Perimeter-adjustable roller pin device

Abstract

The utility model discloses a kind of outer perimeter adjustable roll needle devices, comprising: air cylinder;Pressure sensor connected on the telescopic rod of air cylinder;At least two roll needles, roll needle is arranged in parallel along circumferential direction, at least one roll needle is connected with connecting piece, the side of connecting piece deviating from roll needle is equipped with first inclined plane, the side of connecting piece deviating from roll needle is equipped with adjusting part, adjusting part is equipped with and the second inclined plane of first inclined plane is pasted;Driving rod, one end and adjusting part are connected, the other end is towards pressure sensor, under the drive of air cylinder, driving rod promotes adjusting part and moves along the axial direction of roll needle, to promote roll needle and move along radial direction with connecting piece. Through the above technical scheme, the force of air cylinder to adjusting part is detected by pressure sensor, so as to avoid the quality problem of battery cell caused by improper force, reduce the defective rate of battery cell, improve the performance consistency of lithium battery.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically a needle winding device with adjustable outer circumference. Background Technology

[0002] In the production process of lithium-ion battery cells, the winding machine plays a crucial role. The winding process involves sequentially winding the positive electrode sheet, negative electrode sheet, and separator into a battery cell. To accommodate the winding requirements of different battery cell specifications, the winding needles of the winding machine are designed with adjustable outer circumference. For example, CN206697568U, published on December 1, 2017, describes an adjustable winding needle mechanism for a multi-tab power winding machine, which utilizes a wedge-shaped structure to adjust the outer circumference of the winding needle.

[0003] However, most current needle winding adjustment mechanisms use traditional on / off valves to control cylinder movements. This method lacks precise cylinder force adjustment. When dealing with electrode sheets and separators of varying thicknesses and materials, it's difficult to provide a suitable and stable force. If the force is too small, material displacement can occur at the beginning of winding, leading to misalignment and affecting the internal structure of the cell, thus reducing lithium battery performance and safety. If the force is too large, it may damage the electrode sheets and separator, similarly reducing product quality. Furthermore, traditional control methods have slow response times, failing to meet the demands of high-speed winding machines for rapid and precise movements, thus limiting production efficiency. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this utility model provides a needle winding device with an adjustable outer circumference. The adjustable needle winding device sets a pressure sensor between the cylinder and the adjusting part of the needle winding to detect the force of the cylinder on the adjusting part of the needle winding in real time, so as to ensure the stability of the cylinder force, reduce the cell defect rate, and improve the performance consistency of lithium batteries.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a needle winding device with adjustable outer circumference, comprising: cylinder; The coiling needle has at least two coiling needles arranged side by side along the circumferential direction. At least one coiling needle is connected to a connector. The connector has a first inclined surface on the side away from the coiling needle. The connector has an adjusting component on the side away from the coiling needle. The adjusting component has a second inclined surface that fits against the first inclined surface. A drive rod, one end of which is connected to the adjusting member, and the other end of which faces the telescopic rod of the cylinder. Under the drive of the cylinder, the drive rod pushes the adjusting member to move axially along the needle coil, so as to push the needle coil to move radially along the connecting member. A pressure sensor is disposed between the extension rod of the cylinder and the drive rod.

[0006] Through the above technical solution, by detecting the force exerted by the cylinder on the adjusting component using a pressure sensor, it can be understood that maintaining the force exerted by the cylinder on the adjusting component maintains the outer circumference of the winding needle. This avoids cell quality problems caused by improper force, reduces the cell defect rate, and improves the consistency of lithium battery performance.

[0007] Furthermore, it also includes an electro-proportional valve connected to the cylinder. The electro-proportional valve employs closed-loop control combined with sensor feedback to dynamically compensate for load changes and maintain output stability, enabling precise control of the cylinder force. Moreover, the electro-proportional valve has a fast response speed, which helps improve winding efficiency.

[0008] Furthermore, it also includes a guide cylinder having a channel extending axially along the drive rod, the drive rod passing through the channel. Under the action of the guide cylinder, the drive rod can only move along its axial direction to ensure that the force of the cylinder is fully applied to the adjusting member.

[0009] Furthermore, a first elastic element is provided between the guide cylinder and the drive rod. Under the action of the first elastic element, the drive rod moves relative to the guide cylinder toward the cylinder. When the cylinder contracts, the first elastic element causes the drive rod to move toward the cylinder, ensuring that the needle coil is in the state of minimum outer circumference when there is no force.

[0010] Furthermore, the drive rod and the pressure sensor are connected to the side opposite to the cylinder. With this technical solution, the drive rod can both increase the outer circumference of the coiling needle as the cylinder telescopic rod extends and retract as the cylinder telescopic rod retracts.

[0011] Furthermore, it also includes a guide rail extending axially along the drive rod, the guide rail having a slider, the slider being fixedly connected to the drive rod. The guide rail ensures that the drive rod can only move along its axial direction, thereby ensuring that the force of the cylinder is fully applied to the adjusting component.

[0012] Furthermore, it also includes a controller, to which the pressure sensor and the electro-proportional valve are respectively connected. The operator only needs to input the required force into the controller, which then outputs a corresponding electrical signal based on the force and transmits it to the electro-proportional valve. The electro-proportional valve adjusts the output air pressure to actuate the cylinder.

[0013] Furthermore, the connector is attached to a guide mechanism extending radially along the needle coil. A second elastic element is provided between the guide mechanism and the connector. Under the action of the second elastic element, the connector moves toward the adjusting element. When the cylinder contracts, the second elastic element causes the connector to move toward the cylinder along with the needle coil, ensuring that the needle coil is in a state of minimum outer circumference when there is no force.

[0014] Based on the above technical solution, the beneficial effects of this utility model are as follows: The adjustable needle winding device disclosed in this application has a pressure sensor installed between the cylinder and the adjusting part of the needle winding to detect the force of the cylinder on the adjusting part of the needle winding in real time, so as to ensure the stability of the cylinder force, reduce the cell defect rate, and improve the performance consistency of lithium battery. This application uses an electric proportional valve to control the air pressure of the input cylinder. Compared with traditional on / off valves, the electric proportional valve adopts closed-loop control combined with sensor feedback to dynamically compensate for load changes, maintain stable output, and has higher control accuracy, effectively avoiding cell quality problems caused by improper cylinder force.

[0015] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the adjustable needle winding device in this embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the coiling needle in an embodiment of this utility model; Figure 3 This is a schematic diagram of the connecting plate and adjusting plate in an embodiment of this utility model.

[0018] The reference numerals in the above figures are as follows: 1. Cylinder; 11. Base plate; 2. Pressure sensor; 21. First clamping plate; 22. Second clamping plate; 3. Drive rod; 31. Limiting block; 32. Spring; 33. Connector; 4. Guide cylinder; 41. Connecting part; 51. First winding needle; 52. Second winding needle; 61. First connecting plate; 62. Second connecting plate; 71. First adjusting plate; 72. Second adjusting plate; 8. First inclined plane; 9. Second inclined plane. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] Example: This example discloses a needle winding device with adjustable outer circumference, comprising: A cylinder 1 is fixed to a base plate 11, which is used to fix the cylinder 1 to the frame of the electrode winding device. The cylinder 1 is connected to an electro-proportional valve, which controls the air pressure input to the cylinder 1. The electro-proportional valve uses closed-loop control combined with sensor feedback to dynamically compensate for load changes and maintain output stability, enabling precise control of the cylinder force. Furthermore, the electro-proportional valve has a fast response speed, which helps improve the working efficiency of the electrode winding device.

[0022] like Figure 1 As shown, a first clamping plate 21 is connected to the end of the telescopic rod of the cylinder 1. A pressure sensor 2 is connected to the side of the first clamping plate 21 opposite to the cylinder 1, and a second clamping plate 22 is connected to the side of the pressure sensor 2 opposite to the first clamping plate 21. Both the first clamping plate 21 and the second clamping plate 22 are perpendicular to the telescopic rod of the cylinder 1.

[0023] A drive rod 3 is provided on the side of the second clamping plate 22 opposite to the pressure sensor 2, and the drive rod 3 is perpendicular to the second clamping plate 22. Initially, the drive rod 3 and the second clamping plate 22 are in contact.

[0024] A guide cylinder 4 is sleeved on the drive rod 3, and the guide cylinder 4 has a guide channel extending along the axial direction of the drive rod 3. The guide cylinder 4 has a connecting part 41, which is used to fix the guide cylinder 4 to the frame of the electrode winding device.

[0025] A limiting block 31 is provided at one end of the drive rod 3 near the second clamping plate 22. A spring 32 is sleeved on the drive rod 3, with one end of the spring 32 connected to the limiting block 31 and the other end of the spring 32 connected to the guide cylinder 4. Under the action of the spring 32, the drive rod 3 remains in contact with the second clamping plate 22.

[0026] In some feasible embodiments, the drive rod 3 and the second clamping plate 22 are connected. With this technical solution, the drive rod 3 can increase the outer circumference of the coiling needle as the telescopic rod of the cylinder 1 extends, and can also retract as the telescopic rod of the cylinder 1 contracts. The guide cylinder 4 can be replaced with a guide rail extending axially along the drive rod 3. The guide rail is equipped with a slider, and the slider is fixedly connected to the drive rod 3. The guide rail ensures that the drive rod 3 can only move along its axial direction, so as to ensure that the force of the cylinder 1 is fully applied to the adjusting member.

[0027] The drive rod 3 has a connector 33 at its end opposite to the second clamping plate 22. The connector 33 is used to connect to the adjustment device of the coiling needle. Figure 2 , 3 As shown, the winding needle includes two opposing first winding needles 51 and second winding needles 52. The first winding needles 51 and second winding needles 52 are respectively connected to two adjusting devices. The adjusting device includes a connector connected to the winding needle and an adjusting member disposed on the side of the connector opposite to the winding needle. In this application, the first winding needle 51 is connected to a first connecting plate 61, with winding needles extending from both ends of the first connecting plate 61. The side of the first connecting plate 61 opposite to the first winding needle 51 is provided with two spaced-apart first inclined surfaces 8. The side of the first connecting plate 61 opposite to the first winding needle 51 is provided with a first adjusting plate 71. The side of the first adjusting plate 71 facing the first connecting plate 61 is provided with two second inclined surfaces 9 that respectively fit against the first inclined surfaces 8. The first adjusting plate 71 is connected and fixed to the connector 33 of the drive rod 3.

[0028] The second winding needle 52 is connected to a second connecting plate 62, with winding needles extending from both ends of the second connecting plate 62. The side of the second connecting plate 62 facing away from the second winding needle 52 has two spaced-apart first inclined surfaces 8. A second adjusting plate 72 is also provided on the side of the second connecting plate 62 facing away from the second winding needle 52. The side of the second adjusting plate 72 facing the second connecting plate 62 has two second inclined surfaces 9 that respectively conform to the first inclined surfaces 8. The second adjusting plate 72 is connected and fixed to the connector 33 of the drive rod 3.

[0029] It should be noted that the first winding needle 51, the second winding needle 52, or the first connecting plate 61 and the second connecting plate 62 are connected to a guide mechanism extending radially along the winding needle. An elastic element is provided between the guide mechanism and the first winding needle 51, the second winding needle 52, or the first connecting plate 61 and the second connecting plate 62. Under the action of the elastic element, the first winding needle 51, the second winding needle 52, or the first connecting plate 61 and the second connecting plate 62 move toward the first adjusting plate 71 or the second adjusting plate 72.

[0030] This application also includes a PLC-controlled machine, wherein the electro-proportional valve and pressure sensor 2 are connected to the PLC controller.

[0031] Through the above technical solution, the operator only needs to input the required force on the controller. The PLC controller outputs a corresponding electrical signal based on the magnitude of the force and transmits it to the electro-proportional valve. The electro-proportional valve adjusts the output air pressure to drive the cylinder 1. Driven by the cylinder 1, the drive rod 3 moves towards the winding needle, thereby pushing the first adjusting plate 71 and the second adjusting plate 72 to move along the axial direction of the winding needle. Under the action of the first inclined surface 8 and the second inclined surface 9, the first connecting plate 61 and the second connecting plate 62 move outward along the radial direction of the winding needle, thereby increasing the outer circumference of the winding needle. The force exerted by the cylinder 1 on the drive rod 3 can be read by the pressure sensor 2. It can be understood that maintaining the force exerted by the cylinder 1 on the drive rod 3 can keep the outer circumference of the winding needle constant. With the output stability and precise control force of the electro-proportional valve, cell quality problems caused by improper force can be avoided, reducing the cell defect rate and improving the performance consistency of lithium batteries. With the pressure sensor 2 providing real-time feedback on the force of the cylinder 1, the winding needle is stabilized, reducing the cell defect rate and improving the performance consistency of lithium batteries.

[0032] When the telescopic rod of the cylinder 1 retracts to the point where it exerts no force on the drive rod 3, the coiling needle tends to maintain the state of minimum outer circumference under the action of the spring 32 and the elastic element.

[0033] This application also discloses an electrode winding device, which includes the aforementioned adjustable outer circumference winding needle device, wherein the base plate 11 and the connecting part 41 are mounted on the frame of the electrode winding device.

[0034] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A needle winding device with adjustable outer circumference, characterized in that, include: cylinder; The coiling needle has at least two coiling needles arranged side by side along the circumferential direction. At least one coiling needle is connected to a connector. The connector has a first inclined surface on the side away from the coiling needle. The connector has an adjusting component on the side away from the coiling needle. The adjusting component has a second inclined surface that fits against the first inclined surface. A drive rod, one end of which is connected to the adjusting member, and the other end of which faces the telescopic rod of the cylinder. Under the drive of the cylinder, the drive rod pushes the adjusting member to move axially along the needle coil, so as to push the needle coil to move radially along the connecting member. A pressure sensor is disposed between the extension rod of the cylinder and the drive rod.

2. The needle winding device with adjustable outer circumference as described in claim 1, characterized in that, It also includes an electro-proportional valve, which is connected to the cylinder.

3. The needle winding device with adjustable outer circumference as described in claim 1, characterized in that, It also includes a guide cylinder having a channel extending axially along the drive rod, the drive rod passing through the channel.

4. The needle winding device with adjustable outer circumference as described in claim 3, characterized in that, A first elastic element is provided between the guide cylinder and the drive rod. Under the action of the first elastic element, the drive rod moves relative to the guide cylinder toward the cylinder.

5. The needle winding device with adjustable outer circumference as described in claim 1, characterized in that, The drive rod and the pressure sensor are connected to the side opposite to the cylinder.

6. The needle winding device with adjustable outer circumference as described in claim 5, characterized in that, It also includes a guide rail extending axially along the drive rod, the guide rail having a slider, the slider being fixedly connected to the drive rod.

7. The needle winding device with adjustable outer circumference as described in claim 2, characterized in that, It also includes a controller, and the pressure sensor and the electro-proportional valve are respectively connected to the controller.

8. The needle winding device with adjustable outer circumference as described in claim 1, characterized in that, The connector is connected to a guide mechanism that extends radially along the needle winding. A second elastic element is provided between the guide mechanism and the connector. Under the action of the second elastic element, the connector moves toward the adjusting element.

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