Cold pressing mechanism and battery production line

Abstract

A cold pressing mechanism and a battery production line. The cold pressing mechanism comprises a rolling assembly, an elongation assembly, and elongation measurement assemblies which are distributed in sequence. The rolling assembly is configured to perform cold pressing on coating areas of an electrode sheet. The elongation assembly is configured to elongate blank areas of the electrode sheet. The elongation measurement assemblies are configured to measure the elongation rate of the electrode sheet having undergone cold pressing and elongation. The elongation measurement assemblies comprise first distance measurement elements and second distance measurement elements; the first distance measurement elements and the second distance measurement elements are arranged on the same side of the electrode sheet in the thickness direction; the first distance measurement elements and the second distance measurement elements are distributed at intervals in the width direction of the electrode sheet; the first distance measurement elements are configured to measure the distance between the first distance measurement elements and the blank areas of the electrode sheet; and the second distance measurement elements are configured to measure the distance between the second distance measurement elements and the coating areas of the electrode sheet. For a battery production line comprising the cold pressing mechanism, online measurement of the elongation rate of the electrode sheet can be performed.

Description

Cold pressing mechanism and battery production line

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202421441286.2, filed on June 21, 2024, entitled “Cold Pressing Mechanism and Battery Production Line,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a cold pressing mechanism and a battery production line. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] In the battery manufacturing process, it is often necessary to roll the electrode strip. After the rolling operation is completed, the elongation of the electrode needs to be tested. However, at present, most of the elongation testing of the electrode is done offline by manual measurement, which cannot be done online, resulting in low elongation testing efficiency.

[0006] Summary of the Invention

[0007] This application provides a cold pressing mechanism and a battery production line that can detect the elongation of the electrode sheets online.

[0008] This application is achieved through the following technical solution:

[0009] In a first aspect, embodiments of this application provide a cold pressing mechanism, which includes a rolling assembly, an extension assembly, and an extension measurement assembly arranged sequentially. The rolling assembly is used to cold press the coating area of ​​the electrode sheet, the extension assembly is used to extend the blank area of ​​the electrode sheet, and the extension measurement assembly is used to detect the elongation rate of the electrode sheet after cold pressing and extension. The extension measurement assembly includes a first measuring element and a second measuring element, which are disposed on the same side of the thickness direction of the electrode sheet and are spaced apart along the width direction of the electrode sheet. The first measuring element is used to measure the distance between the first measuring element and the blank area of ​​the electrode sheet, and the second measuring element is used to measure the distance between the second measuring element and the coating area of ​​the electrode sheet.

[0010] In the technical solution of this application embodiment, the unwound electrode sheet enters a rolling assembly for cold pressing, compacting the coating area of ​​the electrode sheet to a preset thickness. The cold-pressed electrode sheet then passes through an extension assembly, which extends the blank area of ​​the electrode sheet. After the blank area is extended, the electrode sheet passes through an extension measurement assembly, which can measure the relative elongation rate of the coating area and the blank area of ​​the electrode sheet in real time. The extension measurement assembly includes a first measuring element and a second measuring element, located on the same side of the electrode sheet's thickness direction and spaced apart along the electrode sheet's width direction. The first measuring element faces the blank area of ​​the electrode sheet, and the second measuring element faces the coating area of ​​the electrode sheet. The first measuring element measures the distance between itself and the blank area of ​​the electrode sheet, and the second measuring element measures the distance between itself and the coating area of ​​the electrode sheet. The first and second ranging elements are simultaneously and continuously measured multiple times to determine the distance between the blank area and the coating area of ​​the electrode and the corresponding ranging element. After the measured data is calculated and analyzed, the relative elongation of the blank area and the coating area of ​​the electrode during that period can be characterized.

[0011] The principle for calculating the relative elongation of the blank area and the coating area of ​​the electrode is as follows: taking the distance between the first measuring element and the blank area of ​​the electrode as ab, and the distance between the second measuring element and the coating area of ​​the electrode as ac, the relative elongation of the blank area and the coating area of ​​the electrode can be characterized by various calculation methods. Two methods are listed below for explanation.

[0012] The first method involves calculating the relative displacement bc between the coating area and the blank area of ​​the electrode based on the distance ab measured by the first ranging element and the distance ac measured by the second ranging element, i.e., bc = ac - ab. Statistical data from the extension measurement component over a certain time period is then used. If the relative displacement bc is within a first preset range, it indicates that the relative extension of the coating area and the blank area of ​​the electrode meets the requirements. When the relative displacement bc is outside this first preset range, the extension setting tension of the extension mechanism is adjusted accordingly. For example, if the relative displacement bc is greater than the maximum value of the first preset range, the extension data of the extension mechanism shows increased extension, so the extension setting tension of the extension mechanism is reduced. If the relative displacement bc is less than the minimum value of the first preset range, the extension data of the extension mechanism shows decreased extension, so the extension setting tension of the extension mechanism is increased.

[0013] The second method involves calculating the relative ratio α between ab and (ac - film thickness of the coating area) based on the distance ab measured by the first ranging element and the distance ac measured by the second ranging element. Statistical data from the stretching measurement component over a certain period is then used. When the relative ratio α fluctuates within a second preset range, it indicates that the relative stretching rate of the coating area and the blank area of ​​the electrode meets the requirements. If the relative ratio α is outside the second preset range, the stretching setting tension of the stretching mechanism is adjusted accordingly. For example, if the relative ratio α is greater than the maximum value of the second preset range, the stretching data of the stretching mechanism shows increased stretching, so the stretching setting tension of the stretching mechanism is reduced. If the relative ratio α is less than the minimum value of the second preset range, the stretching data of the stretching mechanism shows decreased stretching, so the stretching setting tension of the stretching mechanism is increased.

[0014] According to some embodiments of this application, there are multiple stretch measurement components, which are spaced apart along the width direction of the electrode.

[0015] In the above scheme, since the electrode can have multiple alternating coating areas and blank areas in its width direction, by setting the number of stretch measurement components to multiple, and distributing the multiple stretch measurement components at intervals along the width direction of the electrode, the multiple stretch measurement components can simultaneously measure the distance between the blank areas and coating areas at multiple different points in the width direction of the electrode. After the data is calculated and analyzed, the relative stretch rate data of the coating area and blank area of ​​the electrode is more comprehensive and accurate.

[0016] According to some embodiments of this application, there are multiple stretch measurement components, which are distributed on both sides of the electrode in the thickness direction, and the stretch measurement components located on both sides of the electrode in the thickness direction are arranged opposite each other.

[0017] In the above scheme, by setting extension measurement components on both sides of the electrode thickness direction, multiple sets of extension measurement components can work together to obtain the distance information of the coating area and the blank area on both sides of the electrode thickness direction. This allows for a more comprehensive calculation of the relative elongation rate of the blank area and the coating area on both sides of the electrode thickness direction, resulting in more comprehensive data and making it easier to visualize the electrode extension state data through software.

[0018] According to some embodiments of this application, the extension measurement assembly further includes a substrate, on which a first ranging element and a second ranging element are movably disposed.

[0019] In the above scheme, the first and second ranging elements are movably disposed on the substrate. The positions of the first and second ranging elements on the substrate can be adjusted according to actual needs, thereby adjusting the relative positions of the first and second ranging elements with the electrode. This enables distance measurement at different positions on the electrode, providing greater flexibility and a wider range of applications.

[0020] According to some embodiments of this application, a guide portion is provided on the substrate, the guide portion extends along the width direction of the electrode sheet, and at least one of the first ranging element and the second ranging element slides in cooperation with the guide portion.

[0021] In the above scheme, by setting the guide part, which extends along the width direction of the electrode, the guide part can guide and cooperate with the first ranging element and / or the second ranging element. By adjusting the relative position of the first ranging element and the second ranging element with the width direction of the electrode, the distance measurement of different points in the width direction of the electrode can be realized, which is highly flexible and has a wider range of applications.

[0022] According to some embodiments of this application, the extension measurement assembly further includes a drive member for driving the first ranging element and / or the second ranging element to move on the guide.

[0023] In the above solution, by setting the driving component, the driving component can drive the first ranging element and / or the second ranging element to move on the guide part, thereby adjusting the position of the first ranging element and the second ranging element on the substrate. No manual adjustment is required, and the degree of automation is high.

[0024] According to some embodiments of this application, the cold pressing mechanism further includes a controller, an extension measuring component and an extension component, both of which are electrically connected to the controller. The controller is used to control the tension of the tension roller in the extension component based on the data transmitted by the extension measuring component.

[0025] In the above scheme, through the settings of the controller, the controller can calculate, summarize and analyze the data transmitted by the stretching measurement component, and dynamically adjust the tension of the tension roller in the stretching component according to the stretching state of the electrode, so as to achieve the consistency of the stretching state of the electrode, reduce the frequency of abnormal problems caused by the stretching action of the electrode, eliminate the need for manual adjustment of the tension roller in the stretching component, achieve a higher degree of automation, and reduce the workload of the staff.

[0026] According to some embodiments of this application, the cold pressing mechanism further includes a limiting component, which is disposed on one side of the extension measuring component along the conveying direction of the electrode sheet. The limiting component is used to limit the amplitude of the vibration of the electrode sheet in its thickness direction.

[0027] In the above scheme, since the electrode sheet may vibrate during the transportation process, and the vibration of the electrode sheet will affect the measurement accuracy of the stretch measurement component, the stretch measurement component is equipped with a limit component in order to better obtain the distance information between the blank area and the coating area on the electrode sheet. The limit component can limit the electrode sheet when it passes the stretch measurement component to control the vibration amplitude of the electrode sheet in the thickness direction, thereby making the distance information between the coating area and the blank area of ​​the electrode sheet obtained by the stretch measurement component more accurate and with higher precision.

[0028] According to some embodiments of this application, the limiting component includes a mounting plate and two rollers. The two rollers are rotatably mounted on the mounting plate and are respectively disposed on both sides of the electrode sheet in the thickness direction for abutting against both sides of the electrode sheet in the thickness direction.

[0029] In the above scheme, the limiting component is mounted on the mounting plate in the form of rollers, with two rollers located on both sides of the electrode's thickness direction. Under the conveying action of the electrode, the rollers rotate, guiding and limiting the electrode's thickness direction on both sides. That is, the area between the two rollers limits the displacement of the electrode in its thickness direction, thereby effectively suppressing the vibration amplitude of the electrode in its thickness direction. This results in higher accuracy of the distance information between the coating area and the blank area of ​​the electrode obtained by the extension measurement component.

[0030] According to some embodiments of this application, the two rollers are staggered in the conveying direction of the electrode sheet.

[0031] In the above scheme, by distributing the two rollers in the same set of limiting components in the conveying direction of the electrode sheet in a staggered manner, the risk of particles falling off the coating area of ​​the electrode sheet is reduced compared to the two rollers being distributed directly opposite each other.

[0032] According to some embodiments of this application, the number of limiting components is set to multiple, and the multiple limiting components are distributed at intervals along the width direction of the electrode and / or along the conveying direction of the electrode.

[0033] In the above scheme, by setting the number of limiting components to multiple, multiple limiting components can work together to increase the number of limiting points on the electrode, thereby minimizing the probability of the extension measurement component's accuracy being affected by electrode vibration.

[0034] Secondly, embodiments of this application also provide a battery production line, which includes the cold pressing mechanism of any of the foregoing embodiments.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 is a schematic diagram of the cold pressing mechanism of some embodiments of this application;

[0038] Figure 2 is a schematic diagram of the structure of the extension measurement component according to some embodiments of this application;

[0039] Figure 3 is a structural schematic diagram of the extension measurement component from another angle in some embodiments of this application;

[0040] Figure 4 is a schematic diagram of the data measured by the extension measurement component in some embodiments of this application.

[0041] The accompanying drawings are not drawn to scale.

[0042] Marking Explanation: 100-Cold pressing mechanism; 10-Unwinding assembly; 11-Unwinding roller; 12-First guide roller; 13-Tape splicing platform; 20-Roll pressing assembly; 21-Cold pressing roller; 30-Extension assembly; 31-Tension swing roller; 32-Second guide roller; 40-Extension measuring assembly; 41-First distance measuring element; 42-Second distance measuring element; 43-Third distance measuring element; 44-Fourth distance measuring element; 45-Substrate; 46-Guide section; 50-Rewinding assembly; 51-Rewinding roller; 60-Limiting assembly; 61-Roller; 200-Electrode sheet; 201-Blank area; 202-Coating area. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0049] Currently, battery manufacturing often involves rolling electrode strips. Rolling cold-presses the coated area of ​​the electrode to reduce its thickness to a preset level. After rolling, the blank areas of the electrode are stretched using an extension assembly. The elongation of the stretched electrode is then measured to ensure consistency between the elongation of the coated and blank areas. However, current elongation measurement methods are mostly offline and manual, making online measurement impossible and resulting in low efficiency.

[0050] Based on the above considerations, in order to better detect the elongation of the electrode sheet, this application designs a cold pressing mechanism. The cold pressing mechanism includes an elongation measurement component, which includes a first measuring element and a second measuring element. The first measuring element and the second measuring element are disposed on the same side of the thickness direction of the electrode sheet, and the first measuring element and the second measuring element are distributed at intervals along the width direction of the electrode sheet. The first measuring element is used to measure the distance between the first measuring element and the blank area of ​​the electrode sheet, and the second measuring element is used to measure the distance between the second measuring element and the coating area of ​​the electrode sheet.

[0051] In this cold-pressing mechanism, the first ranging element measures the distance between itself and the blank area of ​​the electrode, while the second ranging element measures the distance between itself and the coating area of ​​the electrode. By simultaneously and continuously measuring the distances between the blank area and the coating area of ​​the electrode and their respective ranging elements multiple times, and then calculating and analyzing the measured data, the relative elongation of the blank area and the coating area of ​​the electrode during that time period can be characterized.

[0052] This application provides a cold pressing mechanism. Please refer to Figures 1, 2 and 3. Figure 1 is a structural schematic diagram of the cold pressing mechanism of some embodiments of this application; Figure 2 is a structural schematic diagram of the extension measurement component of some embodiments of this application; Figure 3 is a structural schematic diagram of the extension measurement component of some embodiments of this application from another angle. The cold pressing mechanism 100 includes a roller pressing assembly 20, an extension assembly 30, and an extension measuring assembly 40 arranged sequentially. The roller pressing assembly 20 is used to cold press the coating area 202 of the electrode 200, the extension assembly 30 is used to extend the blank area 201 of the electrode 200, and the extension measuring assembly 40 is used to detect the elongation rate of the electrode 200 after cold pressing and extension. The extension measuring assembly 40 includes a first measuring element 41 and a second measuring element 42. The first measuring element 41 and the second measuring element 42 are disposed on the same side of the thickness direction Z of the electrode 200, and the first measuring element 41 and the second measuring element 42 are distributed at intervals along the width direction X of the electrode 200. The first measuring element 41 is used to measure the distance between the first measuring element 41 and the blank area 201 of the electrode 200, and the second measuring element 42 is used to measure the distance between the second measuring element 42 and the coating area 202 of the electrode 200.

[0053] The coating area 202 of the electrode 200 refers to the area on the surface of the electrode 200 where the active material layer is coated, and the blank area 201 of the electrode 200 refers to the blank area on the surface of the electrode 200 where the active material layer is not coated.

[0054] Roller pressing assembly 20 refers to a cold pressing mechanism that cold presses the coating area 202 of the electrode 200. Extension assembly 30 refers to an extension mechanism that provides an extension function to the blank area 201 of the electrode 200.

[0055] The cold pressing mechanism 100 also includes an unwinding assembly 10 and a winding assembly 50. The unwinding assembly 10 includes an unwinding roller 11 and a plurality of first guide rollers 12. The electrode sheet 200 is wound on the unwinding roller 11 and gradually released from the unwinding roller 11. Then, guided by the plurality of first guide rollers 12, the electrode sheet 200 enters the rolling assembly 20. The rolling assembly 20 includes two oppositely distributed cold pressing rollers 21. Under the pressure of the cold pressing rollers 21, the coating area 202 of the electrode sheet 200 is compacted to a preset thickness. Then, the electrode sheet 200 enters the stretching assembly 30 through a plurality of second guide rollers 32. After the stretching assembly 30 stretches the blank area 201 of the electrode sheet 200, the electrode sheet 200 enters the stretching measurement assembly 40 for stretching rate measurement. After the stretching rate measurement, the electrode sheet 200 enters the winding roller 51 of the winding assembly 50 to complete the winding of the electrode sheet 200. A belt receiving platform 13 is also provided between the first roller 12 and the roller pressing assembly 20.

[0056] The thickness direction Z of electrode 200 refers to the direction in which the thickness of electrode 200 extends. The width direction X of electrode 200 refers to the direction perpendicular to the conveying direction of electrode 200 and parallel to the direction of the surface on which electrode 200 is located, and also perpendicular to the length direction of electrode 200.

[0057] The first ranging element 41 and the second ranging element 42 can be various ranging elements, such as ranging sensors, lasers, etc.

[0058] Optionally, the first ranging element 41 and the second ranging element 42 are lasers. A laser, also known as a laser rangefinder, works by emitting a beam of light that passes through optical elements to become a parallel beam. This beam is then reflected back from the target and received by a built-in receiver, which converts it into an electrical signal. The target distance is calculated based on the time difference between the laser pulse emission and reception.

[0059] In the technical solution of this application embodiment, the electrode 200 after unwinding enters the rolling assembly 20 for cold pressing, and the coating area 202 of the electrode 200 is compacted to a preset thickness. The cold-pressed electrode 200 then passes through the stretching assembly 30, which stretches the blank area 201 of the electrode 200. After stretching the blank area 201 of the electrode 200, the electrode 200 then passes through the stretching measurement assembly 40, which can measure the relative elongation of the coating area 202 and the blank area 201 of the electrode 200 in real time. The extended measurement assembly 40 includes a first ranging element 41 and a second ranging element 42. The first ranging element 41 and the second ranging element 42 are located on the same side of the thickness direction Z of the electrode 200, and the first ranging element 41 and the second ranging element 42 are distributed at intervals along the width direction X of the electrode 200. The first ranging element 41 faces the blank area 201 of the electrode 200, and the second ranging element 42 faces the coating area 202 of the electrode 200. The first ranging element 41 can measure the distance between the first ranging element 41 and the blank area 201 of the electrode 200, and the second ranging element 42 can measure the distance between the second ranging element 42 and the coating area 202 of the electrode 200. The first ranging element 41 and the second ranging element 42 simultaneously and continuously measure the distance information between the blank area 201 and the coating area 202 of the electrode 200 and the corresponding ranging element. After the measured data is calculated and analyzed, the relative elongation rate of the blank area 201 and the coating area 202 of the electrode 200 during that period can be characterized.

[0060] The calculation principle of the relative elongation of the blank area 201 and the coating area 202 of the electrode 200 is as follows: Referring to Figure 4, the distance between the first measuring element 41 and the blank area 201 of the electrode 200, as measured by the first measuring element 41, is ab, and the distance between the second measuring element 42 and the coating area 202 of the electrode 200, as measured by the second measuring element 42, is ac. The relative elongation of the blank area 201 and the coating area 202 of the electrode 200 can be characterized by various calculation methods. Two methods are listed below for explanation.

[0061] The first method involves calculating the relative displacement bc between the coating area 202 and the blank area 201 of the electrode 200 based on the distance ab measured by the first ranging element 41 and the distance ac measured by the second ranging element 42, i.e., bc = ac - ab. Statistical data from the extension measurement component 40 over a certain time period is then taken. If the relative displacement bc is within a first preset range, it indicates that the relative extension of the coating area 202 and the blank area 201 of the electrode 200 meets the requirements. When the relative displacement bc is outside the first preset range, the extension setting tension of the extension mechanism is adjusted accordingly. For example, if the relative displacement bc is greater than the maximum value of the first preset range, the extension data of the extension mechanism shows increased extension, and the extension setting tension of the extension mechanism is reduced. If the relative displacement bc is less than the minimum value of the first preset range, the extension data of the extension mechanism shows decreased extension, and the extension setting tension of the extension mechanism is increased.

[0062] The second method involves calculating the relative ratio α between ab and (ac - film thickness of coating area 202) based on the distance ab measured by the first ranging element 41 and the distance ac measured by the second ranging element 42. Statistical data from the stretching measurement component 40 over a certain period is then taken. When the relative ratio α fluctuates within a second preset range, it indicates that the relative stretching rate of the coating area 202 and the blank area 201 of the electrode 200 meets the requirements. If the relative ratio α is outside the second preset range, the stretching setting tension of the stretching mechanism is adjusted accordingly. For example, if the relative ratio α is greater than the maximum value of the second preset range, the stretching data of the stretching mechanism shows increased stretching, so the stretching setting tension of the stretching mechanism is reduced. If the relative ratio α is less than the minimum value of the second preset range, the stretching data of the stretching mechanism shows decreased stretching, so the stretching setting tension of the stretching mechanism is increased.

[0063] According to some embodiments of this application, please refer to Figures 2 and 3. Figure 2 is a structural schematic diagram of the extension measurement component of some embodiments of this application; Figure 3 is a structural schematic diagram of the extension measurement component of some embodiments of this application from another angle. There are multiple extension measurement components 40, which are spaced apart along the width direction X of the electrode 200.

[0064] The term "multiple" refers to the fact that the number of extension measurement components 40 can be two, three, or four, etc. Optionally, there are two extension measurement components 40 on the same side of the thickness direction Z of the electrode 200. The two extension measurement components 40 are distributed on both sides of the width direction X of the electrode 200.

[0065] Since the electrode 200 may have multiple alternating coating areas 202 and blank areas 201 in its width direction X, by setting the number of stretch measurement components 40 to multiple, and distributing the multiple stretch measurement components 40 at intervals along the width direction X of the electrode 200, the multiple stretch measurement components 40 can simultaneously measure the distance between the blank areas 201 and coating areas 202 at multiple different points in the width direction X of the electrode 200. After calculation and analysis, the data obtained is more comprehensive and accurate in terms of the relative elongation of the coating areas 202 and blank areas 201 of the electrode 200.

[0066] According to some embodiments of this application, there are multiple stretch measurement components 40, which are distributed on both sides of the thickness direction Z of the electrode 200, and the stretch measurement components 40 located on both sides of the thickness direction Z of the electrode 200 are arranged facing each other.

[0067] The term "multiple" refers to the fact that the number of stretch measurement components 40 can be two, three, or four, etc. Multiple stretch measurement components 40 are provided on both sides of the electrode 200 in the thickness direction Z.

[0068] Optionally, the number of extension measurement components 40 is four. The four extension measurement components 40 are arranged in groups of two on both sides of the thickness direction Z of the electrode 200. That is, there are two extension measurement components 40 on each side of the thickness direction Z of the electrode 200, and the two extension measurement components on the same side of the thickness direction Z of the electrode 200 are located on both sides of the width direction X of the electrode 200.

[0069] Taking the example of having an elongation measurement component 40 on both sides of the thickness direction Z of the electrode 200, the calculation principle of the relative elongation of the blank area 201 and the coating area 202 of the electrode 200 is explained. Please refer to Figures 3 and 4. Figure 3 is a structural schematic diagram of the elongation measurement component from another angle in some embodiments of this application; Figure 4 is a schematic diagram of the data measured by the elongation measurement component in some embodiments of this application. The electrode 200 has a thickness direction Z on both sides, namely the front side A and the back side B of the electrode 200. The two ranging elements located on the front side A of the electrode 200 are designated as the first ranging element 41 and the second ranging element 42. The first ranging element 41 faces the blank area 201 of the electrode 200, and the second ranging element 42 faces the coating area 202 of the electrode 200. The two ranging elements located on the back side B of the electrode 200 are designated as the third ranging element 43 and the fourth ranging element 44. The third ranging element 43 faces the blank area 201 of the electrode 200, and the fourth ranging element 44 faces the coating area 202 of the electrode 200.

[0070] The first method is as follows: Based on the distance ab measured by the first ranging element 41 and the distance ac measured by the second ranging element 42, the relative displacement bc between the coating area 202 and the blank area 201 of the electrode 200 is calculated, i.e., bc = ac - ab; based on the distance db measured by the third ranging element 43 and the distance dc measured by the second ranging element 42, the relative displacement cb between the coating area 202 and the blank area 201 of the electrode 200 is calculated, bc = cb. By taking the statistical data of the extension measurement component 40 over a certain period of time, if the relative displacement bc is within a first preset range, it can be shown that the relative extension of the coating area 202 and the blank area 201 of the electrode 200 meets the requirements. When the relative displacement bc is outside the first preset range, the extension setting tension of the extension mechanism is adjusted accordingly. For example, when the relative displacement bc is greater than the maximum value of the first preset range, the extension data of the extension mechanism shows increased extension, and the extension setting tension of the extension mechanism is reduced. When the relative displacement bc is less than the minimum value of the first preset range, the extension data of the extension mechanism shows that the extension becomes smaller, so the extension setting tension of the extension mechanism is increased.

[0071] The second method is as follows: Based on the distance ab measured by the first ranging element 41 and the distance ac measured by the second ranging element 42, calculate the relative ratio α between ab and (ac - film thickness of coating area 202); based on the distance db measured by the third ranging element 43 and the distance dc measured by the second ranging element 42, calculate the relative ratio β between db and (dc - film thickness of coating area 202).

[0072] Statistical data from the stretching measurement component 40 over a certain period is collected. When the relative ratio α fluctuates within a second preset range, it indicates that the relative stretching rate of the coating area 202 and the blank area 201 of the electrode 200 meets the requirements. If the relative ratio α is outside the second preset range, the stretching setting tension of the stretching mechanism is adjusted accordingly. For example, if the relative ratio α is greater than the maximum value of the second preset range, the stretching data of the stretching mechanism shows increased stretching, so the stretching setting tension of the stretching mechanism is reduced. If the relative ratio α is less than the minimum value of the second preset range, the stretching data of the stretching mechanism shows decreased stretching, so the stretching setting tension of the stretching mechanism is increased.

[0073] Alternatively, statistical data from the stretching measurement component 40 over a certain period can be collected. When the relative ratio β fluctuates within a third preset range, it indicates that the relative stretching rate of the coating area 202 and the blank area 201 of the electrode 200 meets the requirements. If the relative ratio β is outside the third preset range, the stretching setting tension of the stretching mechanism is adjusted accordingly. For example, if the relative ratio β is greater than the maximum value of the second preset range, the stretching data of the stretching mechanism shows increased stretching, so the stretching setting tension of the stretching mechanism is reduced. If the relative ratio β is less than the minimum value of the third preset range, the stretching data of the stretching mechanism shows decreased stretching, so the stretching setting tension of the stretching mechanism is increased.

[0074] By setting extension measurement components 40 on both sides of the thickness direction Z of the electrode 200, multiple sets of extension measurement components 40 can work together to obtain the distance information between the coating area 202 and the blank area 201 on both sides of the thickness direction Z of the electrode 200. This allows for a more comprehensive calculation of the relative elongation rate of the blank area 201 and the coating area 202 on both sides of the thickness direction Z of the electrode 200. The data is more comprehensive and easier to visualize through software.

[0075] According to some embodiments of this application, please refer to FIG2, which is a schematic structural diagram of an extension measurement assembly according to some embodiments of this application. The extension measurement assembly 40 further includes a substrate 45, and a first ranging element 41 and a second ranging element 42 are movably disposed on the substrate 45.

[0076] The substrate 45 refers to the plate structure that provides mounting functionality for the first ranging element 41 and the second ranging element 42. The substrate 45 can be made of various materials, and the material of the substrate 45 is not limited. The first ranging element 41 and the second ranging element 42 can move on the substrate 45 in various ways, such as sliding or rolling.

[0077] The first ranging element 41 and the second ranging element 42 are movably disposed on the substrate 45. The positions of the first ranging element 41 and the second ranging element 42 on the substrate 45 can be adjusted according to actual needs, thereby adjusting the relative positions of the first ranging element 41 and the second ranging element 42 with the electrode 200. This enables distance measurement at different positions on the electrode 200, providing greater flexibility and a wider range of applications.

[0078] According to some embodiments of this application, please continue to refer to FIG2. A guide portion 46 is provided on the substrate 45. The guide portion 46 extends along the width direction X of the electrode 200. At least one of the first ranging element 41 and the second ranging element 42 slides in cooperation with the guide portion 46.

[0079] The guide part 46 can have various guiding structures, such as a guide rail, a slide, or a guide rod.

[0080] Optionally, the guide portion 46 is a dovetail-shaped groove, and the first ranging element 41 and / or the second ranging element 42 slides in cooperation with the guide portion 46.

[0081] At least one of the first ranging element 41 and the second ranging element 42 is slidably engaged with the guide portion 46. This means that the first ranging element 41 is slidably disposed on the guide portion 46, and the second ranging element 42 is fixedly disposed on the guide portion 46; or, the first ranging element 41 is fixedly disposed on the guide portion 46, and the second ranging element 42 is slidably disposed on the guide portion 46; alternatively, both the first ranging element 41 and the second ranging element 42 are slidably disposed on the guide portion 46. Optionally, both the first ranging element 41 and the second ranging element 42 are slidably disposed on the guide portion 46.

[0082] Of course, a locking element can be provided on the guide portion 46. The locking element is used to lock the position of the first ranging element 41 or the second ranging element 42 after it has moved into place. The locking element can be a locking screw, which is installed on the base of the first ranging element 41 or the second ranging element 42. The locking screw is threaded into the base. By rotating the locking screw, one end of the locking screw abuts against the groove in the guide portion 46, thereby restricting the movement of the first ranging element 41 or the second ranging element 42.

[0083] With the guide portion 46 extended along the width direction X of the electrode 200, the guide portion 46 can guide and cooperate with the first ranging element 41 and / or the second ranging element 42. By adjusting the relative positions of the first ranging element 41 and the second ranging element 42 with the electrode 200 in the width direction X, distance measurement of different points in the width direction X of the electrode 200 can be achieved, which is highly flexible and has a wider range of applications.

[0084] According to some embodiments of this application, the extension measurement assembly 40 further includes a drive (not shown in the figure) for driving the first ranging element 41 and / or the second ranging element 42 to move on the guide portion 46.

[0085] The driving component can be mounted on the base plate 45. The driving component can be a variety of linear drive mechanisms, such as a cylinder, hydraulic cylinder, electric actuator, or linear module. Optionally, the driving component is an electric actuator, and the driving end of the electric actuator is connected to the first ranging element 41 or the second ranging element 42. There can be two driving components, each corresponding to control the first ranging element 41 or the second ranging element 42.

[0086] By setting the driving component, the driving component can drive the first ranging element 41 and / or the second ranging element 42 to move on the guide portion 46, thereby adjusting the position of the first ranging element 41 and the second ranging element 42 on the substrate 45 without the need for manual adjustment, and the degree of automation is high.

[0087] According to some embodiments of this application, the cold pressing mechanism further includes a controller, and both the extension measuring component 40 and the extension component 30 are electrically connected to the controller. The controller is used to control the tension of the tension roller 31 in the extension component 30 according to the data transmitted by the extension measuring component 40.

[0088] A controller is a command device that controls the starting, speed regulation, braking, and reversing of a motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit according to a predetermined sequence. It consists of a program counter, instruction register, instruction decoder, timing generator, and operation controller. It is the "decision-making body" that issues commands, that is, it coordinates and directs the operation of the entire computer system.

[0089] The controller can be a PLC. A Programmable Logic Controller (PLC) is a digital electronic system specifically designed for industrial applications. It uses a programmable memory to store instructions for performing logical operations, sequential control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production processes through digital or analog inputs and outputs.

[0090] By setting the controller, the controller can calculate, summarize and analyze the data transmitted by the stretching measurement component 40, and dynamically adjust the tension of the tension roller 31 in the stretching component 30 according to the stretching state of the electrode 200, so as to achieve the consistency of the stretching state of the electrode 200, reduce the frequency of abnormal problems caused by the stretching action of the electrode 200, and eliminate the need for manual adjustment of the tension roller 31 in the stretching component 30, thus achieving a higher degree of automation and reducing the workload of the staff.

[0091] According to some embodiments of this application, referring to Figures 2 and 3, the cold pressing mechanism further includes a limiting component 60. Along the conveying direction of the electrode 200, the limiting component 60 is disposed on one side of the extension measuring component 40. The limiting component 60 is used to limit the jitter amplitude of the electrode 200 in its thickness direction Z.

[0092] The limiting component 60 can be various limiting mechanisms. For example, the limiting component 60 can be a baffle, which is disposed on both sides of the electrode 200 in the thickness direction Z, and the baffle serves to block and limit the electrode 200 in the thickness direction Z. Of course, the limiting component 60 can also be a roller 61.

[0093] Since the electrode 200 may vibrate during transport, and this vibration can affect the measurement accuracy of the stretching measurement component 40, the stretching measurement component 40 is equipped with a limiting component 60 to better obtain the distance information between the blank area 201 and the coating area 202 on the electrode 200. The limiting component 60 can limit the electrode 200 as it passes through the stretching measurement component 40, thereby controlling the vibration amplitude of the electrode 200 in the thickness direction Z. This makes the distance information between the coating area 202 and the blank area 201 of the electrode 200 obtained by the stretching measurement component 40 more accurate and precise.

[0094] According to some embodiments of this application, please continue to refer to Figures 2 and 3. The limiting component 60 includes a mounting plate and two rollers 61. The two rollers 61 are rotatably mounted on the mounting plate. The two rollers 61 are respectively disposed on both sides of the thickness direction Z of the electrode 200 for abutting against both sides of the thickness direction Z of the electrode 200.

[0095] The mounting plate provides mounting functionality for the rollers 61, which are rotatably mounted on the mounting plate via bearings. The two rollers 61 are located on both sides of the electrode sheet 200 in the thickness direction Z. The two rollers 61 can be directly opposite each other on both sides of the electrode sheet 200 in the thickness direction Z, or they can be staggered, that is, the two rollers 61 are staggered in the conveying direction of the electrode sheet 200.

[0096] By using rollers 61 as the limiting component 60, which are rotatably mounted on the mounting plate, the two rollers 61 are located on both sides of the thickness direction Z of the electrode 200. Under the conveying action of the electrode 200, the rollers 61 rotate and guide and limit the two sides of the thickness direction Z of the electrode 200. That is, the area between the two rollers 61 limits the displacement of the electrode 200 in its thickness direction Z, thereby effectively suppressing the jitter amplitude of the electrode 200 in its thickness direction Z, thus making the distance information of the coating area 202 and the blank area 201 of the electrode 200 obtained by the extension measurement component 40 more accurate.

[0097] According to some embodiments of this application, the two rollers 61 are staggered in the conveying direction of the electrode 200.

[0098] The misalignment of the two rollers 61 in the conveying direction of the electrode 200 means that the two rollers 61 are not directly opposite each other in the thickness direction Z of the electrode 200, and the two rollers 61 have a gap in the conveying direction of the electrode 200.

[0099] By staggering the two rollers 61 in the same set of limiting components 60 in the conveying direction of the electrode 200, compared with the two rollers 61 being directly opposite each other, the risk of particles falling off the coating area 202 of the electrode 200 is reduced because the squeezing force of the two rollers 61 on the coating area 202 of the electrode 200 is difficult to control due to the direct opposite distribution of the two rollers 61.

[0100] According to some embodiments of this application, please refer to FIG3. The number of limiting components 60 is set to multiple, and the multiple limiting components 60 are distributed at intervals along the width direction X of the electrode 200 and / or along the conveying direction of the electrode 200.

[0101] The number of limiting components 60 is set to multiple, meaning that the number of limiting components 60 can be two, three, or four, etc. The multiple limiting components 60 are spaced apart along the width direction X and / or along the conveying direction of the electrode 200, meaning that the multiple limiting components 60 can be spaced apart along the width direction X of the electrode 200, or spaced apart along the conveying direction of the electrode 200, or spaced apart along both the width direction X and the conveying direction of the electrode 200.

[0102] Optionally, the number of limiting components 60 is set to four. Two limiting components 60 are respectively provided on one side of the thickness direction Z of the electrode 200, and the two limiting components 60 located on the same side of the thickness direction Z of the electrode 200 are respectively located on both sides of the width direction X of the electrode 200.

[0103] By setting the number of limiting components 60 to multiple, multiple limiting components 60 can work together to increase the number of limiting points on the electrode 200, thereby minimizing the probability of the extension measurement component 40 being affected by the vibration of the electrode 200.

[0104] This application also provides a battery production line, which includes the cold pressing mechanism 100 of any of the foregoing embodiments.

[0105] In some embodiments, referring to Figures 1 to 3, the cold pressing mechanism 100 includes a roller pressing assembly 20, an extension assembly 30, and an extension measuring assembly 40 arranged sequentially. The roller pressing assembly 20 is used to cold press the coating area 202 of the electrode 200, the extension assembly 30 is used to extend the blank area 201 of the electrode 200, and the extension measuring assembly 40 is used to detect the elongation rate of the electrode 200 after cold pressing and extension. The extension measuring assembly 40 includes a first measuring element 41 and a second measuring element 42. The first measuring element 41 and the second measuring element 42 are disposed on the same side of the thickness direction Z of the electrode 200, and the first measuring element 41 and the second measuring element 42 are distributed at intervals along the width direction X of the electrode 200. The first measuring element 41 is used to measure the distance between the first measuring element 41 and the blank area 201 of the electrode 200, and the second measuring element 42 is used to measure the distance between the second measuring element 42 and the coating area 202 of the electrode 200. There are four extension measurement components 40. Two extension measurement components 40 are respectively arranged on both sides of the thickness direction Z of the electrode 200, and two extension measurement components 40 located on the same side of the thickness direction Z of the electrode 200 are located on both sides of the width direction X of the electrode 200.

[0106] The extended measurement assembly 40 includes a first ranging element 41 and a second ranging element 42. The first ranging element 41 and the second ranging element 42 are located on the same side of the thickness direction Z of the electrode 200, and the first ranging element 41 and the second ranging element 42 are distributed at intervals along the width direction X of the electrode 200. The first ranging element 41 faces the blank area 201 of the electrode 200, and the second ranging element 42 faces the coating area 202 of the electrode 200. The first ranging element 41 can measure the distance between the first ranging element 41 and the blank area 201 of the electrode 200, and the second ranging element 42 can measure the distance between the second ranging element 42 and the coating area 202 of the electrode 200. The first ranging element 41 and the second ranging element 42 simultaneously and continuously measure the distance information between the blank area 201 and the coating area 202 of the electrode 200 and the corresponding ranging element multiple times. After calculation and analysis of the measured data, the relative elongation rate of the blank area 201 and the coating area 202 of the electrode 200 during that period can be characterized. By setting the number of elongation measurement components 40 to four, the four elongation measurement components 40 can simultaneously measure the distance between the blank area 201 and the coating area 202 at different points in the width direction X and thickness direction Z of the electrode 200. After calculation and analysis of the obtained data, the data on the relative elongation rate of the coating area 202 and the blank area 201 of the electrode 200 is more comprehensive and accurate.

[0107] In some embodiments, the first ranging element 41 and the second ranging element 42 are movably disposed on the substrate 45. A guide portion 46 is disposed on the substrate 45, the guide portion 46 extending along the width direction X of the electrode 200, and at least one of the first ranging element 41 and the second ranging element 42 slides in cooperation with the guide portion 46.

[0108] With the guide portion 46 on the substrate 45, the guide portion 46 extends along the width direction X of the electrode 200. The guide portion 46 can guide and cooperate with the first ranging element 41 and / or the second ranging element 42. By adjusting the relative positions of the first ranging element 41 and the second ranging element 42 with the electrode 200 in the width direction X, the distance measurement of different points in the width direction X of the electrode 200 can be realized, which is highly flexible and has a wider range of applications.

[0109] In some embodiments, the cold pressing mechanism 100 further includes a controller, and both the stretching measurement component 40 and the stretching component 30 are electrically connected to the controller. The controller is used to control the tension of the tension roller 31 in the stretching component 30 according to the data transmitted by the stretching measurement component 40. The cold pressing mechanism also includes a limiting component 60, which includes a mounting plate and two rollers 61. The two rollers 61 are rotatably mounted on the mounting plate and are respectively disposed on both sides of the thickness direction Z of the electrode 200 for abutting against both sides of the thickness direction Z of the electrode 200. The two rollers 61 are staggered in the conveying direction of the electrode 200. The number of limiting components 60 is set to multiple, and the multiple limiting components 60 are distributed at intervals along the width direction X and the conveying direction of the electrode 200.

[0110] The controller can calculate, summarize and analyze the data transmitted by the extension measurement component 40, and dynamically adjust the tension of the tension roller 31 in the extension component 30 according to the extension state of the electrode 200, so as to achieve the consistency of the extension state of the electrode 200, reduce the frequency of abnormal problems caused by the extension action of the electrode 200, and eliminate the need for manual adjustment of the tension roller 31 in the extension component 30, thus achieving a higher degree of automation and reducing the workload of the staff. The limiting component 60 is mounted on the mounting plate as rollers 61, with the two rollers 61 located on both sides of the thickness direction Z of the electrode 200. Under the conveying action of the electrode 200, the rollers 61 rotate and guide and limit the two sides of the electrode 200 in the thickness direction Z. That is, the area between the two rollers 61 limits the displacement of the electrode 200 in the thickness direction Z, thereby effectively suppressing the vibration amplitude of the electrode 200 in the thickness direction Z, thus making the distance information of the coating area 202 and the blank area 201 of the electrode 200 obtained by the extension measurement component 40 more accurate.

[0111] While this application has been described with reference to preferred embodiments, various modifications can be made thereto and elements can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A cold-pressing mechanism, comprising a roll-pressing assembly, an elongation assembly and an elongation-measuring assembly arranged in sequence, the roll-pressing assembly being configured to cold-press a coated area of a pole piece, the elongation assembly being configured to elongate a blank area of the pole piece, and the elongation-measuring assembly being configured to detect the elongation rate of the pole piece after cold-pressing and elongation. wherein The elongation-measuring assembly comprises a first distance-measuring element and a second distance-measuring element, the first distance-measuring element and the second distance-measuring element being arranged on the same side of the thickness direction of the pole piece, and the first distance-measuring element and the second distance-measuring element being spaced apart along the width direction of the pole piece, the first distance-measuring element being configured to measure the distance between the first distance-measuring element and the blank area of the pole piece, and the second distance-measuring element being configured to measure the distance between the second distance-measuring element and the coated area of the pole piece. The cold press mechanism of claim 1, wherein The number of the elongation-measuring assemblies is plural, and the plural elongation-measuring assemblies are spaced apart along the width direction of the pole piece. The cold press mechanism of claim 1, wherein The number of the elongation-measuring assemblies is plural, and the plural elongation-measuring assemblies are arranged on both sides of the thickness direction of the pole piece and face each other. The cold pressing mechanism according to any one of claims 1-3, wherein The elongation-measuring assembly further comprises: A substrate, and the first distance-measuring element and the second distance-measuring element are movably arranged on the substrate. The cold press mechanism of claim 4, wherein The substrate is provided with a guide portion extending along the width direction of the pole piece, and at least one of the first distance-measuring element and the second distance-measuring element is in sliding fit with the guide portion. The cold press mechanism of claim 5, wherein The elongation-measuring assembly further comprises: A driving member configured to drive the first distance-measuring element and / or the second distance-measuring element to move on the guide portion. The cold pressing mechanism according to any one of claims 1-6, wherein The cold-pressing mechanism further comprises a controller, and the elongation-measuring assembly and the elongation assembly are electrically connected to the controller, and the controller is configured to control the tension of the tension roller in the elongation assembly according to the data transmitted by the elongation-measuring assembly. The cold pressing mechanism according to any one of claims 1-7, wherein The cold-pressing mechanism further comprises a limiting assembly arranged on one side of the elongation-measuring assembly along the conveying direction of the pole piece, and the limiting assembly is configured to limit the shaking amplitude of the pole piece in the thickness direction thereof. The cold press mechanism of claim 8, wherein The limiting assembly comprises a mounting plate and two rollers, and the two rollers are respectively rotatably mounted on the mounting plate and arranged on both sides of the thickness direction of the pole piece to abut against both sides of the thickness direction of the pole piece. The cold press mechanism of claim 9, wherein The two rollers are arranged in a staggered manner along the conveying direction of the pole piece. The cold press mechanism of claim 8, wherein The number of the limiting assemblies is plural, and the plural limiting assemblies are spaced apart along the width direction of the pole piece and / or along the conveying direction of the pole piece. A battery production line comprising the cold-pressing mechanism according to any one of claims 1-11.

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