suspension mover, and the surface of the battery core is coated with a film layer;

[0033] The magnetic suspension guide rail drives the magnetic suspension mover to transport the battery cell along the transport direction;

[0034] In the process of the magnetic suspension mover conveying the battery core, the position of the magnetic suspension mover is determined based on a plurality of preset positions in the magnetic suspension guide rail by a position detection module, and the position of the magnetic suspension mover is sent to an encoder;

[0035] The encoder generates a pulse signal based on the position of the magnetic suspension mover and sends the pulse signal to the image acquisition device;

[0036] The image acquisition device acquires the image of the battery cell based on the pulse signal.

[0037] The technical solution of this embodiment uses a magnetic drive conveying device to drive the battery cell to move. During the movement of the battery cell, the position of the magnetic suspension mover is determined based on the preset position in the magnetic suspension guide rail, and the position of the magnetic suspension mover is transmitted to the encoder as the position of the battery cell, so that the encoder outputs a pulse signal based on the position change of the magnetic suspension mover to trigger the image acquisition device to capture the image of the battery cell. Compared with the traditional method of controlling the line scan camera to capture the image of the battery cell based on the grating ruler and grating encoder, the solution provided by the embodiment of the present application has lower installation accuracy requirements, is easier to implement, and is less affected by the environment, making the output image more accurate.

[0038] In some embodiments, the position detection module includes a controller and a plurality of position sensors sequentially arranged along the magnetic suspension rail, the plurality of position sensors corresponding one by one to a plurality of preset positions in the magnetic suspension rail, and the position sensors are used to send a sensing signal when sensing the magnetic suspension mover;

[0039] The position of the magnetic suspension mover is determined based on a plurality of preset positions in the magnetic suspension guide rail by a position detection module, including:

[0040] The controller uses the preset position corresponding to the last received induction signal as the position of the magnetic suspension mover, and the preset position corresponding to the induction signal is the preset position corresponding to the position sensor that sends the induction signal.

[0041] In this way, the position of the magnetic suspension mover can be detected.

[0042] In some embodiments, the plurality of position sensors include a starting position sensor and an end position sensor, and transmit the position of the magnetic suspension mover to the encoder, including:

[0043] Starting from receiving the induction signal sent by the starting position sensor, the position of the magnetic suspension mover is sent to the encoder once in each preset time period until the induction signal sent by the end position sensor is received.

[0044] In this way, the encoder can output a pulse signal to the image acquisition device from the time the magnetic levitation mover reaches the first preset position until the magnetic levitation mover reaches the second preset position. That is, the encoder outputs a pulse signal when the magnetic levitation mover passes through the image acquisition device, so that the image acquisition device can capture a complete image of the battery cell during the movement of the magnetic levitation mover.

[0045] In some embodiments, the encoder generates a pulse signal based on the position of the magnetic suspension mover, including:

[0046] Determine the displacement of the magnetic suspension mover based on the position of the magnetic suspension mover in each preset time period;

[0047] The ratio of displacement to encoder resolution is taken as the number of pulses;

[0048] Generate a pulse signal corresponding to the number of pulses.

[0049] In this way, a pulse signal corresponding to the displacement change of the battery cell can be obtained in each preset time period, so that the image acquisition device is controlled by the pulse signal to acquire images of the battery cell at a certain frequency.

[0050] In some embodiments, sending a pulse signal to an image acquisition device includes:

[0051] The pulse signal is sent to the image acquisition device by differential transmission.

[0052] In this way, the anti-interference ability of the pulse signal can be increased.

[0053] In some embodiments, sending the position of the magnetic suspension mover to the encoder includes:

[0054] The position detection module calculates the position of the magnetic suspension mover based on a preset verification algorithm to obtain a first verification code;

[0055] Sending the position of the magnetic suspension mover and the first check code to the encoder;

[0056] The encoder generates pulse signals based on the position of the magnetically suspended mover, including:

[0057] The encoder calculates the received position of the magnetic suspension mover based on the verification algorithm to obtain a second verification code;

[0058] comparing the second check code with the received first check code;

[0059] When the second check code is consistent with the first check code, a pulse signal is generated based on the position of the magnetic suspension mover.

[0060] In this way, the accuracy and integrity of the position of the magnetic suspension mover can be improved.

[0061] In some embodiments, the image acquisition device includes a line scan camera, and the image acquisition device acquires an image of the detection surface of the battery cell based on the pulse signal, including:

[0062] The image acquisition device acquires a line of image each time it receives a pulse;

[0063] When the row height of the collected images is equal to the preset row height, the collected images are combined into one image;

[0064] The composed image is used as the image of the detection surface of the battery cell.

[0065] In this way, the image acquisition device can output a complete image of the battery cell detection surface when the magnetic levitation mover moves based on the pulse signal output by the encoder and the preset line height. The output is stable and the object detected by the image acquisition device completely corresponds to the actual measurement object, which is conducive to accurate calibration of the data.

[0066] In some embodiments, before the image acquisition device acquires the image of the detection surface of the battery cell based on the pulse signal, the method further includes:

[0067] determining a fourth distance between the starting position sensor and the ending position sensor;

[0068] Acquire a scanning error of an image acquisition device;

[0069] A preset row height of the image acquisition device is determined based on the fourth distance, the scanning error and the resolution of the encoder.

[0070] In this way, the image acquisition device can output a complete and accurate battery cell image. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the technical solution 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. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0072] Figure 1 is a schematic diagram of a coating device provided in an embodiment of the present application;

[0073] Figure 2 is a top view of the layout of the coating device provided in an embodiment of the present application;

[0074] Figure 3 This is a schematic diagram of a preset position in a magnetic suspension guide rail provided in an embodiment of the present application;

[0075] Figure 4 It is a schematic diagram of an electrical control architecture provided by an embodiment of the present application;

[0076] Figure 5 The embodiment of the present application provides a pulse generation schematic diagram;

[0077] Figure 6 It is a schematic diagram of the electrical control architecture provided by an embodiment of the present application;

[0078] Figure 7 It is a schematic diagram of the process of the coating method provided in the embodiment of the present application. DETAILED DESCRIPTION

[0079] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0080] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0081] At present, batteries are mainly used in electric vehicles and energy storage systems, and the market size of batteries is huge. Improving battery production efficiency can effectively increase the company's market share and enhance competitiveness. In the battery production process, it is necessary to add battery blue film and Mylar, also known as polyester film, to the battery in the coating and shelling process. The battery blue film is used to separate the battery cells from each other, blocking the impact of various faults on other batteries caused by a single battery cell. Mylar is used to prevent direct contact between bare batteries and battery shells, thereby protecting the battery cells and providing insulation. Due to the damage of the film layer and the metal particles on the surface, the battery pole may be punctured, forming a short circuit and causing the battery to explode and catch fire. Therefore, it is necessary to detect the dirty metal particles on the surface of the film layer and the welding effect of Mylar in the battery shelling process.

[0082] In the related art, the detection method of the cell film layer mainly includes using a line scan camera to collect the image of the cell, and determining whether the film layer has defects based on the collected image. Usually, when it is impossible to collect a complete image of the cell, it will be directly determined that there is a problem with the cell film layer. Among them, the method of collecting the cell image mainly includes placing the cell on a carrier, and the carrier drives the cell to move. During the movement, the grating encoder reader reads the grating scale on the carrier, thereby outputting the corresponding differential pulse to the line scan camera, and the line scan camera collects the image of the cell based on the difference.

[0083] The key point of collecting the cell image in the above method is that the grating encoder can provide a stable and effective pulse signal. Therefore, the installation accuracy requirements for the grating ruler and the reader are relatively high. Usually, the flatness of the installation surface of the reader and the grating ruler is required to be no more than ±1°, and the spacing between the reader and the grating ruler is required to be 1.95±0.15mm. The production line usually includes multiple carriers. During installation and debugging, it is necessary to ensure that the grating ruler on each carrier meets the requirements, which requires a lot of manpower and time and is not easy to achieve. Moreover, during use, because the grating ruler is exposed on site, oil or dust in the equipment in subsequent use may cause the grating ruler to fail, thereby reducing the number of pulses output by the grating ruler, resulting in failure to output the image, making the detection results inaccurate, and affecting the yield of the entire line.

[0084] In order to solve the problems in the prior art, the present application provides a coating device and a coating method. The coating device provided in the present application is first introduced below.

[0085] The coating equipment provided in the embodiment of the present application can be applied to the coating and shelling process in the battery production process.

[0086] See also Figure 1 , is a schematic diagram of the structure of the coating device provided in the embodiment of the present application, such as Figure 1 As shown, the coating device may include: a magnetic drive transport device, an encoder 120 and an image acquisition device 130.

[0087] The magnetic drive conveying device includes: a magnetic suspension mover 111 and a magnetic suspension rail 112. The magnetic suspension mover 111 is used to carry the battery cell 100, and the magnetic suspension rail 112 is used to drive the magnetic suspension mover 111 to convey the battery cell 100 along the conveying direction, so that the battery cell 100 can be moved by the magnetic drive conveying device.

[0088] In this embodiment, the conveying direction can be set according to actual conditions, for example, it can be from left to right, from right to left, from top to bottom, or from bottom to top, etc. This embodiment does not limit this.

[0089] The magnetic suspension rail 112 may include a conveyor line track with magnetism, such as a permanent magnet track or an electromagnetic track, etc. The magnetic suspension mover 111 may include a magnetic carrier, such as a magnetic base or a magnetic vehicle, etc. These magnetic carriers can be driven by the magnetic force on the conveyor line track to achieve contactless suspension movement.

[0090] In this embodiment, the surface of the battery cell 100 is coated with a film layer, and the film layer may include but is not limited to a battery cell blue film and Mylar. The coating equipment can be used in the battery coating and shelling process, and is used to capture images of the battery cell with the surface coated with the battery cell blue film before Mylar coating, and / or capture images of the battery cell with the surface coated with Mylar after Mylar coating.

[0091] For example, see Figure 2 , is a top view of the layout of the coating equipment, such as Figure 2 As shown, the coating system includes a magnetic levitation guide rail 112, and a core loading station A, a Mylar hot melt packaging station B, a glue sticking station C, a shelling station D and a material unloading station E are sequentially arranged around the magnetic levitation guide rail 112 along the conveying direction. When the battery cell 100 moves along the conveying direction on the magnetic levitation guide rail 112, it can pass through the core loading station A, the Mylar hot melt packaging station B, the glue sticking station C, the shelling station D and the material unloading station E in sequence. In order to realize visual inspection of the battery cells 100 transported on the magnetic levitation rail 112, a pre-Mylar packaging visual inspection station F is further provided between the core assembly loading station A and the Mylar packaging hot melt station B. The pre-Mylar packaging visual inspection station F includes two image acquisition devices 130 arranged opposite to each other on both sides of the magnetic levitation rail 112. A post-Mylar packaging visual inspection station G is further provided between the gluing station C and the shelling station D. The post-Mylar packaging visual inspection station G also includes two image acquisition devices 130 arranged opposite to each other on both sides of the magnetic levitation rail 112. Thus, in the film coating process, when the battery cell 100 passes through the visual inspection station F before Mylar coating, the two image acquisition devices 130 set at the visual inspection station F before Mylar coating can be used to capture images of the two surfaces of the battery cell 100 in the first direction, where the first direction is perpendicular to the conveying direction, thereby obtaining a first surface image of the battery cell 100 before Mylar coating. Thus, based on the first surface image, the blue film surface of the battery cell 100 before Mylar coating can be inspected for defects. When the battery cell 100 passes through the visual inspection station G after Mylar coating, the two image acquisition devices 130 set at the visual inspection station G after Mylar coating can be used to capture images of the two surfaces of the battery cell 100 in the first direction, thereby obtaining a second surface image of the battery cell 100 after Mylar coating. Thus, based on the captured second surface image, the Mylar surface coated on the surface of the battery cell 100 can be inspected for defects.

[0092] Furthermore, the magnetic suspension guide rail 112 is provided with a plurality of preset positions along the conveying direction, and each preset position has a known fixed coordinate.

[0093] In this embodiment, the magnetic suspension rail 112 may include a plurality of magnetic suspension stators arranged in sequence along the conveying direction. When the magnetic drive conveying device is in operation, the magnetic suspension stators may generate a set of alternating magnetic fields on the surface of the magnetic suspension rail 112, thereby driving the magnetic suspension movers on the magnetic suspension rail 112 to move at high speed, thereby realizing the transfer and conveying of materials on the production line. Figure 3 As shown, taking the direction from right to left as the conveying direction as an example, the magnetic levitation guide rail 112 may include a plurality of magnetic levitation stators 0-N arranged in sequence along the conveying direction, a preset position is respectively set at the same position of each magnetic levitation stator, and the right edge of the magnetic levitation stator ranked first in the conveying direction corresponds to the coordinate point 0. Assuming that the size of each magnetic levitation stator is 500mm, a preset position is respectively set at a position 20mm away from the right edge of each magnetic levitation stator, then the coordinate of the preset position in the first magnetic levitation stator is 20mm, and the coordinate of the preset position in the second magnetic levitation stator is 500mm+20mm, and so on, the coordinates corresponding to each preset position can be determined respectively.

[0094] The magnetic levitation conveying device also includes a position detection module 113 , which is used to determine the position of the magnetic levitation mover 111 based on a plurality of preset positions on the magnetic levitation guide rail 112 during the process of the magnetic levitation conveying device conveying the battery core 100 .

[0095] In this embodiment, the battery cell 100 is placed on the magnetic suspension mover 111 and moves with the movement of the magnetic suspension mover 111, so the position of the magnetic suspension mover 111 can be used as the position of the battery cell 100. The magnetic suspension mover 111 is suspended and moved along the conveying direction on the magnetic suspension rail 112. During the movement, the change of the position of the vertical projection point of the magnetic suspension mover 111 on the magnetic suspension rail 112 can reflect the change of the magnetic suspension mover 111 in the conveying direction, so the position of the vertical projection point of the magnetic suspension mover 111 on the magnetic suspension rail 112 can be used as the position of the magnetic suspension mover 111. Based on this, a plurality of preset positions are set on the magnetic suspension rail 112 along the conveying direction, and the position detection module 113 can determine the corresponding position of the vertical projection point of the magnetic suspension mover 111 on the magnetic suspension rail 112 based on the plurality of preset positions, that is, determine the position of the magnetic suspension mover 111.

[0096] The position detection module 113 is further used to send the position of the magnetic suspension mover 111 to the encoder 120 .

[0097] The encoder 120 is used to generate a pulse signal based on the position of the magnetic suspension mover 111 and send the pulse signal to the image acquisition device 130 .

[0098] The image acquisition device 130 is used to acquire an image of the battery cell 100 based on the pulse signal.

[0099] In this embodiment, the image acquisition device 130 may include a high-speed image acquisition device such as a line scan camera. The image acquisition device 130 is used to capture images of the battery cell 100 when the magnetic drive conveying device drives the battery cell 100 to move. In order to capture a complete battery cell image during the movement of the battery cell 100, the position of the magnetic suspension mover 111 is obtained by the position detection module 113 in the magnetic suspension conveying device during the movement of the battery cell 100, and the position is transmitted to the encoder 120 as the position of the battery cell 100, so that the encoder 120 controls the image acquisition device 130 based on the position of the battery cell 100 to scan the battery cell 100 at a high speed at a certain frequency, so as to capture a complete battery cell image.

[0100] The coating equipment provided in the embodiment of the present application uses a magnetic drive conveying device to drive the battery cell 100 to move. During the movement of the battery cell 100, the position of the magnetic suspension mover 111 is determined based on the preset position in the magnetic suspension guide rail 112, and the position of the magnetic suspension mover 111 is transmitted to the encoder 120 as the position of the battery cell 100, so that the encoder 120 outputs a pulse signal based on the position change of the magnetic suspension mover 111 to trigger the image acquisition device 130 to capture the image of the battery cell 100. Compared with the traditional method of controlling the line scan camera to capture the image of the battery cell based on the grating ruler and grating encoder, the solution provided in the embodiment of the present application has lower installation accuracy requirements, is easier to implement, and is less affected by the environment, making the output image more accurate.

[0101] In some embodiments, the position detection module 113 may include a controller 1131 and a plurality of position sensors arranged in sequence along the magnetic levitation guide rail, wherein the plurality of position sensors correspond one-to-one to a plurality of preset positions in the magnetic levitation guide rail 112, that is, one position sensor corresponds to one preset position. The position sensor is used to send a sensing signal to the controller when sensing the magnetic levitation mover 111; the controller 1131 is used to use the preset position corresponding to the last received sensing signal as the position of the magnetic levitation mover 111, and to send the position of the magnetic levitation mover 111 to the encoder 120. The preset position corresponding to the sensing signal is the preset position corresponding to the position sensor that sends the sensing signal.

[0102] In this embodiment, the controller 1131 can be connected to the encoder 120 for communication, and send the position of the magnetic suspension mover 111 to the encoder 120 through the communication interface. Figure 4As shown, the controller 1131 can be connected to the encoder 120 for communication using the communication interface RS485.

[0103] In this embodiment, the position sensor can be a proximity position sensor. For each position sensor, when the magnetic levitation mover 111 approaches a set distance from the position sensor, the position sensor can send an "action" signal, that is, an induction signal. In this way, after receiving the induction signal sent by the position sensor, the controller 1131 can determine that the position of the magnetic levitation mover 111 is close to the position of the position sensor. Based on this, the controller 1131 can determine the preset position corresponding to the magnetic levitation mover 111 based on the received induction signal, and then determine the position of the magnetic levitation mover.

[0104] Through the above method, the position of the magnetic suspension mover can be detected.

[0105] In some embodiments, the image acquisition device 130 is disposed on the side of the magnetic drive conveying device, and the optical axis of the image acquisition device 130 is perpendicular to and intersects with the detection surface of the battery cell 100. The detection surface of the battery cell 100 refers to the surface of the battery cell 100 that needs to be imaged, and the detection surface of the battery cell 100 can be specified according to actual conditions, and one battery cell 100 can include one or more detection surfaces.

[0106] The multiple position sensors of the position detection module 113 include a starting position sensor and an end position sensor. The starting position sensor is installed at a first preset position of the magnetic levitation guide rail, the first preset position is on the upstream side of the image acquisition position, and the distance between the starting position and the image acquisition position is a first distance. The end position sensor is installed at a second preset position of the magnetic levitation guide rail, the second preset position is on the downstream side of the image acquisition position, and the distance between the end position and the image acquisition position is a second distance, and the second distance is greater than or equal to the length of the detection surface of the battery cell, wherein the image acquisition position is the position where the parallel line of the magnetic levitation guide rail and the optical axis of the image acquisition device intersect.

[0107] In this embodiment, the specific values ​​of the first distance and the second distance can be set according to actual conditions. For example, the first distance can be 10 mm, and the second distance can be the size of a magnetic levitation mover 111 plus 10 mm, where the size of the magnetic levitation mover 111 is greater than or equal to the length of the detection surface of the battery cell 100. In addition to the above values, the first distance and the second distance can also be other values, and this embodiment does not specifically limit this.

[0108] Based on the above settings, the controller 1131 sends the position of the magnetic levitation mover 111 to the encoder 120, which may include: starting from receiving the induction signal sent by the starting position sensor, sending the position of the magnetic levitation mover to the encoder once in each preset time period, until receiving the induction signal sent by the end position sensor and stopping sending.

[0109] In this embodiment, the preset time period can be set in the controller 1131 through the controller software according to actual conditions. For example, the preset time period can be set to 1ms or other time lengths, which is not specifically limited in this embodiment.

[0110] For example, see Figure 5 ,by Figure 5 The coordinate point 0 in the figure is the first preset position, and the position of +16mm is the second preset position. When the magnetic levitation mover 111 moves to the right from the position of -16mm, after passing the coordinate point 0, the controller 1131 collects the position of the magnetic levitation mover 111 with a preset time period of 1ms, and transmits the position to the encoder 120. The encoder 120 outputs pulses based on the position of the magnetic levitation mover 111. When the magnetic levitation mover 111 reaches the position of +16mm, the controller 1131 no longer collects the position of the magnetic levitation mover 111, and the encoder 120 also stops outputting pulses. There can be at most one magnetic levitation mover 111 between the first preset position and the second preset position at any time.

[0111] In this embodiment, the encoder 120 generates a pulse signal based on the position of the magnetic levitation mover 111 sent by the controller 1131. In this way, the encoder 120 can output a pulse signal to the image acquisition device 130 from the time the magnetic levitation mover 111 reaches the first preset position until the magnetic levitation mover 111 reaches the second preset position. That is, the encoder 120 outputs a pulse signal when the magnetic levitation mover 111 passes through the image acquisition device 130, so that the image acquisition device 130 can capture a complete image of the battery cell 100 during the movement of the magnetic levitation mover 111.

[0112] In some embodiments, the encoder 120 can determine the displacement of the magnetic levitation mover 111 based on the received position of the magnetic levitation mover 111 in each preset time period, take the ratio of the displacement to the resolution of the encoder as the number of pulses, and generate a pulse signal corresponding to the number of pulses, thereby controlling the image acquisition device 130 to perform image acquisition based on the pulse signal.

[0113] In this embodiment, the displacement of the magnetic levitation mover 111 can be regarded as the displacement of the battery cell 100. In this way, through the above method, a pulse signal corresponding to the displacement change of the battery cell 100 can be obtained in each preset time period, so that the image acquisition device 130 can be controlled by the pulse signal to capture images of the battery cell 100 at a certain frequency.

[0114] In some embodiments of the present application, the encoder 120 may use differential transmission to send a pulse signal to the image acquisition device 130. In this way, the anti-interference capability of the pulse signal may be improved.

[0115] In some embodiments, an acquisition card 140 may be further included between the encoder 120 and the image acquisition device 130. Figure 6 As shown, the encoder 120 can convert the pulse signal into differential signals A+ and A-, and then transmit A+ and A- to the acquisition card 140 of the image acquisition device 130, and then control the image acquisition device 130 to perform image acquisition through the acquisition card 140. By setting the acquisition card 140, the transmission quality of the image acquisition device 130 can be improved and the transmission speed can be maximized.

[0116] In some embodiments, when sending the position of the magnetic levitation mover 111 to the encoder 120 , the controller 1131 may also first calculate the position of the magnetic levitation mover 111 based on a preset verification algorithm to obtain a first verification code, and then send the position of the magnetic levitation mover 111 and the first verification code to the encoder 120 .

[0117] Accordingly, when the encoder 120 generates a pulse signal based on the received position of the magnetic levitation mover 111, it can first calculate the received position of the magnetic levitation mover 111 based on a preset verification algorithm to obtain a second verification code, and compare the second verification code with the received first verification code. When the second verification code is consistent with the first verification code, a pulse signal is generated based on the position of the magnetic levitation mover 111.

[0118] The controller 1131 and the encoder 120 use the same verification algorithm, which may include a modbus rtu crc algorithm, etc. This embodiment does not specifically limit this.

[0119] In this way, the accuracy and integrity of the position of the magnetic suspension mover 111 can be improved.

[0120] In some embodiments, the image acquisition device 130 may include a line scan camera, which is characterized by being able to perform high-speed line-by-line scanning at a certain frequency to ultimately form a complete image. Based on this, when the image acquisition device 130 performs image acquisition based on a pulse signal, it can acquire a line of image for each pulse received, and when the line height of the acquired image is equal to the preset line height, the acquired images are combined into one image, and the combined image is used as the image of the detection surface of the battery cell 100.

[0121] In this embodiment, the preset row height n can be calculated according to the distance between the first preset position and the second preset position, the scanning cycle error, and the resolution of the encoder 120 according to the following formula:

[0122] n=(the distance between the first preset position and the second preset position - the scanning cycle error) / the resolution of the encoder.

[0123] The scanning cycle error may be a ratio of the moving speed V1 of the magnetic suspension mover 111 to a preset time period.

[0124] In this way, the image acquisition device 130 can output a complete image of the detection surface of the battery cell 100 when the magnetic suspension mover 111 moves based on the pulse signal output by the encoder 120 and the preset line height. The image output is stable and the object detected by the image acquisition device 130 completely corresponds to the actual measurement object, which is conducive to accurate calibration of the data.

[0125] Data Validation:

[0126] Taking the image acquisition device as a line scan camera as an example, the position 10mm upstream of the line scan camera in the magnetic levitation guide rail is set as the first preset position A corresponding to the starting position sensor through the magnetic drive coordinates, and the corresponding point after a complete magnetic levitation mover passes through the line scan camera is used as the second preset position B corresponding to the end position sensor. The distance between the two positions A and B is 570mm. The actual accuracy of the differential signal output by the encoder, that is, the A+ signal and the A- signal, is 8μ. Theoretically, when the magnetic levitation mover moves between the two positions A and B, the encoder can send 71250 pulses. In fact, through the acquisition card software detection, the number of pulses received is 71248, and the error value is less than 0.1%. At the same distance, the test found that the actual pulse number error value is within 0.1% when the magnetic levitation mover moves at different speeds. This error has no effect on the line scan camera output. It can be seen that through the output pulses when the magnetic levitation mover passes through the line scan camera, combined with the preset line height set in the line scan camera system, the line scan camera can capture the surface of the battery cell when the mover moves. The image output is stable and the camera detection object completely corresponds to the actual measurement object, which is conducive to the accurate calibration of the data, so that defective products in the battery cell can be accurately detected based on the images captured by the line scan camera.

[0127] According to some embodiments of the present application, a spot inspection method for coating equipment is provided.

[0128] See also Figure 7 , is a schematic diagram of a coating method according to some embodiments of the present application, such as Figure 7 As shown, the method may include the following steps:

[0129] S71. Placing the battery cell on the magnetic suspension mover, wherein the surface of the battery cell is coated with a film layer;

[0130] S72. Drive the magnetic suspension mover to transport the battery cell along the transport direction through the magnetic suspension rail;

[0131] S73. In the process of the magnetic levitation mover conveying the battery core, the position of the magnetic levitation mover is determined based on a plurality of preset positions in the magnetic levitation guide rail by the position detection module, and the position of the magnetic levitation mover is sent to the encoder;

[0132] S74. The encoder generates a pulse signal based on the position of the magnetic suspension mover and sends the pulse signal to the image acquisition device;

[0133] S75. The image acquisition device acquires an image of the battery cell based on the pulse signal.

[0134] A magnetic drive conveying device is used to drive the battery cell to move. During the movement of the battery cell, the position of the magnetic suspension mover is determined based on the preset position in the magnetic suspension guide rail, and the position of the magnetic suspension mover is transmitted to the encoder as the position of the battery cell, so that the encoder outputs a pulse signal based on the position change of the magnetic suspension mover to trigger the image acquisition device to capture the image of the battery cell. Compared with the traditional method of controlling the line scan camera to capture the image of the battery cell based on the grating ruler and grating encoder, the solution provided in the embodiment of the present application has lower installation accuracy requirements, is easier to implement, and is less affected by the environment, making the output image more accurate, thereby improving the accuracy of battery cell inspection.

[0135] According to some embodiments of the present application, the position detection module includes a controller and a plurality of position sensors sequentially arranged along the magnetic suspension rail, the plurality of position sensors corresponding one-to-one to a plurality of preset positions in the magnetic suspension rail, and the position sensor is used to send an induction signal when sensing the magnetic suspension mover;

[0136] The position of the magnetic suspension mover is determined based on a plurality of preset positions in the magnetic suspension guide rail by a position detection module, including:

[0137] The controller uses the preset position corresponding to the last received induction signal as the position of the magnetic suspension mover, and the preset position corresponding to the induction signal is the preset position corresponding to the position sensor that sends the induction signal.

[0138] Through the above method, the position of the magnetic suspension mover can be detected.

[0139] According to some embodiments of the present application, the plurality of position sensors include a starting position sensor and an end position sensor, and send the position of the magnetic suspension mover to the encoder, including:

[0140] Starting from receiving the induction signal sent by the starting position sensor, the position of the magnetic suspension mover is sent to the encoder once in each preset time period until the induction signal sent by the end position sensor is received.

[0141] In this way, the encoder can output a pulse signal to the image acquisition device from the time the magnetic levitation mover reaches the first preset position until the magnetic levitation mover reaches the second preset position. That is, through the pulse signal output by the encoder when the magnetic levitation mover passes through the image acquisition device, the image acquisition device can capture a complete image of the battery cell during the movement of the magnetic levitation mover.

[0142] According to some embodiments of the present application, the encoder generates a pulse signal based on the position of the magnetic suspension mover, including:

[0143] Determine the displacement of the magnetic suspension mover based on the position of the magnetic suspension mover in each preset time period;

[0144] The ratio of displacement to encoder resolution is taken as the number of pulses;

[0145] Generate a pulse signal corresponding to the number of pulses.

[0146] In this way, a pulse signal corresponding to the displacement change of the battery cell can be obtained in each preset time period, so that the image acquisition device is controlled by the pulse signal to acquire images of the battery cell at a certain frequency.

[0147] According to some embodiments of the present application, sending a pulse signal to an image acquisition device includes:

[0148] The pulse signal is sent to the image acquisition device by differential transmission.

[0149] In this way, the anti-interference ability of the pulse signal can be improved.

[0150] According to some embodiments of the present application, sending the position of the magnetic suspension mover to an encoder includes:

[0151] The position detection module calculates the position of the magnetic suspension mover based on a preset verification algorithm to obtain a first verification code;

[0152] Sending the position of the magnetic suspension mover and the first check code to the encoder;

[0153] The encoder generates pulse signals based on the position of the magnetically suspended mover, including:

[0154] The encoder calculates the received position of the magnetic suspension mover based on the verification algorithm to obtain a second verification code;

[0155] comparing the second check code with the received first check code;

[0156] When the second check code is consistent with the first check code, a pulse signal is generated based on the position of the magnetic suspension mover.

[0157] In this way, the accuracy and integrity of the position of the magnetic suspension mover can be improved.

[0158] According to some embodiments of the present application, the image acquisition device includes a line scan camera, and the image acquisition device acquires an image of a detection surface of a battery cell based on a pulse signal, including:

[0159] The image acquisition device acquires a line of image each time it receives a pulse;

[0160] When the row height of the collected images is equal to the preset row height, the collected images are combined into one image;

[0161] The composed image is used as the image of the detection surface of the battery cell.

[0162] In this way, through the pulse signal output by the encoder when the magnetic levitation mover passes through the image acquisition device, combined with the preset line height, the image acquisition device 130 outputs a complete image of the detection surface of the battery cell 100 when the magnetic levitation mover 111 moves. The image output is stable and the object detected by the image acquisition device 130 completely corresponds to the actual measurement object, which is conducive to accurate calibration of the data.

[0163] According to some embodiments of the present application, before the image acquisition device acquires the image of the detection surface of the battery cell based on the pulse signal, the method further includes:

[0164] determining a fourth distance between the starting position sensor and the ending position sensor;

[0165] Acquire a scanning error of an image acquisition device;

[0166] A preset row height of the image acquisition device is determined based on the fourth distance, the scanning error and the resolution of the encoder.

[0167] In this way, the image acquisition device can output a complete and accurate battery cell image.

[0168] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0169] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0170] Aspects of the present disclosure are described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0171] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A coating device, characterized in that: include: Magnetic drive conveying device, encoder and image acquisition device; The magnetic drive conveying device comprises: a magnetic suspension mover, a magnetic suspension guide rail and a position detection module; The magnetic suspension mover is used to carry the battery core, and the surface of the battery core is coated with a film layer; The magnetic suspension guide rail is used to drive the magnetic suspension mover to transport the battery core along a transport direction; The magnetic suspension guide rail is provided with a plurality of preset positions along the conveying direction; The position detection module is used to determine the position of the magnetic suspension mover based on the multiple preset positions during the process of the magnetic drive conveying device conveying the battery core, and send the position of the magnetic suspension mover to the encoder; The encoder is used to generate a pulse signal based on the position of the magnetic suspension mover, and send the pulse signal to the image acquisition device; The image acquisition device is used to acquire the image of the battery cell based on the pulse signal; Around the magnetic suspension guide rail, a core loading station, a visual inspection station before Mylar wrapping, a Mylar hot-melt station, a visual inspection station after Mylar wrapping, a gluing station, a shelling station and a material unloading station are sequentially arranged along the conveying direction; The image acquisition device is arranged at the visual inspection station before the Mylar package and the visual inspection station after the Mylar package.

2. The device according to claim 1, characterized in that The position detection module includes a controller and a plurality of position sensors sequentially arranged along the magnetic suspension rail, wherein the plurality of position sensors correspond one to one with a plurality of preset positions of the magnetic suspension rail; The position sensor is used to send a sensing signal to the controller when sensing the magnetic suspension mover; The controller is used to use the preset position corresponding to the last received induction signal as the position of the magnetic levitation mover, and send the position of the magnetic levitation mover to the encoder. The preset position corresponding to the induction signal is the preset position corresponding to the position sensor that sends the induction signal.

3. The device according to claim 2, characterized in that The image acquisition device is arranged on the side of the magnetic drive conveying device, and the optical axis of the image acquisition device is perpendicular to and intersects with the detection surface of the battery core; The plurality of position sensors include a starting position sensor and an end position sensor; The starting position sensor is installed at a first preset position of the magnetic suspension guide rail, the first preset position is on the upstream side of the image acquisition position, and the distance between the first preset position and the image acquisition position is a first distance, and the image acquisition position is the position where the magnetic suspension guide rail and the parallel line of the optical axis of the image acquisition device intersect; The end position sensor is installed at a second preset position of the magnetic suspension guide rail, the second preset position is on the downstream side of the image acquisition position, and the distance between the second preset position and the image acquisition position is a second distance, and the second distance is greater than or equal to the length of the detection surface of the battery cell; The controller is further used to send the position of the magnetic suspension mover to the encoder once in each preset time period starting from receiving the sensing signal sent by the starting position sensor until receiving the sensing signal sent by the end position sensor.

4. The device according to claim 3, characterized in that The encoder is also used to determine the displacement of the magnetic levitation mover based on the received position of the magnetic levitation mover in each preset time period, take the ratio of the displacement to the resolution of the encoder as the number of pulses, and generate a pulse signal corresponding to the number of pulses.

5. The device according to any one of claims 2 to 4, characterized in that: The controller is further configured to calculate the position of the magnetic suspension mover based on a preset verification algorithm to obtain a first verification code, and send the position of the magnetic suspension mover and the first verification code to an encoder; The encoder is also used to: calculate the received position of the magnetic levitation mover based on the verification algorithm to obtain a second verification code, compare the second verification code with the received first verification code, and generate a pulse signal based on the position of the magnetic levitation mover when the second verification code is consistent with the first verification code.

6. The device according to any one of claims 1 to 4, characterized in that: The image acquisition device includes a line scan camera; The image acquisition device is also used to acquire a line of image each time a pulse is received. When the line height of the acquired image is equal to the preset line height, the acquired images are combined into one image, and the combined image is used as the image of the detection surface of the battery cell.

7. A coating method, characterized in that: The method comprises: Placing a battery core on a magnetic suspension mover, wherein the surface of the battery core is coated with a film layer; The magnetic suspension mover is driven by a magnetic suspension guide rail to transport the battery cell along a transport direction; In the process of the magnetic suspension mover conveying the battery core, the position of the magnetic suspension mover is determined based on a plurality of preset positions in the magnetic suspension guide rail by a position detection module, and the position of the magnetic suspension mover is sent to an encoder; The encoder generates a pulse signal based on the position of the magnetic suspension mover, and sends the pulse signal to an image acquisition device; The image acquisition device acquires an image of the battery cell based on the pulse signal; Around the magnetic suspension guide rail, a core loading station, a visual inspection station before Mylar wrapping, a Mylar hot-melt station, a visual inspection station after Mylar wrapping, a gluing station, a shelling station and a material unloading station are sequentially arranged along the conveying direction; The image acquisition device is arranged at the visual inspection station before the Mylar package and the visual inspection station after the Mylar package.

8. The method according to claim 7, characterized in that The position detection module includes a controller and a plurality of position sensors sequentially arranged along the magnetic suspension guide rail, wherein the plurality of position sensors correspond one-to-one to a plurality of preset positions in the magnetic suspension guide rail, and the position sensor is used to send an induction signal when sensing the magnetic suspension mover; The determining the position of the magnetic suspension mover based on a plurality of preset positions in the magnetic suspension guide rail by a position detection module includes: The controller uses the preset position corresponding to the last received induction signal as the position of the magnetic suspension mover, and the preset position corresponding to the induction signal is the preset position corresponding to the position sensor that sends the induction signal.

9. The method according to claim 8, characterized in that The plurality of position sensors include a starting position sensor and an end position sensor, and the step of sending the position of the magnetic suspension mover to the encoder includes: Starting from receiving the sensing signal sent by the starting position sensor, the position of the magnetic suspension mover is sent to the encoder once in each preset time period until the sensing signal sent by the end position sensor is received.

10. The method according to claim 9, characterized in that The encoder generates a pulse signal based on the position of the magnetic suspension mover, including: Determining the displacement of the magnetic suspension mover based on the position of the magnetic suspension mover in each of the preset time periods; Taking the ratio of the displacement to the resolution of the encoder as the number of pulses; A pulse signal corresponding to the number of pulses is generated.

11. The method according to any one of claims 7 to 10, characterized in that: The step of sending the pulse signal to an image acquisition device comprises: The pulse signal is sent to the image acquisition device in a differential transmission manner.

12. The method according to any one of claims 7 to 10, characterized in that: The sending the position of the magnetic suspension mover to the encoder comprises: The position detection module calculates the position of the magnetic suspension mover based on a preset verification algorithm to obtain a first verification code; Sending the position of the magnetic suspension mover and the first check code to an encoder; The encoder generates a pulse signal based on the position of the magnetic suspension mover, including: The encoder calculates the received position of the magnetic suspension mover based on the verification algorithm to obtain a second verification code; Comparing the second verification code with the received first verification code; When the second check code is consistent with the first check code, a pulse signal is generated based on the position of the magnetic levitation mover.

13. The method according to any one of claims 7 to 10, characterized in that: The image acquisition device includes a line scan camera, and the image acquisition device acquires an image of the detection surface of the battery cell based on the pulse signal, including: The image acquisition device acquires a line of image each time a pulse is received; When the row height of the collected images is equal to the preset row height, the collected images are combined into one image; The composed image is used as the image of the detection surface of the battery cell.

14. The method according to any one of claims 9 to 10, characterized in that: Before the image acquisition device acquires the image of the detection surface of the battery cell based on the pulse signal, the method further includes: determining a fourth distance between the starting position sensor and the ending position sensor; Acquiring a scanning error of the image acquisition device; A preset row height of the image acquisition device is determined based on the fourth distance, the scanning error, and a resolution of the encoder.

Images