Coating head structure of battery pole piece coating machine

Abstract

The invention relates to the technical field of coating machines, and discloses a coating head structure of a battery pole piece coating machine, which comprises two groups of vertical plates arranged oppositely, and a coating roller is arranged between the two groups of vertical plates; the bearing bottom plate is arranged at the tops of the two sets of vertical plates, each set of vertical plates is provided with a longitudinal driving mechanism, and the longitudinal driving mechanisms are matched with the bearing bottom plate, so that the bearing bottom plate is in longitudinal sliding fit with the vertical plates; the die head bottom plate is arranged on the bearing bottom plate and is in transverse sliding fit with the bearing bottom plate, a coating die head is arranged on the die head bottom plate, the coating die head is correspondingly arranged on the rear side of the coating roller, and a gap is formed between the coating die head and the coating roller; the distance measuring unit is arranged on the die head bottom plate and used for measuring the distance between the distance measuring unit and the coating roller. The linear distance of the coating roller is detected through the distance measuring sensor, so that the control system can judge according to the measured linear distance, the front-back stroke of the bearing bottom plate is controlled, the motor drives the bearing bottom plate to be longitudinally adjusted, and then real-time adjustment of the longitudinal positions of the die head bottom plate and the coating die head is achieved.

Description

Technical Field

[0001] This invention relates to the field of coating machine technology, and in particular to a coating head structure for a battery electrode coating machine. Background Technology

[0002] Lithium-ion batteries are mainly composed of positive electrode plates, negative electrode plates, separator paper, electrolyte, and casing. Both the positive and negative electrode plates are coated with positive and negative slurries onto metal foil. The metal foil is then folded into multiple layers and installed into the casing. The process of coating the slurry onto the metal foil requires a coating machine.

[0003] During the coating machine production process, the coating die head needs to be adjusted laterally. However, the lateral adjustment of the die head during the coating machine production process can easily cause changes in the blade distance, resulting in poor longitudinal consistency of the coating surface density. After the blade distance changes, manual adjustment is required, which can easily cause large longitudinal fluctuations in the coating surface density and large loss of film yield. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a coating head structure for a battery electrode coating machine. By detecting the straight-line distance of the coating roller through a distance sensor, the control system can make judgments based on the measured straight-line distance, thereby controlling the forward and backward stroke motors of the load-bearing base plate to drive the longitudinal adjustment of the load-bearing base plate, thus realizing real-time adjustment of the longitudinal position of the die base plate and the coating die head.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: A coating head structure for a battery electrode coating machine includes: Two sets of vertical plates are arranged opposite each other, with a coating roller between the two sets of vertical plates; A load-bearing base plate is located on top of two sets of upright plates. Each set of upright plates is equipped with a longitudinal drive mechanism. The longitudinal drive mechanism cooperates with the load-bearing base plate to enable longitudinal sliding cooperation between the load-bearing base plate and the upright plates. The die head base plate is set on the load-bearing base plate and slides laterally with the load-bearing base plate. The die head base plate is provided with a coating die head, which is correspondingly set on the rear side of the coating roller and has a gap between it and the coating roller. The distance measuring unit, located on the die head base plate, is used to measure the distance to the coating roller. The load-bearing base plate adjusts its longitudinal position according to the detection of the distance measuring sensor.

[0006] As a further implementation, two sets of vertical plates are arranged in parallel, with the top of the vertical plates rotating in conjunction with the end of the coating roller via a support frame, and a coating roller drive motor is provided on the outer side of one set of vertical plates.

[0007] As a further implementation, longitudinal slide rails are provided at the top rear end of the two sets of upright plates, and the load-bearing base plate slides in conjunction with the longitudinal slide rails.

[0008] As a further implementation, the output end of the longitudinal drive mechanism is threadedly engaged with the load-bearing base plate via a threaded rod, and the longitudinal drive mechanism drives the load-bearing base plate to slide back and forth along the longitudinal slide rail to achieve position adjustment.

[0009] As a further implementation, a transverse drive mechanism is provided at one end of the top of the load-bearing base plate. The output end of the transverse drive mechanism is engaged with the mold head base plate through a threaded rod, and the mold head base plate and the transverse slide rail at the top of the load-bearing base plate achieve sliding engagement.

[0010] As a further implementation, the distance measuring unit is a distance sensor used to measure the straight-line distance between itself and the coating roller. The distance sensor monitors the distance value in real time and transmits it to the PLC control system. The measured value serves as the basis for real-time adjustment of the blade distance.

[0011] As a further implementation, the die base plate is provided with mounting holes for mounting the coating die.

[0012] As a further implementation, the top surface of the die head base plate is a planar structure, so that the front lip of the coating die head is parallel to the coating roller.

[0013] As a further implementation, the length of the load-bearing base plate is greater than the spacing between the uprights.

[0014] As a further implementation, the length of the load-bearing base plate is greater than the length of the mold head base plate.

[0015] The beneficial effects of the present invention are as follows: This invention uses a distance sensor to detect the straight-line distance of the coating roller, enabling the control system to make judgments based on the measured straight-line distance. This allows the control system to control the forward and backward stroke motors of the load-bearing base plate to drive the longitudinal adjustment of the load-bearing base plate, thereby achieving real-time adjustment of the longitudinal position of the die base plate and the coating die. The lateral movement motor enables the lateral adjustment of the coating die.

[0016] This invention achieves stable and repeatable blade spacing during the lateral movement of the coating machine, completely eliminating the problems of long manual adjustment cycles, slow response, and large longitudinal fluctuations in surface density caused by blade spacing changes during lateral movement. It can improve the consistency of film surface density and the yield of coated electrodes.

[0017] The invention features a double-base plate support system consisting of a die head base plate and a load-bearing base plate, which provides high mechanical strength. This system can prevent mechanical deformation caused by interruption of the coating die head, ensure the horizontal parallelism between the die head and the coating roller during the coating process, and improve the lateral consistency of the coating surface density. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 This is a schematic diagram of the coating head structure of the battery electrode coating machine in an embodiment of the present invention.

[0020] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0021] The components include: 1. Coating roller, 2. Coating die head, 3. Die head base plate, 4. Distance sensor, 5. Load-bearing base plate, 6. Horizontal movement motor, 7. Load-bearing base plate forward and backward travel motor, and 11. Vertical plate. Detailed Implementation

[0022] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] Example 1 In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a coating head structure for a battery electrode coating machine includes two sets of upright plates 11, a load-bearing base plate 5, a die head base plate 3, and a ranging unit.

[0024] Two sets of upright plates 11 are arranged opposite each other, with a coating roller 1 between the two sets of upright plates; a load-bearing base plate 5 is set on the top of the two sets of upright plates, and each set of upright plates is provided with a longitudinal drive mechanism, which cooperates with the load-bearing base plate 5 to make the load-bearing base plate and the upright plate slide longitudinally; a die head base plate is set on the load-bearing base plate and slides laterally with the load-bearing base plate 5, and a coating die head 2 is provided on the die head base plate 3, which is correspondingly set on the rear side of the coating roller 1 and has a gap between it and the coating roller 1; a distance measuring unit is set on the die head base plate 3 to measure the distance to the coating roller 1, and the load-bearing base plate 5 adjusts its longitudinal position according to the detection of the distance measuring sensor.

[0025] like Figure 1 As shown, two sets of upright plates 11 are arranged in parallel. The top of the upright plates 11 is rotatably engaged with the end of the coating roller 1 through a support frame. One set of upright plates is equipped with a coating roller drive motor on its outer side. The coating roller 1 drive motor can drive the coating roller 1 to rotate.

[0026] Two sets of upright plates 11 are arranged along the longitudinal direction. The top and rear ends of the two sets of upright plates 11 are provided with longitudinal slide rails. The load-bearing base plate is slidably engaged with the longitudinal slide rails. The load-bearing base plate 5 is arranged laterally. At both ends of the bottom of the load-bearing base plate 5, sliders are arranged longitudinally. The sliders are engaged with the longitudinal slide rails.

[0027] The output end of the longitudinal drive mechanism is threadedly engaged with the load-bearing base plate via a threaded rod. Specifically, the load-bearing base plate 5 is provided with a threaded hole, through which the threaded rod passes longitudinally. The longitudinal drive mechanism is a forward and backward stroke motor 7 for the load-bearing base plate, which drives the threaded rod to work, thereby enabling the load-bearing base plate 5 to slide longitudinally (back and forth) along the longitudinal slide rail, thus achieving position adjustment of the load-bearing base plate relative to the longitudinal slide rail.

[0028] A transverse drive mechanism, which is a transverse motor 6, is provided at one end of the top of the load-bearing base plate 5. The mold head base plate 3 is located on the load-bearing base plate 5. The mold head base plate 3 has a threaded hole in the transverse direction. The output end of the transverse motor 6 is engaged with the mold head base plate 3 through a threaded rod. A transverse slide rail is provided at the top of the load-bearing base plate 5. A slider structure is provided in the transverse direction at the bottom of the mold head base plate 3. The slider structure achieves sliding engagement with the load-bearing base plate 5. The transverse motor 6 enables the mold head base plate 3 to slide laterally along the transverse slide rail on the load-bearing base plate 5, thereby adjusting the transverse position of the mold head base plate 3.

[0029] In this embodiment, the length of the load-bearing base plate 5 is greater than the spacing between the vertical plates 11, so that the load-bearing base plate can be arranged to slide longitudinally between the tops of the vertical plates.

[0030] The length of the load-bearing base plate 5 is greater than the length of the mold head base plate 3, so that the mold head base plate 3 can slide laterally on the load-bearing base plate 5.

[0031] The die base plate 3 is provided with mounting holes for mounting the coating die 2. The coating die 2 is fixed to the die base plate 3 by bolts. The top surface of the die base plate 3 is a flat structure, parallel to the horizontal plane, so that the front lip of the coating die 2 is parallel to the coating roller 1.

[0032] The distance measuring unit is a distance measuring sensor 4, which is used to measure the straight distance between the coating roller and the distance measuring sensor. The distance measuring sensor monitors the distance value in real time and transmits it to the PLC control system. The measured value serves as the basis for real-time adjustment of the blade distance, thereby enabling the load-bearing base plate 5 to drive the coating die head 2 to adjust its longitudinal position in real time.

[0033] like Figure 1 As shown, the above structure is arranged on the coating machine. The coating roller 1 and the coating die 2 are the lead-out positions for the coating current collector (substrate). The substrate is attached to the surface of the coating roller. Under the rotation of the coating roller 1, the slurry can be sprayed out of the coating die 2 at high speed under shear force and then uniformly coated on the current collector to form a wet coating film. The wet film moves through the upper surface of the coating roller 1 and the driven roller of the coating head, and moves into the coating oven under the friction force of the coating roller 1 to be uniformly baked into a coated electrode sheet.

[0034] During the entire coating slurry extrusion process at the coating die 2, the distance between the coating roller 1 and the coating die 2 is a crucial factor affecting the consistency of coating weight and surface density. The coating roller 1 and coating die 2 constitute the coating process structure. The coating roller 1 provides the power source for the rotation of the current collector (substrate) and ensures that the current collector (substrate) receives the coating slurry without wrinkles. Figure 1 The coating die 2 shown in the figure provides a uniform slurry spraying process for the coating process.

[0035] The load-bearing base plate 5 provides mechanical strength as a mechanical reinforcing rib, ensuring that the die head and other structures do not deform under load, and that the horizontality of the coating die head lip is maintained at ±5μm, meeting the requirement of horizontal consistency during the coating process. When the die head base plate 3 does not move, the coating die head 2 is absolutely stationary relative to the load-bearing base plate 5.

[0036] The die head base plate 3 and the load-bearing base plate 5 are longitudinally positioned by the transverse slide rail and the slider. After multiple disassemblies and reassemblies, the die head base plate 3 and the load-bearing base plate are kept in the same longitudinal relative position, which reduces the amount and number of adjustments during the coating process.

[0037] The die head base plate 3 and the load-bearing base plate 5 are mechanical carriers for fixing the coating die head 2 and adjusting the blade distance, providing mechanical strength support for the coating head production process, ensuring the horizontal parallelism between the coating die head 2 and the coating roller 1 during the coating process, and improving the lateral consistency of the coating surface density.

[0038] Distance sensor 4 measures the distance between itself and coating roller 1. The displacement sensor uses a laser measurement signal to measure the straight-line distance between the die head base plate and the coating roller. The coating roller's circular runout is designed to be less than or equal to 1.5μm to ensure accurate and distortion-free measurements from distance sensor 4. Distance sensor 4 monitors the distance value in real time and transmits it to the PLC control system. The measured value serves as the basis for real-time adjustment of the blade distance, providing a reference for blade distance adjustment during the coating head production process.

[0039] The forward and backward stroke motor 7 of the load-bearing base plate 5 provides the power for adjusting the blade distance. The force of the forward and backward stroke motor 7 of the load-bearing base plate 5 acts on the load-bearing base plate, pushing the load-bearing base plate 5 to move back and forth, thereby adjusting the gap between the coating roller 1 and the coating die head 2, and realizing the blade distance adjustment. During the normal production process of the coating equipment, the forward and backward stroke motor 7 of the load-bearing base plate 5 provides a constant force to the load-bearing base plate, pushing the coating die head 2 to the set position, that is, after the blade distance value reaches the set value, the blade distance remains stable during the process.

[0040] When the coating die head 2 needs to move forward, the forward and backward stroke motor 7 of the load-bearing base plate 5 pushes the load-bearing base plate forward along the longitudinal direction; when the die head needs to move backward, it pushes the load-bearing base plate 5 backward along the longitudinal direction; under the indication of the distance sensor 4, the control system gives a forward or backward adjustment signal to realize the real-time adjustment of increasing or decreasing the blade distance.

[0041] It is understood that the slide rail in this embodiment is a precision slide rail, which provides a frictionless movement track for the coating die head 2 during adjustment, and the adjustment process is electric and noiseless.

[0042] During the coating process, the distance sensor monitors the distance between the die head base plate 3 and the coating roller in real time and feeds it back to the control system to ensure the accuracy of the measurement reference. The control system adjusts the position of the load-bearing base plate driven by the forward and backward stroke motors, which can quickly respond to adjustment needs and reduce the occurrence of defects during the adjustment process. The control system adjusts the blade distance in real time and accurately through PID calculation, reducing the response time of manual judgment. The forward and backward stroke motors of the load-bearing base plate of the coating machine adopt high-precision servo motors to ensure stable and ±0.5μm repeatability of the blade distance, thereby improving the uniformity of film surface density and the quality of coated electrode sheets.

[0043] Compared with traditional design structures, this patented technical solution features a double-base plate support with a die head base plate and a load-bearing base plate, which provides high mechanical strength. This avoids mechanical deformation caused by interruption of the coating die head, ensures the horizontal parallelism between the coating die head and the coating roller during the coating process, and improves the lateral consistency of the coating surface density. The mechanical cooperation mechanism between the die head base plate and the load-bearing base plate can reduce positioning accuracy errors after die head maintenance / die head base plate disassembly and assembly, and reduce the amount of fixed adjustment required when restarting production after equipment maintenance.

[0044] Compared with traditional design structures, the real-time automatic adjustment of the coating head control system can reduce the operation time of manual adjustment after the operator visually inspects the changes in coating surface density. The scrap of electrode sheets caused by longitudinal defects in surface density during the adjustment process can be greatly reduced or basically avoided. It can reduce the workload of operators in the coating production process, reduce the amount of repeated adjustments by operators, and reduce the requirements for the operating experience and skills of operators in the coating production process.

[0045] Compared with traditional design structures, this patented technical solution has higher equipment compatibility. After maintenance or process change of coating equipment, it can reduce the first article debugging time and improve the equipment OEE. During the production process of the coating machine, it can reduce the workload of production staff and reduce production operating costs. It can also reduce the number of defective products during the production process, thereby improving the product qualification rate and product quality.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A coating head structure for a battery electrode coating machine, characterized in that, include: Two sets of vertical plates are arranged opposite each other, with a coating roller between the two sets of vertical plates; A load-bearing base plate is located on top of two sets of upright plates. Each set of upright plates is equipped with a longitudinal drive mechanism. The longitudinal drive mechanism cooperates with the load-bearing base plate to enable longitudinal sliding cooperation between the load-bearing base plate and the upright plates. The die head base plate is set on the load-bearing base plate and slides laterally with the load-bearing base plate. The die head base plate is provided with a coating die head, which is correspondingly set on the rear side of the coating roller and has a gap between it and the coating roller. The distance measuring unit, located on the die head base plate, is used to measure the distance to the coating roller. The load-bearing base plate adjusts its longitudinal position according to the detection of the distance measuring sensor.

2. The coating head structure of a battery electrode coating machine according to claim 1, characterized in that, Two sets of vertical plates are arranged in parallel. The top of the vertical plates is rotatably engaged with the end of the coating roller via a support frame. One set of vertical plates has a coating roller drive motor on its outer side.

3. The coating head structure of a battery electrode coating machine according to claim 1, characterized in that, The top and rear ends of the two sets of upright plates are provided with longitudinal slide rails, and the load-bearing base plate slides in conjunction with the longitudinal slide rails.

4. The coating head structure of a battery electrode coating machine according to claim 3, characterized in that, The output end of the longitudinal drive mechanism is threadedly engaged with the load-bearing base plate via a threaded rod. The longitudinal drive mechanism drives the load-bearing base plate to slide back and forth along the longitudinal slide rail to achieve position adjustment.

5. The coating head structure of a battery electrode coating machine according to claim 1, characterized in that, The top end of the load-bearing base plate is provided with a transverse drive mechanism. The output end of the transverse drive mechanism is engaged with the die head base plate through a threaded rod. The die head base plate and the transverse slide rail on the top of the load-bearing base plate achieve a sliding engagement.

6. The coating head structure of a battery electrode coating machine according to claim 1, characterized in that, The distance measuring unit is a distance sensor used to measure the straight-line distance between itself and the coating roller. The distance sensor monitors the distance value in real time and transmits it to the PLC control system. The measured value serves as the basis for real-time adjustment of the blade distance.

7. The coating head structure of a battery electrode coating machine according to claim 6, characterized in that, The die base plate is provided with mounting holes for mounting the coating die.

8. The coating head structure of a battery electrode coating machine according to claim 7, characterized in that, The top surface of the die head base plate is a planar structure, which ensures that the front lip of the coating die head is parallel to the coating roller.

9. The coating head structure of a battery electrode coating machine according to claim 1, characterized in that, The length of the load-bearing base plate is greater than the spacing between the vertical plates.

10. The coating head structure of a battery electrode coating machine according to claim 1, characterized in that, The length of the load-bearing base plate is greater than the length of the mold base plate.

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