A detection device for dry coating

Abstract

The application relates to the technical field of battery detection, in particular to a detection equipment for dry coating, which comprises a mounting frame, an adjusting module, a detection module and a driving module, the adjusting module is slidably connected to the mounting frame; the adjusting module comprises a swing sliding table and a linear sliding table; the detection module is installed on the adjusting module, the detection module comprises a first non-contact sensor and a second non-contact sensor, the first non-contact sensor is used for measuring the distance D between the first non-contact sensor and a back roller; the second non-contact sensor is used for measuring the distance d between the second non-contact sensor and a sheet flowing through the back roller; the driving module is arranged on the mounting frame and connected with the adjusting module, and is used for driving the adjusting module to move; the swing sliding table is used for adjusting the measurement angle of the detection module; and the linear sliding table is used for adjusting the distance between the detection module and an electrode sheet to the measurable area. The application can realize single-end installation detection, and avoids the problem that the space is limited during detection.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and more specifically to a testing device for dry coating. Background Technology

[0002] In dry coating processes for battery production, a pressed dry powder mixture is applied to the current collector. The thickness of this coating directly affects the performance of the final battery. An excessively thick coating prolongs the lithium-ion diffusion path, reducing the battery's rate performance and cycle life; an excessively thin coating may expose parts of the current collector, increasing the risk of internal short circuits and reducing the amount of active material, directly impacting the battery's energy density. Therefore, achieving real-time, high-precision measurement of coating thickness during dry coating is crucial for ensuring electrode consistency and reducing production scrap rates.

[0003] In related technologies, laser beam testing is used to detect the thickness of electrodes. However, laser beam testing relies on the transmitter and receiver being placed on both sides of the electrode to form an optical path. The thickness is calculated by the amount of laser beam blocked by the coating. However, due to the characteristics of dry coating process and equipment structure, there is not enough space around the dry coating equipment for laser beam testing, which affects the accuracy of the test. Utility Model Content

[0004] This application provides a testing device for dry coating, which can solve the above-mentioned technical problems.

[0005] According to a first aspect, this application provides a testing device for dry coating, comprising:

[0006] Mounting rack;

[0007] An adjustment module is slidably connected to the mounting bracket; the adjustment module includes a swing slide and a linear slide.

[0008] A detection module, installed on the adjustment module, includes a first non-contact sensor and a second non-contact sensor. The first non-contact sensor measures the distance D between itself and the back roller; the second non-contact sensor measures the distance d between itself and the sheet flowing through the back roller.

[0009] A drive module is disposed on the mounting bracket and connected to the adjustment module for driving the adjustment module to move;

[0010] The swing slide is used to adjust the measurement angle of the detection module; the linear slide is used to adjust the detection module to the measurable area and adjust the distance between the detection module and the sheet.

[0011] In some alternative embodiments, the first non-contact sensor and the second non-contact sensor are coaxially arranged, and the measurement starting points of the first non-contact sensor and the second non-contact sensor are aligned.

[0012] In some alternative embodiments, the first non-contact sensor includes an eddy current sensor; and / or, the second non-contact sensor includes a capacitive sensor.

[0013] In some alternative embodiments, the swing slide and the linear slide are connected, with one of the swing slide and the linear slide slidably connected to the mounting bracket and the other connected to the detection module.

[0014] In some alternative embodiments, the detection device further includes a guide assembly disposed on the mounting bracket and connected to the adjustment module.

[0015] In some alternative embodiments, the guide assembly includes a slide rail and a slider, the slide rail being mounted on the mounting bracket, the slider being slidably mounted on the slide rail, and connected to the adjustment module.

[0016] In some optional embodiments, the drive module includes a drive motor and a transmission unit, the transmission unit being disposed at the output end of the drive motor and connected to the adjustment module.

[0017] According to a second aspect, this application provides a testing device for dry coating, comprising:

[0018] Base;

[0019] Mounting bracket, which is slidably connected to the base;

[0020] An adjustment module is disposed on the mounting frame, and the adjustment module includes a swing slide and a linear slide.

[0021] The detection module includes a first non-contact sensor and a second non-contact sensor. The first non-contact sensor measures the distance D between itself and the back roller; the second non-contact sensor measures the distance d between itself and the sheet flowing through the back roller.

[0022] A drive module is mounted on the base and connected to the mounting bracket, and is used to drive the mounting bracket to move;

[0023] The swing slide is used to adjust the measurement angle of the detection module; the linear slide is used to adjust the detection module to the measurable area and adjust the distance between the detection module and the sheet.

[0024] In some alternative embodiments, the detection device further includes a guide assembly disposed on the base and connected to the mounting bracket.

[0025] In some alternative embodiments, the guide assembly includes a slide rail and a slider, the slide rail being mounted on the base, the slider being slidably mounted on the slide rail, and connected to the mounting bracket.

[0026] The detection device for dry coating according to this embodiment includes a mounting frame, an adjustment module, a detection module, and a drive module. The drive module can drive the adjustment module to move, thereby driving the detection module to move. The adjustment module includes a swing slide and a linear slide. The swing slide is used to adjust the measurement angle of the detection module; the linear slide is used to adjust the detection module to the measurable area and adjust the distance between the detection module and the electrode, allowing for precise adjustment of the relative position between the detection module and the electrode to improve detection accuracy. Since the detection module includes two non-contact sensors, detection can be achieved through single-end mounting, avoiding the space-constrained problem of laser-based detection in related technologies. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a detection device for dry coating in one embodiment, viewed from one angle.

[0028] Figure 2 This is a schematic diagram of the structure of a detection device for dry coating in one embodiment from another angle;

[0029] Figure 3 for Figure 2 A magnified view of a portion of point P in the middle;

[0030] Figure 4 This is a schematic diagram of the structure of a detection device for dry coating in use in one embodiment;

[0031] Figure 5 This is a schematic diagram of the detection module in one embodiment;

[0032] Figure 6 This is a schematic diagram of the structure of a testing device for dry coating in another embodiment.

[0033] Among them: 1. Testing equipment;

[0034] 10. Mounting bracket;

[0035] 20. Adjustment module; 21. Swing slide; 211. Rotary seat; 212. Swing drive assembly; 22. Linear slide; 221. Mounting base; 222. Linear drive assembly;

[0036] 30. Detection module; 31. First non-contact sensor; 32. Second non-contact sensor;

[0037] 40. Drive module; 41. Drive motor; 42. Transmission unit; 421. Synchronous belt; 422. Input pulley; 423. Output pulley;

[0038] 50. Guide assembly; 51. Slide rail; 52. Slider;

[0039] 60. Base;

[0040] 2. Electrode;

[0041] 3. Back roller;

[0042] X, the first direction; Y, the second direction. Detailed Implementation

[0043] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0044] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0045] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0046] In this application, the term "dry coating" refers to the process of "transferring" or "forming" a coating onto a substrate surface through mechanical force, heat, or physical adsorption, followed by curing (e.g., cooling, heating, pressurization, radiation) to form a continuous and uniform coating. This coating can be a pre-pressed dry powder mixture.

[0047] The dry coating testing equipment 1 can be used in conjunction with the sheet coating mechanism. It is mainly used to measure the thickness of the sheet flowing through the coating mechanism. The sheet can be an electrode 2 or a film, etc.

[0048] The coating mechanism includes a back roller 3 and a coating head. The back roller 3 is typically arranged parallel to the opposite side of the coating head. When the current collector (aluminum foil or copper foil) and the dry powder mixture pass through the coating area, the back roller 3, through precise cooperation with the coating head, provides stable support and pressure for the electrode 2 and can transport the electrode 2. The back roller 3 is generally a metal roller, utilizing its high strength, smooth surface, and conductive properties to ensure the stability, accuracy, and quality of the electrode 2 transport.

[0049] The term "electrode 2" refers to battery electrode 2, which generally includes a current collector and an electrode coating disposed on the current collector. The thickness of the electrode coating affects the performance of the final produced battery (including lithium-ion batteries, sodium-ion batteries, etc.), and the thickness of the electrode coating needs to be measured accurately.

[0050] This application provides a dry coating testing device 1 (hereinafter referred to as "testing device 1"), which works in conjunction with a coating mechanism to measure the thickness of a sheet (such as an electrode 2), thereby determining the coating thickness on the sheet. For example, the thickness of the electrode coating can be determined based on the thickness of the electrode 2 and the current collector thickness of the electrode 2. The electrode 2 will be used as an example for detailed description below.

[0051] Please see Figures 1 to 6 The testing device 1 includes a mounting frame 10, an adjustment module 20, a testing module 30, and a drive module 40.

[0052] The mounting frame 10 can be constructed as an assembly of multiple components, serving as a support structure for the entire testing device 1. Alternatively, it can be understood that the adjustment module 20, the testing module 30, and the drive module 40 are all connected to the mounting frame 10. This connection includes direct and indirect connections. For example, the adjustment module 20 can be directly connected to the mounting frame 10; the drive module 40 can be directly connected to the mounting frame 10; and the testing module 30 can be indirectly connected to the mounting frame 10 through the adjustment module 20.

[0053] In some embodiments, the adjustment module 20 is slidably connected to the mounting bracket 10. The adjustment module 20 includes a swing slide 21 and a linear slide 22. The swing slide 21 is used to adjust the measurement angle of the detection module 30. The linear slide 22 is used to adjust the detection module 30 to the measurable area and adjust the distance between the detection module 30 and the electrode 2.

[0054] In this application, the term "measurable area" refers to the area corresponding to the included angle formed by the two tangent points of the electrode 2 and the back roller 3.

[0055] Please see Figure 3 The swing slide 21 includes a rotating base 211 and a swing drive assembly 212. The detection module 30 is connected to the rotating base 211. The swing drive assembly 212 can drive the rotating base 211 to rotate around its central axis, thereby driving the detection module 30 to rotate and changing the measurement angle of the detection module 30 during detection, so that the detection direction of the detection module 30 is always perpendicular to the surface of the electrode 2, avoiding the impact of angle error on the accuracy of measurement.

[0056] In some embodiments, the oscillation drive assembly 212 includes a rotary motor, the output of which is connected to the rotating base 211, and the rotary motor directly drives the rotating base 211 to rotate. The oscillation drive assembly 212 may also include a cylinder, which pushes the rotating base 211 to tilt relative to the mounting bracket 10 so that the detection module 30 can detect from a direction perpendicular to the surface of the electrode 2.

[0057] Please continue reading. Figure 3 The linear slide 22 includes a mounting base 221 and a linear drive assembly 222. The detection module 30 is connected to the mounting base 221. The linear drive assembly 222 can drive the mounting base 221 to move linearly, thereby driving the detection module 30 to the measurable area and changing the distance between the detection module 30 and the electrode 2 within the measurable area to improve measurement accuracy. The linear drive assembly 222 can be a linear motor or a cylinder.

[0058] Please see Figure 1 and Figure 2 The detection module 30 is installed on the adjustment module 20. The detection module 30 includes a first non-contact sensor 31 and a second non-contact sensor 32. The first non-contact sensor 31 is used to measure the distance D between itself and the back roller 3; the second non-contact sensor 32 is used to measure the distance d between itself and the sheet flowing through the back roller 3. Based on the distance between the first non-contact sensor 31 and the second non-contact sensor 32, or the difference in distance between the first non-contact sensor 31 and the second non-contact sensor 32 and the back roller 3, and the measured D and d, the thickness of the electrode 2 can be calculated, thereby calculating the thickness of the electrode coating. For example, if the distance difference between the first non-contact sensor 31 and the second non-contact sensor 32 and the back roller 3 is d1, then the thickness of the electrode 2 is h = D - d1 - d. The first non-contact sensor 31 and the second non-contact sensor 32 can be installed at one end, without the need to set up installation space on the opposite side of the electrode 2 or reserve an optical path between the two sides of the electrode 2. This can solve the problem of laser beam detection being limited by the surrounding space of the coating equipment in related technologies.

[0059] The drive module 40 is mounted on the mounting frame 10 and connected to the adjustment module 20. It is used to drive the adjustment module 20 to move, thereby driving the detection module 30 connected to the adjustment module 20 to move, so as to change the position of the detection mold and set it on one side of the back roller 3.

[0060] For ease of description and to distinguish the directions of motion, the direction of motion of the detection module 30 is defined as the first direction X, and the direction of motion of the linear slide 22 driving the detection module 30 is defined as the second direction Y. In some embodiments, the first direction X and the second direction Y are perpendicular to each other.

[0061] Please see Figure 5 In some embodiments, the first non-contact sensor 31 and the second non-contact sensor 32 are coaxially arranged, which can reduce the installation area occupied, avoid interference with structures such as the coating head and back roller 3, and also concentrate the measurement areas of the first non-contact sensor 31 and the second non-contact sensor 32, ensuring that the measurement points (spots, measurement areas) of the two sensors fall on the same position of the target object (roller surface or electrode surface), eliminating the interference of spatial position deviation on the measurement, and also reducing the interference on the measurement results when the target object is tilted, thereby improving the accuracy of the measurement results. The measurement starting points of the first non-contact sensor 31 and the second non-contact sensor 32 are flush, that is, the probe end faces of the first non-contact sensor 31 and the second non-contact sensor 32 are set on the same plane (coplanar), and the distance from the probe end face to the back roller 3 is the same, which can also be understood as the distance difference between the first non-contact sensor 31 and the second non-contact sensor 32 and the back roller 3 is 0. For example, the probe ends of the first non-contact sensor 31 and the second non-contact sensor 32 are both located on the plane where point A is in the figure. The first non-contact sensor 31 and the second non-contact sensor 32 both start measuring from the plane where A is located. The measurement area of ​​the first non-contact sensor 31 is the area from A to B, where D is the vertical straight-line distance from A to B. The measurement area of ​​the second non-contact sensor 32 is the area from A to C, where d is the vertical straight-line distance from A to C. Based on this, the thickness of the electrode 2 is h = Dd. The first non-contact sensor 31 and the second non-contact sensor 32 are coaxially arranged, which can effectively ensure that the thickness of the electrode 2 to be measured is the vertical distance difference at the same position, rather than the oblique distance difference caused by the offset of the measurement point.

[0062] In some embodiments, the measurement areas of the first non-contact sensor 31 and the second non-contact sensor 32 may at least partially overlap. (See also...) Figure 5 The overlapping area of ​​the first non-contact sensor 31 and the second non-contact sensor 32 is the area from the end face of the second non-contact sensor 32 to the plane where C is located.

[0063] In other embodiments, the measurement areas of the first non-contact sensor 31 and the second non-contact sensor 32 may not overlap. The projection of the end face of the second non-contact sensor 32 onto the plane where A is located is an annular surface, and the first non-contact sensor 31 is a circular surface disposed within the annular surface. Although the two are coaxial, there is no overlapping area.

[0064] In some embodiments, the first non-contact sensor 31 includes an eddy current sensor; and / or, the second non-contact sensor 32 includes a capacitive sensor. Both the first and second non-contact sensors 31 are used to measure distance. The principle of distance measurement by the eddy current sensor is based on electromagnetic induction and the eddy current effect. Specifically, the eddy current sensor includes a probe with a coil inside. This coil is excited by a high-frequency alternating current (typically 10kHz-1MHz). The impedance of the coil is affected by the distance between the probe and the conductor being measured (back roller 3). The eddy current sensor can convert the change in coil impedance into an electrical signal, which, after calibration, can be used to obtain the distance D between the probe and the conductor being measured (back roller 3). The capacitive sensor uses the characteristic that the capacitance of a parallel plate capacitor is inversely proportional to the distance between the plates to measure distance. The capacitive sensor includes plates that can be adjusted to be parallel to the electrode 2 via the adjustment module 20. The electrode 2 is used as the other plate in the parallel plate capacitor. The capacitance value is ultimately converted into the distance d between the capacitive sensor and the electrode 2. In these embodiments, the use of eddy current sensors and capacitance sensors for distance measurement reduces the layout of the detection module 30. By directly using the object being measured as part of the sensor, the volume occupied by the detection module 30 can be effectively reduced, and the requirements for the detection environment can be lowered, overcoming the limitation of limited peripheral space in existing dry coating equipment. Simultaneously, the eddy current sensors and capacitance sensors enable non-contact, indirect calculation of coating thickness, reducing damage to the electrode coating. This allows for high-precision, non-destructive real-time detection within a limited space, providing crucial data support for the dynamic adjustment of dry coating process parameters, ultimately ensuring the consistency and reliability of the battery electrode 2. The eddy current sensors and capacitance sensors also have strong environmental interference resistance, especially against dust and other pollutants present during the dry coating process.

[0065] In other embodiments, the first non-contact sensor 31 and the second non-contact sensor 32 may also be ultrasonic sensors or infrared sensors.

[0066] In some embodiments, the swing slide 21 and the linear slide 22 are connected, with one of them slidably connected to the mounting bracket 10 and the other connected to the detection module 30. Since the swing slide 21 and the linear slide 22 are used to adjust the measurement angle and position of the detection module 30 in the second direction Y, they can move as a whole relative to the mounting bracket 10 along the first direction X. Therefore, after they are connected, as long as one is connected to the mounting bracket 10, synchronous movement along the first direction X can be achieved; and after the other is connected to the detection module 30, this connection relationship can achieve both the adjustment of the measurement angle and displacement in the second direction Y. For a specific example, please refer to [further details]. Figure 3 The swing slide 21 is slidably connected to the mounting bracket 10, the swing slide 21 is connected to the linear slide 22, and the detection module 30 is connected to the linear slide 22. In other examples, the linear slide 22 is slidably connected to the mounting bracket 10, the swing slide 21 is connected to the linear slide 22, and the detection module 30 is connected to the swing slide 21.

[0067] In some embodiments, the detection device 1 further includes a guide component 50, which is disposed on the mounting frame 10 and connected to the adjustment module 20. The guide component 50 guides the sliding of the detection module 30 relative to the mounting frame 10, making it more stable and accurate.

[0068] In some embodiments, the guide assembly 50 includes a slide rail 51 and a slider 52. The slide rail 51 is mounted on the mounting bracket 10 and extends along a first direction X. The slider 52 is slidably mounted on the slide rail 51 and connected to the adjustment module 20. Of course, in other embodiments, the slide rail 51 may also be mounted on the adjustment module 20, and the slider 52 may be mounted on the mounting bracket 10.

[0069] In some embodiments, the drive module 40 includes a drive motor 41 and a transmission unit 42. The transmission unit 42 is disposed at the output end of the drive motor 41 and is connected to the adjustment module 20.

[0070] In some embodiments, the transmission unit 42 includes a timing belt 421, an input pulley 422, and an output pulley 423. The input pulley 422 and the output pulley 423 are spaced apart on the mounting frame 10 along a first direction X. The input pulley 422 is located at the output end of the drive motor 41. The timing belt 421 is located between the input pulley 422 and the output pulley 423 along the first direction X. The adjustment module 20 is connected to the timing belt 421 so that the input pulley 422 is driven to rotate by the rotation of the drive motor 41, and the timing belt 421 is driven to transmit power between the input pulley 422 and the output pulley 423, thereby driving the adjustment module 20 to move along the first direction X.

[0071] In other embodiments, the transmission unit 42 includes a lead screw and a connecting block. The lead screw is connected to the output end of the drive motor 41 and extends along the first direction X. The connecting block is movably disposed on the lead screw and is connected to the adjustment module 20. When the drive motor 41 rotates, it drives the lead screw to rotate and drives the connecting block to move along the axial direction (first direction X) of the lead screw, thereby driving the adjustment module 20 to move along the first direction X.

[0072] Please see Figure 6 In some embodiments, the detection device 1 further includes a base 60, a mounting frame 10 slidably connected to the base 60, an adjustment module 20 disposed on the mounting frame 10, and a drive module 40 connected to the mounting frame 10, thereby driving the mounting frame 10 to move relative to the base 60 along the first direction X, and simultaneously driving the adjustment module 20 and the detection module 30 disposed on the mounting frame 10 to move along the first direction X. In these embodiments, the adjustment module 20 is either fixed to the mounting frame 10 or slidably connected to the mounting frame 10.

[0073] In some embodiments, a guide assembly 50 is provided between the mounting bracket 10 and the base 60 to guide the relative movement between the mounting bracket 10 and the base 60. The guide assembly 50 includes a slide rail 51 and a slider 52. In one specific example, the slide rail 51 is mounted on the base 60 and extends along a first direction X, and the slider 52 is slidably mounted on the slide rail 51 and connected to the mounting bracket 10. Of course, in another specific example, the slider 52 may also be mounted on the mounting bracket 10 and connected to the base 60.

[0074] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A testing device for dry coating, characterized in that, include: Mounting rack; An adjustment module, which is slidably connected to the mounting bracket; The adjustment module includes a swing slide and a linear slide; The detection module is installed on the adjustment module. The detection module includes a first non-contact sensor and a second non-contact sensor. The first non-contact sensor is used to measure the distance D between itself and the back roller; the second non-contact sensor is used to measure the distance d between itself and the sheet flowing through the back roller. as well as A drive module is disposed on the mounting bracket and connected to the adjustment module for driving the adjustment module to move; The swing slide is used to adjust the measurement angle of the detection module; the linear slide is used to adjust the detection module to the measurable area and adjust the distance between the detection module and the sheet.

2. The testing equipment for dry coating according to claim 1, characterized in that, The first non-contact sensor and the second non-contact sensor are coaxially arranged, and their measurement starting points are aligned.

3. The testing equipment for dry coating according to claim 1, characterized in that, The first non-contact sensor includes an eddy current sensor; and / or, the second non-contact sensor includes a capacitive sensor.

4. The testing equipment for dry coating according to claim 1, characterized in that, The swing slide and the linear slide are connected, with one of the swing slide and the linear slide slidably connected to the mounting bracket and the other connected to the detection module.

5. The testing equipment for dry coating according to claim 1, characterized in that, The testing equipment also includes a guide assembly, which is disposed on the mounting frame and connected to the adjustment module.

6. The testing equipment for dry coating according to claim 5, characterized in that, The guide assembly includes a slide rail and a slider. The slide rail is mounted on the mounting bracket, and the slider is slidably mounted on the slide rail and connected to the adjustment module.

7. The testing equipment for dry coating according to claim 1, characterized in that, The drive module includes a drive motor and a transmission unit. The transmission unit is located at the output end of the drive motor and is connected to the adjustment module.

8. A testing device for dry coating, characterized in that, include: Base; Mounting bracket, which is slidably connected to the base; An adjustment module is disposed on the mounting frame, and the adjustment module includes a swing slide and a linear slide. The detection module includes a first non-contact sensor and a second non-contact sensor. The first non-contact sensor is used to measure the distance D between itself and the back roller; the second non-contact sensor is used to measure the distance d between itself and the sheet flowing through the back roller. as well as A drive module is mounted on the base and connected to the mounting bracket, and is used to drive the mounting bracket to move; The swing slide is used to adjust the measurement angle of the detection module; the linear slide is used to adjust the detection module to the measurable area and adjust the distance between the detection module and the sheet.

9. The testing equipment for dry coating according to claim 8, characterized in that, The testing equipment also includes a guide assembly, which is disposed on the base and connected to the mounting bracket.

10. The testing equipment for dry coating according to claim 9, characterized in that, The guide assembly includes a slide rail and a slider. The slide rail is mounted on the base, and the slider is slidably mounted on the slide rail and connected to the mounting bracket.

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