Battery cell winding and discharging deviation compensation method and device

Abstract

The invention discloses a battery cell winding and discharging deviation compensation method and device, and relates to the technical field of battery cell processing. Comprising the following steps: transferring a wound battery cell to a hole ironing station through a transfer device to finish the hole ironing of a pole diaphragm; transferring the hole-ironed battery cell to an unloading setting platform, and obtaining the position offset of the two sides of the battery cell relative to an unloading conveying line through a visual detection device; a deviation correction compensation value is calculated based on the position offset, a control signal is generated, a deviation correction execution mechanism is driven to adjust the position of the discharging setting platform, and the battery cells are in central symmetry relative to the discharging conveying line; the unloading setting platform is controlled to descend to an unloading conveying line, and the conveying of the battery cell and the subsequent end face rubbing and leveling process are completed; and in the process that the unloading setting platform returns to the material receiving position, the clamping groove supporting position is self-set, and symmetry with the unloading conveying line is kept. The invention aims to effectively control the position offset of a roll core in the production process of the battery core and ensure the stress uniformity in the flattening and leveling processes.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell processing, and particularly relates to a method and device for compensating for deviation in the winding and unloading of battery cells. Background Art

[0002] In the production process of lithium batteries, the winding process is a core link in the preparation of battery cells, and its quality directly affects the overall performance and stability of the battery. During the transfer of cylindrical battery cores, due to the influence of gripper operations, the inner and outer layer materials of the battery core may shift in position. Under the treatment of the hole punching process, due to uneven operations, the surface of the battery core may deform. In this way, the force-bearing conditions on both sides of the battery core are often asymmetric during the subsequent end face flattening and patting processes, resulting in non-uniform deformation of the two end faces when stressed, and thus causing secondary bending of the tabs during the forming process. This bending usually shows a radioactive misalignment towards the central area of the battery core, causing the tabs to wrinkle and skew, affecting the normal use of the battery, and even potentially leading to safety hazards such as battery short circuits and overheating.

[0003] Therefore, how to effectively control the position deviation of the battery core during the production process of the battery cell and ensure the uniformity of the force-bearing during the flattening and patting processes has become a technical problem to be solved urgently. Summary of the Invention

[0004] The main object of the present invention is to provide a method and device for compensating for deviation in the winding and unloading of battery cells, aiming to effectively control the position deviation of the battery core during the production process of the battery cell and ensure the uniformity of the force-bearing during the flattening and patting processes.

[0005] To achieve the above object, the present invention proposes a method for compensating for deviation in the winding and unloading of battery cells, including the following steps: (1) Transfer the wound battery cell to the hole punching station through a transfer device to complete the hole punching of the pole column diaphragm; (2) Transfer the battery cell after hole punching to the unloading setting platform, and obtain the position deviation amount of both sides of the battery cell relative to the unloading conveyor line through a vision detection device; (3) Calculate the deviation compensation value based on the position deviation amount, generate a control signal, and drive the deviation correction actuator to adjust the position of the unloading setting platform to make the battery cell symmetric with respect to the center of the unloading conveyor line; (4) Control the unloading setting platform to descend to the unloading conveyor line to complete the conveying of the battery cell and the subsequent end face flattening and patting processes; (5) During the process of the unloading setting platform returning to the material receiving position, perform self-calibration on its slot support position to maintain symmetry with the unloading conveyor line.

[0006] Through precise visual detection, compensation control, and servo drive adjustment, it is possible to effectively correct the position offset of the battery cell during the winding and punching processes. This method can ensure the accurate alignment of the battery cell during the unloading process, thereby guaranteeing the uniformity of the subsequent end-face flattening and patting processes. By improving the force consistency on both sides of the battery cell, the inconsistent bending of the tabs is reduced, significantly enhancing the qualified rate of the battery.

[0007] In an embodiment of the present application, the visual detection device includes CCD area array cameras arranged on both sides of the battery cell, which are used to capture the distance between the edge of the battery cell separator and the edge of the slot of the unloading setting platform.

[0008] By arranging CCD area array cameras on both sides of the battery cell, it is possible to accurately measure the distance between the edge of the battery cell separator and the edge of the slot of the unloading setting platform, thereby effectively determining the offset amount of the battery cell. The precise measurement of this visual detection device and the subsequent compensation control can ensure the accurate position of the battery cell during the entire unloading process.

[0009] In an embodiment of the present application, the calculation logic of the deviation correction compensation value is as follows: Obtain the inner distance M and the outer distance N of the battery cell through visual detection; Calculate the deviation correction median value T = (M + N) / 2; Determine the deviation correction direction and compensation amount according to the inner offset amount i = M - T.

[0010] By obtaining the distance data on the inner and outer sides through the visual detection device, calculating the deviation correction median value T, and accurately judging the deviation correction direction and compensation amount according to the inner offset amount i, it is possible to precisely control the position adjustment of the battery cell.

[0011] In an embodiment of the present application, the control signal is transmitted through the communication link between the PLC and the servo driver, and the communication link includes at least one of Ethernet and EtherCAT protocol.

[0012] Through the communication link (including Ethernet and EtherCAT protocol) between the PLC and the servo driver, it is possible to achieve precise control signal transmission, ensuring the real-time performance of the battery cell deviation correction process.

[0013] In an embodiment of the present application, the deviation correction actuator includes a Y-direction servo module, which is used to drive the slot bracket of the unloading setting platform to move perpendicular to the conveying direction.

[0014] By precisely controlling the movement of the slot bracket of the unloading setting platform through the Y-direction servo module, it is possible to effectively adjust the position of the battery cell, ensure the symmetry of the battery cell with the unloading conveyor line, and thus guarantee the accuracy of the subsequent processes of the battery cell. The precise adjustment of the Y-direction servo module improves the flexibility and accuracy of the deviation correction process.

[0015] In an embodiment of the present application, the lifting of the unloading and setting platform is realized by a Z-direction servo motor driving a lead screw module.

[0016] Precise lifting control is carried out by a Z-direction servo motor driving a lead screw module, which can ensure the vertical movement accuracy and stability of the unloading and setting platform. This technical solution makes the up and down movement process of the battery cell stable and accurate, avoiding the position deviation of the battery cell caused by unbalanced or inaccurate lifting.

[0017] In an embodiment of the present application, the distance between the clamping groove brackets of the unloading and setting platform is larger than the distance between the unloading conveyor lines by A, where A ≥ 20 mm, and the distance reserved on both sides is A / 2.

[0018] Through the adjustment function of the distance between the clamping groove brackets of the unloading and setting platform, it can effectively cope with the small position offset of the battery cell during transportation.

[0019] In an embodiment of the present application, the vision detection device further includes an infrared dot matrix bar light source for enhancing the imaging contrast of the edge of the diaphragm.

[0020] By adding an infrared dot matrix bar light source to the vision detection device, the imaging contrast of the edge of the diaphragm can be effectively improved. By enhancing the contrast, the system can more clearly identify the distance between the edge of the diaphragm of the battery cell and the edge of the clamping groove, significantly improving the accuracy and reliability of vision detection. It ensures that the measurement of the offset of the battery cell is more accurate, thereby improving the accuracy of the deviation correction process and avoiding problems such as uneven stress caused by offset and inconsistent bending of the tabs.

[0021] The present application also discloses a device for compensating the deviation of the battery cell winding and unloading, including: A transfer module configured to transfer the wound battery cell to the hole punching station and the unloading and setting platform; A vision detection module provided on both sides of the unloading and setting platform for obtaining the position offset of both sides of the battery cell relative to the unloading conveyor line; A deviation correction control module communicatively connected to the vision detection module, generating a deviation correction control signal based on the position offset; An unloading and setting platform equipped with a Y-direction servo deviation correction module, receiving the deviation correction control signal and adjusting the position of the battery cell to be centrally symmetric; A lifting drive module for driving the unloading and setting platform to lift in the Z direction and transferring the deviation-corrected battery cell to the unloading conveyor line; A conveyor line module including a grooved unloading conveyor line for receiving the battery cell and transporting it to the flattening and patting station; and A self-tuning mechanism configured to reset the position of its clamping groove support when the unloading and setting platform returns to the receiving position, maintaining symmetry with the conveyor line.

[0022] Through precise visual detection, deviation correction control, and servo drive systems, the offset problem of the battery cell during the unloading process is effectively compensated. The visual detection module, through the cooperation of two groups of CCD area array cameras and an infrared dot matrix bar light source, can provide clear and accurate image data, enabling the deviation correction control module to precisely adjust the position of the battery cell and ensure that the battery cell is always in the central symmetric position of the unloading conveyor line. The precise adjustment of the Y-direction servo deviation correction module and the stable control of the lifting drive module enable the battery cell to smoothly enter the subsequent processes and ensure that the two sides of the battery cell are evenly stressed during the flattening and patting processes.

[0023] In an embodiment of the present application, the visual detection module includes: Two groups of CCD area array cameras, corresponding to the inner and outer sides of the battery cell respectively; An infrared dot matrix bar light source, arranged within the camera's field of view to enhance the imaging of the diaphragm edge.

[0024] By setting two groups of CCD area array cameras and an infrared dot matrix bar light source, the visual detection module can provide high-contrast and clear images of the battery cell, ensuring high precision and high reliability during the detection process.

[0025] Adopting the above technical solution, through precise visual detection, compensation control, and servo drive adjustment, the position offset of the battery cell during winding and punching can be effectively corrected. This method can ensure the accurate alignment of the battery cell during the unloading process, and further guarantee the uniformity of the subsequent end-face flattening and patting processes. By improving the consistency of the forces on both sides of the battery cell, the inconsistent bending of the tabs is reduced, significantly improving the qualified rate of the battery. Brief Description of the Drawings

[0026] The present invention will be described in detail below in conjunction with specific embodiments and drawings, where: Figure 1 is the schematic flow structure diagram of the first embodiment of the present invention; Figure 2 is the schematic structure diagram of the battery cell winding unloading deviation compensation device; 10. Transfer module; 20. Visual detection module; 30. Deviation correction control module; 40. Lifting drive module; 50. Conveyor line module. Detailed Description of the Embodiment

[0027] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not limit the present invention.

[0028] As Figure 1 shown, in order to achieve the above objectives, the present invention proposes a method for compensating for the deviation of the battery cell winding unloading, including the following steps: (1)Transfer the wound battery cell to the hole-punching station through a transfer device to complete the hole-punching of the pole column diaphragm; (2)Transfer the battery cell after hole-punching to the unloading and alignment platform, and obtain the position offset of both sides of the battery cell relative to the unloading conveyor line through a vision detection device; (3)Calculate the deviation compensation value based on the position offset, generate a control signal and drive the deviation correction actuator to adjust the position of the unloading and alignment platform, so that the battery cell is symmetrically centered relative to the unloading conveyor line; (4)Control the unloading and alignment platform to descend to the unloading conveyor line to complete the transportation of the battery cell and subsequent processes of end-face flattening and patting; (5)During the process of the unloading and alignment platform returning to the material receiving position, self-align the position of its card slot support to maintain symmetry with the unloading conveyor line.

[0029] Specifically, in the embodiment of the present invention, the "battery cell" refers to a wound cylindrical battery unit, including positive and negative electrode plates and a separator. The winding process of the battery cell involves winding the positive and negative electrode plates and the separator together into a cylindrical battery cell, and a series of processing operations need to be carried out after winding.

[0030] The wound battery cell is transported by a dedicated transfer device. The transfer device includes a double-jaw cylinder, which can move smoothly by clamping both ends of the battery cell. This device accurately delivers the battery cell to the hole-punching station, and the main function of the hole-punching station is to punch holes in the pole column diaphragm of the battery cell. The hole-punching process is used to ensure the effective connection between the pole column and the diaphragm of the battery cell, thereby ensuring the performance of the battery. After this process is completed, the end face and the diaphragm connection part of the battery cell have been processed, facilitating subsequent unloading and positioning.

[0031] The battery cell after hole-punching is sent to the unloading and alignment platform by a three-jaw transfer module. The unloading and alignment platform is provided with a vision detection device, which consists of a CCD camera and an infrared light source. The CCD camera is used to photograph the distances from the edges of the diaphragms on both sides of the battery cell to the center of the card slot type unloading conveyor line, and then calculate the position offset of both sides of the battery cell. This vision system analyzes the offset parameters between the battery cell and the unloading conveyor line through image processing algorithms, determines whether the battery cell is accurately aligned, and if not, calculates the offset amount for subsequent deviation correction processing.

[0032] Based on the offset feedback from the visual detection device, the system calculates the required rectification compensation value according to the magnitude and direction of the offset. The specific compensation value is calculated by two groups of CCD visions on the inner and outer sides, that is, by calculating the distances from the edges of the diaphragm on both sides of the battery core to the card slots. After being processed by the PLC control system, the rectification compensation value generates a digital signal and is transmitted to the servo drive system through the EtherCAT communication protocol. The servo driver controls the servo motor of the unloading and setting platform according to the compensation value, drives the platform to move, and adjusts the position of the battery core to make the battery core symmetric with respect to the center of the unloading conveyor line. This step ensures that the forces on both end faces of the battery core are consistent, avoiding secondary bending and misalignment of the tabs due to position offset.

[0033] After completing the rectification operation, the unloading and setting platform starts to descend. The descending process is controlled by a lifting slide table driven by a servo motor. During the descending process, the position of the battery core inside the setting platform is stably maintained. The battery core is sent to the unloading conveyor line during the descending process. The unloading conveyor line supports the battery core to ensure that the battery core can smoothly pass through the subsequent flattening and patting processes. The flattening and patting processes are carried out by dedicated flattening and patting mechanisms to ensure that both end faces of the battery core are flat, avoiding uneven flattening caused by offset during the winding process.

[0034] When the unloading and setting platform completes the conveying of the battery core, the platform starts to return to the material receiving position. During the return process, the platform is adjusted through a self-tuning mechanism. The tuning process is achieved through a feedback control system to ensure that the card slots on both sides of the platform are always in a position symmetric with the unloading conveyor line. The self-tuning mechanism is controlled by a Y-direction rectification servo module driven by a servo, which can perform fine-tuning according to the actual position to ensure that the card slot position of the setting platform is maintained at the required symmetric position. This step ensures that the unloading and setting platform can return to the initial symmetric state during the material receiving process, preparing for the next operation.

[0035] Adopting the above technical solution, through precise visual detection, compensation control, and servo drive adjustment, it is possible to effectively correct the position offset of the battery core during the winding and punching processes. This method can ensure the accurate alignment of the battery core during unloading, thereby ensuring the uniformity of the subsequent end face flattening and patting processes. By improving the force consistency on both sides of the battery core, the situation of inconsistent tab bending is reduced, significantly improving the qualified rate of the battery.

[0036] In an embodiment of the present application, the visual detection device includes CCD area array cameras arranged on both sides of the battery core for capturing the distances between the edges of the battery core diaphragm and the edges of the card slots on the unloading and setting platform.

[0037] Specifically, the battery cell after punching is transported to the unloading and rectifying platform, which is equipped with a vision detection device for detecting the position offset of the battery cell relative to the unloading conveyor line. The vision detection device includes two groups of CCD area cameras arranged on both sides of the battery cell. Each group of cameras is located on both sides of the battery cell, and the camera lenses are aligned with the diaphragm edges of the battery cell. The images captured by the cameras are analyzed by an image processing system to measure the distance between the diaphragm edge of the battery cell and the edge of the card slot on the unloading and rectifying platform. Specifically, the CCD area camera irradiates the battery cell through an infrared dot matrix bar light source to generate images of the two sides of the battery cell, and calculates the specific offset between the two sides of the battery cell and the card slot according to the image processing algorithm.

[0038] According to the offset feedback by the vision detection device, the system analyzes the images captured by the CCD cameras, calculates the distance difference between the diaphragm edges on both sides of the battery cell and the edge of the card slot on the unloading and rectifying platform. The system calculates the distance difference between the two sides to obtain a compensation value and generates a control signal. Through the EtherCAT communication protocol, the control signal is transmitted to the PLC control system. After further processing by the PLC, the motion instruction is sent through the servo drive system to adjust the position of the unloading and rectifying platform. This control signal can drive the servo motor to accurately adjust the offset of the unloading and rectifying platform, ensuring that the battery cell is centrosymmetric relative to the center of the unloading conveyor line, thereby ensuring the accurate positioning of the battery cell in subsequent processes.

[0039] By adopting the above technical solution, by arranging CCD area cameras on both sides of the battery cell, the distance between the diaphragm edge of the battery cell and the edge of the card slot on the unloading and rectifying platform can be measured with high precision, thereby effectively judging the offset of the battery cell. The accurate measurement of this vision detection device and the subsequent compensation control can ensure the accurate position of the battery cell during the entire unloading process.

[0040] In an embodiment of the present application, the calculation logic of the deviation correction compensation value is as follows: Obtain the inner distance M and the outer distance N of the battery cell through vision detection; Calculate the deviation correction median value T = (M + N) / 2; Determine the deviation correction direction and compensation amount according to the inner offset i = M - T.

[0041] Specifically, the vision detection device measures the inner and outer distances of the battery cell through two groups of CCD area cameras, denoted as the inner distance M and the outer distance N respectively. Then, the system calculates the deviation correction median value T, and the formula is: 𝑇=(𝑀+𝑁) / 2; the calculated deviation correction median value T represents the ideal centering position on both sides of the battery cell. Next, by calculating the inner offset i, the formula is: i = M - T. This calculation result determines the offset i of the inner side of the battery cell relative to the ideal position. According to the positive and negative values of the offset i, the system can judge the deviation correction direction and the compensation amount required: When i ≥ 0, it indicates that the position of the inner battery cell is offset inward relative to the reference T. The system will adjust the deviation correction platform to compensate outward according to the offset amount i, so that both sides of the battery cell are symmetric with respect to the center of the unloading conveyor line.

[0042] When i < 0, it indicates that the position of the inner battery cell is offset outward relative to the reference T. The system will adjust the deviation correction platform to compensate inward according to the offset amount i, so as to achieve the centering of the battery cell.

[0043] According to this deviation correction compensation value, the system generates corresponding control signals, and the instructions are transmitted to the PLC control system through the EtherCAT communication protocol. The PLC drives the unloading setting platform to adjust the position through the servo motor, ensuring the central symmetry of the battery cell in the unloading conveyor line and optimizing the subsequent processing procedures.

[0044] Adopting the above technical solution, the distance data of the inner and outer sides are obtained through the vision detection device, the deviation correction median value T is calculated, and the deviation correction direction and compensation amount are accurately judged according to the inner offset amount i, so that the position adjustment of the battery cell can be precisely controlled.

[0045] In an embodiment of the present application, the control signal is transmitted through the communication link between the PLC and the servo driver, and the communication link includes at least one of Ethernet and EtherCAT protocol.

[0046] Specifically, through Ethernet, the control signal can be transmitted through the TCP / IP protocol to ensure high-speed data transmission in a large production area. EtherCAT is a real-time industrial Ethernet protocol with the characteristics of high speed and low latency, and can achieve precise control signal transmission. The PLC establishes a communication link with the servo driver through the EtherCAT protocol to adjust the servo motor in real time and drive the unloading setting platform to adjust the position.

[0047] Adopting the above technical solution, through the communication link (including Ethernet and EtherCAT protocol) between the PLC and the servo driver, precise control signal transmission can be achieved, ensuring the real-time performance of the battery cell deviation correction process.

[0048] In an embodiment of the present application, the deviation correction actuator includes a Y-direction servo module for driving the slot bracket of the unloading setting platform to move perpendicular to the conveying direction.

[0049] Specifically, the Y-direction servo module controls the movement of the slot bracket to adjust it to an ideal symmetric position, thereby ensuring the central symmetry of the battery cell relative to the unloading conveyor line.

[0050] After the correction and compensation operations are complete, the unloading and leveling platform's slot brackets are precisely adjusted using a Y-axis servo module to ensure the battery cells are symmetrical relative to the center of the unloading conveyor line. Next, the unloading and leveling platform descends, and the battery cells on the platform are smoothly transported to the unloading conveyor line. This process is controlled by a servo-driven lift slide, ensuring the smooth movement of the battery cells to the next station for the subsequent flattening and leveling processes.

[0051] This technical solution uses a Y-direction servo module to precisely control the movement of the unloading and setting platform's slot brackets, effectively adjusting the battery cell's position and ensuring symmetry with the unloading conveyor line, thereby ensuring accuracy in subsequent processing steps. The precise adjustment of the Y-direction servo module enhances the flexibility and accuracy of the correction process.

[0052] In one embodiment of the present application, the lifting and lowering of the unloading and setting platform is achieved by a Z-direction servo motor driving a screw module.

[0053] Specifically, the Z-direction servo motor drives the lead screw module for precise vertical control. The lead screw module rotates the lead screw to move the leveling platform up and down, ensuring a smooth descent to the unloading conveyor line. This process precisely controls the position of the battery cells during descent, ensuring they enter the conveyor line accurately and pass smoothly through the subsequent flattening and leveling processes.

[0054] This technical solution, using a Z-direction servo motor to drive the lead screw module for precise lifting control, ensures the vertical movement accuracy and stability of the unloading and setting platform. This technical solution ensures smooth and accurate vertical movement of the battery cells, avoiding cell position deviations caused by unbalanced or inaccurate lifting.

[0055] In one embodiment of the present application, the spacing between the slot brackets of the unloading and leveling platform is larger than the spacing between the unloading conveying lines by A, A≥20mm, and the spacing retained on both sides is A / 2.

[0056] Specifically, when A is 20mm, the spacing between the slot brackets on the unloading and setting platform is 20mm larger than that of the unloading conveyor line. To ensure stable and accurate conveying and positioning of the battery cells during unloading, the slot brackets retain an adjustment distance of 10mm on each side. This design allows for fine-tuning of the slot brackets during unloading, allowing for appropriate corrections and adjustments based on real-time changes in cell position.

[0057] This technical solution, combined with the adjustable spacing of the unloading platform's slot brackets, effectively addresses even minor cell misalignment during transport. The 10mm adjustment distance on either side of the slot brackets ensures stability and accuracy during unloading.

[0058] In an embodiment of the present application, the vision detection device further includes an infrared dot matrix bar light source for enhancing the imaging contrast of the diaphragm edge.

[0059] Specifically, in order to improve the imaging contrast of the image and the detection accuracy, the vision detection device further includes an infrared dot matrix bar light source. This light source generates uniform infrared light irradiation on both sides of the battery cell, enhancing the imaging contrast of the diaphragm edge of the battery cell. The dot matrix bar structure of the infrared light source makes the diaphragm edge of the battery cell clearer when photographed by the CCD camera, thus ensuring that the vision system can accurately capture the precise positions of the diaphragm edges on both sides of the battery cell and the edge of the card slot, avoiding the influence of insufficient light or background interference on the detection accuracy.

[0060] By adopting the above technical solution, by adding an infrared dot matrix bar light source to the vision detection device, the imaging contrast of the diaphragm edge can be effectively improved. By enhancing the contrast, the system can more clearly identify the distance between the diaphragm edge of the battery cell and the edge of the card slot, significantly improving the accuracy and reliability of vision detection. It ensures that the measurement of the offset of the battery cell is more accurate, thereby improving the accuracy of the rectification process and avoiding problems such as uneven stress caused by offset and inconsistent bending of the tab.

[0061] As Figure 2 shown, the present application also discloses a battery cell winding and unloading deviation compensation device, including: A transfer module 10 configured to transfer the wound battery cell to the hole punching station and the unloading setting platform; A vision detection module 20 provided on both sides of the unloading setting platform for obtaining the position offset of both sides of the battery cell relative to the unloading conveyor line; A rectification control module 30 communicatively connected to the vision detection module 20, generating a rectification control signal based on the position offset; The unloading setting platform is equipped with a Y-direction servo rectification module, receiving the rectification control signal and adjusting the position of the battery cell to central symmetry; A lifting drive module 40 driving the unloading setting platform to lift along the Z direction and transferring the rectified battery cell to the unloading conveyor line; A conveyor line module 50, including a card slot type unloading conveyor line for receiving the battery cell and conveying it to the flattening and patting stations; and A self-tuning mechanism configured to reset the card slot support position when the unloading setting platform returns to the material receiving position, maintaining symmetry with the conveyor line.

[0062] Specifically, the structural design of the transfer module 10 is used to move the wound battery cell from the winding station to the hole punching station and the unloading setting platform. The transfer module 10 includes a plurality of cylinders and a gripper device. The cylinders cooperate with the grippers to precisely control the clamping and transfer of the battery cell, ensuring that the battery cell is not damaged or offset during the movement.

[0063] The visual inspection module 20 is arranged on both sides of the unloading and setting platform and is used to obtain the position offset of both sides of the battery cell relative to the unloading conveyor line in real time. The visual inspection module 20 includes two groups of CCD area array cameras, and each group of cameras corresponds to the inner and outer sides of the battery cell respectively. The CCD area array camera adopts a high-resolution imaging system and is equipped with an infrared dot matrix bar light source to enhance the imaging contrast of the edge of the battery cell diaphragm, enabling the camera to more clearly identify the position offset of the battery cell. The infrared dot matrix bar light source uniformly irradiates the battery cell to improve the imaging effect in low-light or complex environments. The visual inspection module 20 calculates the offset of both sides of the battery cell through an accurate image processing algorithm and transmits the detection result to the deviation correction control module 30.

[0064] The deviation correction control module 30 is communicatively connected to the visual inspection module 20, receives and analyzes the data from the visual inspection module 20. Based on the offset of the battery cell, the deviation correction control module 30 calculates the required deviation correction compensation value and generates a deviation correction control signal. This control signal is transmitted to the Y-direction servo deviation correction module through a PLC (programmable logic controller).

[0065] The unloading and setting platform adjusts the position of the battery cell through the Y-direction servo deviation correction module to ensure that the battery cell is in a centrally symmetric position during the unloading process. The unloading and setting platform includes a plurality of support slots, and the spacing and position of the slots are accurately calculated to ensure that the battery cell can be stably placed on the platform. The Y-direction servo deviation correction module is driven by a servo motor to control the horizontal movement of the unloading and setting platform, finely adjust the position of the battery cell, so that both sides of the battery cell are subjected to the same force, and ensure the smooth progress of the subsequent flattening and patting processes.

[0066] The lifting drive module 40 is used to drive the unloading and setting platform to lift along the Z direction and accurately transfer the corrected battery cell to the unloading conveyor line. The lifting drive module 40 includes a servo motor and a lead screw module. The servo motor controls the rotation of the lead screw module, and then drives the unloading and setting platform to move up and down, ensuring that the battery cell maintains a stable position during the movement and is smoothly sent to the unloading conveyor line. By accurately controlling the lifting process, the battery cell is prevented from shifting or being damaged during the transition process.

[0067] The conveyor line module 50 includes a slot-type unloading conveyor line, which is used to receive and convey the battery cell to the flattening and patting stations. The slot-type unloading conveyor line is provided with a plurality of slots to ensure that the battery cell can maintain the correct position during the conveying process and avoid changes in the position of the battery cell caused by vibration or movement.

[0068] The self-tuning mechanism is used to automatically reset the slot support position of the unloading and setting platform when it returns to the material receiving position. The self-tuning mechanism includes a servo motor and a sensor. The sensor monitors the platform position in real time, and the servo motor adjusts the slot support position according to the feedback signal to ensure its symmetry with the unloading conveyor line.

[0069] With the above technical solution, through precise visual detection, deviation correction control, and servo drive system, the deviation problem of the battery cell during the unloading process is effectively compensated. The visual detection module 20, through the cooperation of two groups of CCD area array cameras and an infrared dot matrix bar light source, can provide clear and accurate image data, enabling the deviation correction control module 30 to precisely adjust the position of the battery cell to ensure that the battery cell is always at the central symmetry position of the unloading conveyor line. The precise adjustment of the Y-direction servo deviation correction module and the stable control of the lifting drive module 40 enable the battery cell to smoothly enter the subsequent process, ensuring that the two sides of the battery cell are evenly stressed during the processes of rolling and flattening.

[0070] In an embodiment of the present application, the visual detection module 20 includes: Two groups of CCD area array cameras, corresponding to the inner and outer sides of the battery cell respectively; An infrared dot matrix bar light source, arranged within the camera's field of view to enhance the imaging of the diaphragm edge.

[0071] Specifically, the visual detection module 20 includes two groups of CCD area array cameras and an infrared dot matrix bar light source. Each group of CCD area array cameras is respectively arranged on the inner and outer sides of the battery cell to capture images of both sides of the battery cell. The CCD camera on the inner side of the battery cell is used to detect the position of the inner diaphragm edge of the battery cell, and the CCD camera on the outer side is used to detect the position of the outer diaphragm edge of the battery cell. Through these two groups of CCD area array cameras, the visual detection module 20 can comprehensively detect the deviation amount of the battery cell relative to the unloading conveyor line.

[0072] Each group of cameras uses a high-resolution area array sensor, which can capture the fine structure of the diaphragm edges on both sides of the battery cell. The cameras precisely control the focal length and imaging angle to ensure clear images of the battery cell are captured for accurate calculation of the position information of the battery cell.

[0073] To improve the imaging contrast of the image, the infrared dot matrix bar light source is arranged within the field of view of the two groups of CCD cameras. The light source emits uniform infrared light to irradiate the edge area of the battery cell diaphragm, enhancing the contrast of the battery cell diaphragm edge in the CCD camera image. The light source configuration of the infrared dot matrix bar light source matches the field of view of the camera, enabling the light to evenly irradiate the battery cell diaphragm edge, avoiding uneven illumination or shadow generation, and ensuring that the camera can capture stable and high-contrast image data.

[0074] With the above technical solution, by setting two sets of CCD area array cameras and an infrared dot matrix bar light source, the vision detection module 20 can provide a high-contrast and clear image of the battery cell, ensuring high precision and high reliability during the detection process. The above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for compensating for the deviation of the core winding and unloading, characterized in that, It includes the following steps: (1) Transfer the wound battery cell to the hole punching station through a transfer device to complete the pole column diaphragm hole punching; (2) Transfer the battery cell after hole punching to the unloading and rectifying platform, and obtain the position offset of both sides of the battery cell relative to the unloading conveyor line through a vision detection device; (3) Calculate the deviation correction compensation value based on the position offset, generate a control signal and drive the deviation correction actuator to adjust the position of the unloading and rectifying platform to make the battery cell symmetric about the center of the unloading conveyor line; (4) Control the unloading and rectifying platform to descend to the unloading conveyor line to complete the conveying of the battery cell and subsequent end face flattening and patting processes; (5) During the process of the unloading and rectifying platform returning to the material receiving position, self-align the slot support position thereof to maintain symmetry with the unloading conveyor line.

2. The method for compensating for the deviation of the core winding and unloading according to claim 1, wherein, The vision detection device includes CCD area array cameras arranged on both sides of the battery cell, which are used to capture the distance between the edge of the battery cell diaphragm and the edge of the slot of the unloading and rectifying platform.

3. The method for compensating for the deviation of the core winding and unloading according to claim 2, characterized in that, The calculation logic of the deviation correction compensation value is as follows: Obtain the inner distance M and outer distance N of the battery cell through vision detection; Calculate the deviation correction median value T = (M + N) / 2; Determine the deviation correction direction and compensation amount according to the inner offset amount i = M - T.

4. The method for compensating for the deviation of the cell winding and unloading as described in claim 1, wherein, The control signal is transmitted through the communication link between the PLC and the servo driver, and the communication link includes at least one of Ethernet and EtherCAT protocol.

5. The method for compensating for the deviation of the core winding unloading as described in claim 1, wherein The deviation correction actuator includes a Y-direction servo module, which is used to drive the slot bracket of the unloading and rectifying platform to move perpendicular to the conveying direction.

6. The method for compensating the deviation of the core winding and discharging as described in claim 1, wherein, The lifting of the unloading and rectifying platform is realized by a Z-direction servo motor driving a lead screw module.

7. The method for compensating for the deviation of the cell winding and unloading as described in claim 1, wherein The distance between the slot brackets of the unloading and rectifying platform is larger than the distance between the unloading conveyor lines by A, A ≥ 20 mm, and the distance reserved on both sides is A / 2.

8. The method for compensating for the deviation of the core winding and discharging as described in claim 2, wherein The vision detection device further includes an infrared dot matrix bar light source, which is used to enhance the imaging contrast of the diaphragm edge.

9. A core winding unloading deviation compensation device, characterized in that, It includes: A transfer module configured to transfer the wound battery cell to the hole punching station and the unloading and rectifying platform; A vision detection module arranged on both sides of the unloading and rectifying platform, which is used to obtain the position offset of both sides of the battery cell relative to the unloading conveyor line; A deviation correction control module, communicatively connected to the vision detection module, and generating a deviation correction control signal based on the position offset; An unloading and rectifying platform, installed with a Y-direction servo deviation correction module, receiving the deviation correction control signal and adjusting the position of the battery cell to be symmetric about the center; A lifting drive module, driving the unloading and rectifying platform to lift in the Z direction, and transferring the deviation-corrected battery cell to the unloading conveyor line; A conveyor line module, including a slot-type unloading conveyor line, which is used to receive the battery cell and convey it to the flattening and patting station; and A self-aligning mechanism configured to reset the slot support position of the unloading and rectifying platform when it returns to the material receiving position to maintain symmetry with the conveyor line.

10. The core winding and unloading deviation compensation device according to claim 9, characterized in that, The vision detection module includes: Two groups of CCD area array cameras, corresponding to the inner and outer sides of the battery cell respectively; An infrared dot matrix bar light source, arranged within the camera's field of view to enhance the imaging of the diaphragm edge.

Images