Cold pressing mechanism and battery production line

Abstract

The embodiment of the utility model provides a cold pressing mechanism and a battery production line. The cold pressing mechanism comprises a rolling assembly, an extension assembly and an extension measurement assembly which are sequentially distributed, the rolling assembly is used for cold pressing of a film coating area of the pole piece, the extension assembly is used for extension of a blank area of the pole piece, and the extension measurement assembly is used for extension rate detection of the pole piece after cold pressing and extension; wherein the extension 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 are 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 are distributed at intervals in the width direction of the pole piece; the first distance measuring element is used for measuring the distance between the first distance measuring element and the blank area of the pole piece, and the second distance measuring element is used for measuring the distance between the second distance measuring element and the film coating area of the pole piece. According to the technical scheme provided by the invention, the extension rate of the pole piece can be detected on line.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a cold pressing mechanism and a battery production line. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] During the battery manufacturing process, it is often necessary to perform a rolling operation on the electrode strip. After the rolling operation is completed, it is necessary to detect the elongation rate of the electrode. Currently, for the detection of the elongation rate of the electrode, most of them use an offline manual measurement method, and it is impossible to perform an online detection of the elongation rate of the electrode, resulting in a problem of low detection efficiency of the elongation rate. Summary of the Utility Model

[0004] The present application provides a cold pressing mechanism and a battery production line, which can perform an online detection of the elongation rate of the electrode.

[0005] The present application is implemented by the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a cold pressing mechanism. The cold pressing mechanism includes a rolling assembly, an elongation assembly, and an elongation measurement assembly that are sequentially distributed. The rolling assembly is used to cold press the coating area of the electrode, the elongation assembly is used to elongate the blank area of the electrode, and the elongation measurement assembly is used to detect the elongation rate of the electrode after cold pressing and elongation; wherein, the elongation measurement assembly includes a first distance measuring element and a second distance measuring element. The first distance measuring element and the second distance measuring element are arranged on the same side in the thickness direction of the electrode, and the first distance measuring element and the second distance measuring element are spaced apart along the width direction of the electrode. The first distance measuring element is used to measure the distance between the first distance measuring element and the blank area of the electrode, and the second distance measuring element is used to measure the distance between the second distance measuring element and the coating area of the electrode.

[0007] In the technical solution of the embodiment of the present application, after the unwinding of the electrode sheet, it enters the rolling assembly for cold pressing, and the coating area of the electrode sheet is compacted to a preset thickness. The cold-pressed electrode sheet then passes through the stretching assembly, and the stretching assembly stretches the blank area of the electrode sheet. After stretching the blank area of the electrode sheet, the electrode sheet then passes through the stretching measurement assembly, and the stretching measurement assembly can measure the relative stretching rate of the coating area and the blank area of the electrode sheet in real time. The stretching measurement assembly includes a first distance measuring element and a second distance measuring element. The first distance measuring element and the second distance measuring element are located on the same side in the thickness direction of the electrode sheet, and the first distance measuring element and the second distance measuring element are spaced apart along the width direction of the electrode sheet. The first distance measuring element faces the blank area of the electrode sheet, and the second distance measuring element faces the coating area of the electrode sheet. The first distance measuring element can measure the distance between the first distance measuring element and the blank area of the electrode sheet, and the second distance measuring element can measure the distance between the second distance measuring element and the coating area of the electrode sheet. Let the first distance measuring element and the second distance measuring element respectively and continuously measure the distance information between the blank area and the coating area of the electrode sheet and the corresponding distance measuring elements multiple times at the same time. Then, after calculating and analyzing the measured data, the relative stretching rate of the blank area and the coating area of the electrode sheet during this period can be characterized.

[0008] The calculation principle of the relative stretching rate of the blank area and the coating area of the electrode sheet is as follows: Let the distance between the first distance measuring element and the blank area of the electrode sheet measured by the first distance measuring element be ab, and the distance between the second distance measuring element and the coating area of the electrode sheet measured by the second distance measuring element be ac. There are various calculation methods to characterize the relative stretching rate of the blank area and the coating area of the electrode sheet. The following lists two methods for illustration.

[0009] The first method is: According to the distance ab measured by the first distance measuring element and the distance ac measured by the second distance measuring element, calculate the relative displacement bc of the coating area and the blank area of the electrode sheet, that is, bc = ac - ab. Take the statistical data of a certain period of time of the stretching measurement assembly. When the relative displacement bc is within the first preset interval range, it can be characterized that the relative stretching of the coating area and the blank area of the electrode sheet meets the requirements. When the relative displacement bc is not within the first preset range, the stretching set tension of the stretching mechanism is adjusted accordingly. For example, when the relative displacement bc is greater than the maximum value of the first preset range, it means that the stretching data of the stretching mechanism shows an increase in stretching, so the stretching set tension of the stretching mechanism is reduced. When the relative displacement bc is less than the minimum value of the first preset range, it means that the stretching data of the stretching mechanism shows a decrease in stretching, so the stretching set tension of the stretching mechanism is increased.

[0010] The second method is as follows: Based on the distance ab measured by the first distance measuring element and the distance ac measured by the second distance measuring element, calculate the relative ratio α of ab to (ac - the film thickness of the coated film area); obtain the statistical data of the stretching measurement component within a certain period of time. When the relative ratio α fluctuates within the second preset range, it can indicate that the relative stretching rate of the coated film area and the blank area of the pole piece meets the requirements. If the relative ratio α is not within the second preset range, then adjust the stretching set tension of the stretching mechanism accordingly. For example, when the relative ratio α is greater than the maximum value of the second preset range, it indicates that the stretching data of the stretching mechanism shows an increase in stretching, so the stretching set tension of the stretching mechanism is reduced. When the relative ratio α is less than the minimum value of the second preset range, it indicates that the stretching data of the stretching mechanism shows a decrease in stretching, and then increasing the stretching set tension of the stretching mechanism will do.

[0011] According to some embodiments of the present application, the number of stretching measurement components is multiple, and the multiple stretching measurement components are distributed at intervals along the width direction of the pole piece.

[0012] In the above solution, since the pole piece may have multiple alternately distributed coated film areas and blank areas in its width direction, by setting the number of stretching measurement components to be multiple and the multiple stretching measurement components to be distributed at intervals along the width direction of the pole piece, the multiple stretching measurement components can simultaneously measure the distances of the blank areas and coated film areas at multiple different points in the width direction of the pole piece. After the obtained data is calculated and analyzed, the data of the relative stretching rate of the coated film area and the blank area of the pole piece is more comprehensive and accurate.

[0013] According to some embodiments of the present application, the number of stretching measurement components is multiple, and the multiple stretching measurement components are distributed on both sides of the pole piece in the thickness direction, and the stretching measurement components located on both sides of the pole piece in the thickness direction are distributed opposite to each other.

[0014] In the above solution, by arranging stretching measurement components on both sides of the pole piece in the thickness direction, the multiple groups of stretching measurement components can cooperate together, and can obtain the distance information of the coated film areas and blank areas on both sides of the pole piece in the thickness direction, and can more comprehensively calculate the relative stretching rate of the blank areas and coated film areas on both sides of the pole piece in the thickness direction. The data is more comprehensive, and it is also easier to make the visualization degree of the stretching state data of the pole piece higher through software.

[0015] According to some embodiments of the present application, the stretching measurement component further includes a substrate, and the first distance measuring element and the second distance measuring element are movably arranged on the substrate.

[0016] In the above solution, the first distance measuring element and the second distance measuring element are movably arranged on the substrate, and the positions of the first distance measuring element and the second distance measuring element on the substrate can be adjusted correspondingly according to actual requirements, so as to adjust the relative positions of the first distance measuring element and the second distance measuring element with respect to the pole piece, enabling distance measurement at different positions on the pole piece, with stronger flexibility and a wider application range.

[0017] According to some embodiments of the present application, a guiding portion is provided on the substrate, the guiding portion extends 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 guiding portion.

[0018] In the above solution, through the setting of the guiding portion, the guiding portion extends along the width direction of the pole piece, and the guiding portion can be in guiding cooperation with the first distance measuring element and / or the second distance measuring element. By adjusting the relative positions of the first distance measuring element and the second distance measuring element in the width direction of the pole piece, distance measurement at different points in the width direction of the pole piece can be achieved, with strong flexibility and a wider application range.

[0019] According to some embodiments of the present application, the extension measurement assembly further includes a driving member, and the driving member is used to drive the first distance measuring element and / or the second distance measuring element to move on the guiding portion.

[0020] In the above solution, through the setting of the driving member, the driving member can drive the first distance measuring element and / or the second distance measuring element to move on the guiding portion, thereby adjusting the positions of the first distance measuring element and the second distance measuring element on the substrate, without manual adjustment, and with a high degree of automation.

[0021] According to some embodiments of the present application, the cold pressing mechanism further includes a controller, and both the extension measurement assembly and the extension assembly are electrically connected to the controller. The controller is used to control the tension of the tension swing roller in the extension assembly according to the data transmitted by the extension measurement assembly.

[0022] In the above solution, through the setting of the controller, the controller can calculate, summarize, and analyze the data transmitted by the extension measurement assembly, and dynamically adjust the tension of the tension swing roller in the extension assembly according to the extension state of the pole piece, realizing the consistency of the extension state of the pole piece, reducing the frequency of abnormal problems caused by the extension action of the pole piece, without the need for manual adjustment of the tension of the tension swing roller in the extension assembly, with a higher degree of automation, and also reducing the workload of the staff.

[0023] According to some embodiments of the present application, the cold pressing mechanism further includes a limiting assembly. Along the conveying direction of the pole piece, the limiting assembly is arranged on one side of the extension measurement assembly, and the limiting assembly is used to limit the shaking amplitude of the pole piece in its thickness direction.

[0024] In the above scheme, since the pole piece may shake during the transportation process, and the pole piece shaking will affect the measurement accuracy of the extension measurement component, in order to better obtain the distance information of the blank area and the coating area on the pole piece, the extension measurement component sets a limit component. The limit component can limit the pole piece when the pole piece passes through the extension measurement component to control the shaking amplitude of the pole piece in the thickness direction, so that the distance information of the coating area and the blank area of ​​the pole piece obtained by the extension measurement component is more accurate and has higher precision.

[0025] According to some embodiments of the present application, the limiting assembly includes a mounting plate and two rollers, the two rollers are rotatably mounted on the mounting plate, and the two rollers are respectively arranged on both sides of the thickness direction of the pole piece to be used to abut against both sides of the thickness direction of the pole piece.

[0026] In the above scheme, the limiting component is adopted as a roller, which is installed on the mounting plate by rolling and rotating. The two rollers are respectively located on both sides of the thickness direction of the pole piece. Under the conveying action of the pole piece, the rollers rotate under the conveying action of the pole piece, and play the functions of guiding and limiting the two sides of the thickness direction of the pole piece. That is, the area between the two rollers limits the displacement of the pole piece in its thickness direction, thereby effectively suppressing the jitter amplitude of the pole piece in its thickness direction, so that the distance information of the coating area and the blank area of ​​the pole piece obtained by the extension measurement component can be more accurate.

[0027] According to some embodiments of the present application, the two rollers are staggered in the conveying direction of the pole piece.

[0028] In the above scheme, by staggering the two rollers in the same group of limiting components in the conveying direction of the pole piece, the risk of particles in the coating area of ​​the pole piece falling off due to the poor control of the squeezing force of the two rollers on the coating area of ​​the pole piece due to the facing distribution is reduced compared to the case where the two rollers are directly distributed.

[0029] According to some embodiments of the present application, the number of the limiting components is set to multiple, and the multiple limiting components are distributed at intervals along the width direction of the pole piece and / or along the conveying direction of the pole piece.

[0030] In the above scheme, by setting the number of limit assemblies to multiple, multiple limit assemblies can work together to increase the number of limit points on the pole piece, thereby minimizing the probability of affecting the accuracy of the extension measurement assembly due to pole piece jitter.

[0031] In a second aspect, an embodiment of the present application further provides a battery production line, which includes the cold pressing mechanism of any of the aforementioned embodiments.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0034] Figure 1 Structural schematic diagram of the cold pressing mechanism for some embodiments of the present application;

[0035] Figure 2 Structural schematic diagram of the extension measurement component for some embodiments of the present application;

[0036] Figure 3 Structural schematic diagram of the extension measurement component from another angle for some embodiments of the present application;

[0037] Figure 4 Schematic diagram of the data measured by the extension measurement component for some embodiments of the present application.

[0038] Reference numerals: 100 - cold pressing mechanism; 10 - unwinding assembly; 11 - unwinding roller; 12 - first guide roller; 13 - tape connecting platform; 20 - rolling assembly; 21 - cold rolling roller; 30 - extension assembly; 31 - tension swing roller; 32 - second guide roller; 40 - extension measurement component; 41 - first distance measuring element; 42 - second distance measuring element; 43 - third distance measuring element; 44 - fourth distance measuring element; 45 - substrate; 46 - guiding portion; 50 - winding assembly; 51 - winding roller; 60 - limiting assembly; 61 - roller; 200 - pole piece; 201 - blank area; 202 - coated area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0040] 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 belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0041] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0044] The "plurality" referred to in this application means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0045] Currently, during the battery manufacturing process, it is often necessary to perform a rolling operation on the electrode strip. The rolling operation cold-presses the coating area of the electrode, reducing the thickness of the coating area of the electrode to a preset thickness. After the rolling operation is completed, it is necessary to use an extension component to extend the blank area of the electrode and detect the elongation rate of the extended electrode to measure the consistency of the elongation rates of the coating area and the blank area of the electrode. Currently, for the detection of the elongation rate of the electrode, most of them use an offline manual measurement method, which cannot perform online detection of the elongation rate of the electrode, resulting in a low detection efficiency of the elongation rate.

[0046] Based on the above considerations, in order to better detect the elongation rate of the electrode, this application designs a cold-pressing mechanism. The cold-pressing mechanism includes an extension measurement component. The extension measurement component includes a first distance measurement element and a second distance measurement element. The first distance measurement element and the second distance measurement element are arranged on the same side in the thickness direction of the electrode, and the first distance measurement element and the second distance measurement element are spaced apart along the width direction of the electrode. The first distance measurement element is used to measure the distance between the first distance measurement element and the blank area of the electrode, and the second distance measurement element is used to measure the distance between the second distance measurement element and the coating area of the electrode.

[0047] In such a cold-pressing mechanism, the first distance measurement element can measure the distance between the first distance measurement element and the blank area of the electrode, and the second distance measurement element can measure the distance between the second distance measurement element and the coating area of the electrode. Let the first distance measurement element and the second distance measurement element respectively and continuously measure the distance information between the blank area and the coating area of the electrode and the corresponding distance measurement element multiple times at the same time. Then, after the measured data is calculated and analyzed, it can characterize the relative elongation rates of the blank area and the coating area of the electrode during this period.

[0048] An embodiment of this application provides a cold-pressing mechanism. Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 which is a schematic structural diagram of the cold-pressing mechanism of some embodiments of this application; Figure 2 which is a schematic structural diagram of the extension measurement component of some embodiments of this application; Figure 3Schematic structural diagram of another angle of the stretching measurement component of some embodiments of the present application. The cold pressing mechanism 100 includes a rolling component 20, a stretching component 30, and a stretching measurement component 40 that are sequentially distributed. The rolling component 20 is used to cold press the coated area 202 of the electrode sheet 200. The stretching component 30 is used to stretch the blank area 201 of the electrode sheet 200. The stretching measurement component 40 is used to detect the stretching rate of the electrode sheet 200 after cold pressing and stretching. Among them, the stretching measurement component 40 includes a first distance measuring element 41 and a second distance measuring element 42. The first distance measuring element 41 and the second distance measuring element 42 are arranged on the same side in the thickness direction Z of the electrode sheet 200, and the first distance measuring element 41 and the second distance measuring element 42 are spaced apart along the width direction X of the electrode sheet 200. The first distance measuring element 41 is used to measure the distance between the first distance measuring element 41 and the blank area 201 of the electrode sheet 200, and the second distance measuring element 42 is used to measure the distance between the second distance measuring element 42 and the coated area 202 of the electrode sheet 200.

[0049] The coated area 202 of the electrode sheet 200 refers to the area on the surface of the electrode sheet 200 where the active material layer is coated. The blank area 201 of the electrode sheet 200 refers to the blank area on the surface of the electrode sheet 200 where the active material layer is not coated.

[0050] The rolling component 20 refers to the cold pressing mechanism that cold presses the coated area 202 of the electrode sheet 200. The stretching component 30 refers to the stretching mechanism that provides the stretching function for the blank area 201 of the electrode sheet 200.

[0051] The cold pressing mechanism 100 further includes an unwinding component 10 and a winding component 50. The unwinding component 10 includes an unwinding roller 11 and a plurality of first guide rollers 12. The electrode sheet 200 is wound around the unwinding roller 11. The electrode sheet 200 is gradually released from the unwinding roller 11 and then enters the rolling component 20 under the guidance of the plurality of first guide rollers 12. The rolling component 20 includes two relatively distributed cold rolling rollers 21. Under the pressure of the cold rolling rollers 21, the coated area 202 of the electrode sheet 200 is compacted to a preset thickness. Then, the electrode sheet 200 enters the stretching component 30 through a plurality of second guide rollers 32. After the stretching component 30 stretches the blank area 201 of the electrode sheet 200, the electrode sheet 200 enters the stretching measurement component 40 for stretching rate measurement. After the stretching rate measurement, the electrode sheet 200 enters the winding roller 51 of the winding component 50 to complete the winding of the electrode sheet 200. A tape connecting platform 13 is also arranged between the first guide roller 12 and the rolling component 20.

[0052] The thickness direction Z of the electrode sheet 200 refers to the thickness extension direction of the electrode sheet 200. The width direction X of the electrode sheet 200 refers to the direction perpendicular to the conveying direction of the electrode sheet 200 and parallel to the plane direction of the electrode sheet 200, and is also perpendicular to the length direction of the electrode sheet 200.

[0053] The first distance measuring element 41 and the second distance measuring element 42 can be various distance measuring elements. For example, the first distance measuring element 41 and the second distance measuring element 42 can be distance sensors, lasers, etc.

[0054] Optionally, the first distance measuring element 41 and the second distance measuring element 42 are lasers. A laser, that is, a laser rangefinder, uses a laser to emit a beam of light that becomes a parallel beam of light through an optical element, and then is reflected back after being irradiated on the target. It is received by a receiver built into the laser and converted into an electrical signal. The distance to the target is calculated based on the time difference between the emission of the laser pulse and the reception by the receiver.

[0055] In the technical solution of the embodiment of the present application, after the unwound pole piece 200 enters the rolling assembly 20 for cold pressing, the coating area 202 of the pole piece 200 is compacted to a preset thickness. After being cold pressed, the pole piece 200 then passes through the stretching assembly 30. The stretching assembly 30 stretches the blank area 201 of the pole piece 200. After stretching the blank area 201 of the pole piece 200, the pole piece 200 then passes through the stretching measurement assembly 40. The stretching measurement assembly 40 can measure the relative stretching rate of the coating area 202 and the blank area 201 of the pole piece 200 in real time. The stretching measurement assembly 40 includes a first distance measuring element 41 and a second distance measuring element 42. The first distance measuring element 41 and the second distance measuring element 42 are located on the same side of the pole piece 200 in the thickness direction Z, and the first distance measuring element 41 and the second distance measuring element 42 are spaced apart along the width direction X of the pole piece 200. The first distance measuring element 41 faces the blank area 201 of the pole piece 200, and the second distance measuring element 42 faces the coating area 202 of the pole piece 200. The first distance measuring element 41 can measure the distance between the first distance measuring element 41 and the blank area 201 of the pole piece 200, and the second distance measuring element 42 can measure the distance between the second distance measuring element 42 and the coating area 202 of the pole piece 200. Let the first distance measuring element 41 and the second distance measuring element 42 respectively and continuously measure the distance information between the blank area 201 and the coating area 202 of the pole piece 200 and the corresponding distance measuring elements multiple times at the same time. Then, after calculating and analyzing the measured data, the relative stretching rate of the blank area 201 and the coating area 202 of the pole piece 200 during this period can be characterized.

[0056] The calculation principle of the relative stretching rate of the blank area 201 and the coating area 202 of the pole piece 200 is as follows: Please refer to Figure 4 Taking the distance between the first distance measuring element 41 and the blank area 201 of the pole piece 200 measured by the first distance measuring element 41 as ab, and the distance between the second distance measuring element 42 and the coating area 202 of the pole piece 200 measured by the second distance measuring element 42 as ac, there are various calculation methods to characterize the relative stretching rate of the blank area 201 and the coating area 202 of the pole piece 200. The following lists two methods for illustration.

[0057] The first method is as follows: Based on the distance ab measured by the first distance measuring element 41 and the distance ac measured by the second distance measuring element 42, calculate the relative displacement bc between the coated area 202 and the blank area 201 of the electrode plate 200, that is, bc = ac - ab. Take the statistical data of the extension measurement assembly 40 within a certain period of time. When the relative displacement bc is within the first preset range, it can indicate that the relative extension of the coated area 202 and the blank area 201 of the electrode plate 200 meets the requirements. When the relative displacement bc is not within 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, it means that the extension data of the extension mechanism shows an increase in extension, so 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, it means that the extension data of the extension mechanism shows a decrease in extension, so the extension setting tension of the extension mechanism is increased.

[0058] The second method is as follows: Based on the distance ab measured by the first distance measuring element 41 and the distance ac measured by the second distance measuring element 42, calculate the relative ratio α of ab to (ac - the film thickness of the coated area 202); Take the statistical data of the extension measurement assembly 40 within a certain period of time. When the relative ratio α fluctuates within the second preset range, it can indicate that the relative extension rate of the coated area 202 and the blank area 201 of the electrode plate 200 meets the requirements. If the relative ratio α is not within the second preset range, the extension setting tension of the extension mechanism is adjusted accordingly. For example, when the relative ratio α is greater than the maximum value of the second preset range, it means that the extension data of the extension mechanism shows an increase in extension, so the extension setting tension of the extension mechanism is reduced. When the relative ratio α is less than the minimum value of the second preset range, it means that the extension data of the extension mechanism shows a decrease in extension, so the extension setting tension of the extension mechanism can be increased.

[0059] According to some embodiments of the present application, please refer to Figure 2 and Figure 3 , Figure 2 is a schematic structural diagram of the extension measurement assembly of some embodiments of the present application; Figure 3 is a schematic structural diagram of the extension measurement assembly of some embodiments of the present application from another angle. The number of the extension measurement assemblies 40 is multiple, and the multiple extension measurement assemblies 40 are distributed at intervals along the width direction X of the electrode plate 200.

[0060] The number of the extension measurement assemblies 40 being multiple means that the number of the extension measurement assemblies 40 can be two, three, four, etc. Optionally, the number of the extension measurement assemblies 40 on the same side in the thickness direction Z of the electrode plate 200 is two. The two extension measurement assemblies 40 are distributed on both sides of the electrode plate 200 in the width direction X.

[0061] Since the electrode sheet 200 may have a plurality of alternately distributed coating regions 202 and blank regions 201 in its width direction X, by setting the number of the extension measurement components 40 to be plural, the plurality of extension measurement components 40 are spaced apart along the width direction X of the electrode sheet 200. In this way, the plurality of extension measurement components 40 can simultaneously measure the distances to the blank regions 201 and the coating regions 202 at a plurality of different positions in the width direction X of the electrode sheet 200. After the obtained data is calculated and analyzed, the data of the relative extension ratios of the coating regions 202 and the blank regions 201 of the electrode sheet 200 are more comprehensive and accurate.

[0062] According to some embodiments of the present application, the number of the extension measurement components 40 is plural, and the plurality of extension measurement components 40 are distributed on both sides of the electrode sheet 200 in the thickness direction Z, and the extension measurement components 40 located on both sides of the electrode sheet 200 in the thickness direction Z are disposed opposite to each other.

[0063] The number of the extension measurement components 40 being plural means that the number of the extension measurement components 40 can be two, three, four, etc. A plurality of extension measurement components 40 are provided on both sides of the electrode sheet 200 in the thickness direction Z.

[0064] Optionally, the number of the extension measurement components 40 is four. The four extension measurement components 40 are respectively located on both sides of the electrode sheet 200 in the thickness direction Z with two extension measurement components 40 in each group. That is to say, there are two extension measurement components 40 on both sides of the electrode sheet 200 in the thickness direction Z, and the two extension measurement components located on the same side of the electrode sheet 200 in the thickness direction Z are located on both sides of the electrode sheet 200 in the width direction X.

[0065] Taking the example that the extension measurement components 40 are provided on both sides of the electrode sheet 200 in the thickness direction Z, the calculation principle of the relative extension ratios of the blank regions 201 and the coating regions 202 of the electrode sheet 200 is described. Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic structural diagram of the extension measurement component from another angle of some embodiments of the present application;

[0066] Figure 4 which is a schematic diagram of the data measured by the extension measurement component of some embodiments of the present application. The two sides of the electrode sheet 200 in the thickness direction Z are respectively the front side A and the back side B of the electrode sheet 200. Taking the two ranging elements located on the front side A of the electrode sheet 200 as the first ranging element 41 and the second ranging element 42, the first ranging element 41 faces the blank region 201 of the electrode sheet 200, and the second ranging element 42 faces the coating region 202 of the electrode sheet 200; taking the two ranging elements located on the back side B of the electrode sheet 200 as the third ranging element 43 and the fourth ranging element 44, the third ranging element 43 faces the blank region 201 of the electrode sheet 200, and the fourth ranging element 44 faces the coating region 202 of the electrode sheet 200.

[0067] The first method is as follows: According to the distance ab measured by the first distance measuring element 41 and the distance ac measured by the second distance measuring element 42, calculate the relative displacement bc between the coated area 202 and the blank area 201 of the pole piece 200, that is, bc = ac - ab; According to the distance db measured by the third distance measuring element 43 and the distance dc measured by the second distance measuring element 42, calculate the relative displacement cb between the coated area 202 and the blank area 201 of the pole piece 200, bc = cb. Take the statistical data of the extension measurement assembly 40 within a certain period of time. When the relative displacement bc is within the first preset range, it can characterize that the relative extension of the coated area 202 and the blank area 201 of the pole piece 200 meets the requirements. When the relative displacement bc is not within 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, it means that the extension data of the extension mechanism shows an increase in extension, so 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, it means that the extension data of the extension mechanism shows a decrease in extension, so the extension setting tension of the extension mechanism is increased.

[0068] The second method is as follows: According to the distance ab measured by the first distance measuring element 41 and the distance ac measured by the second distance measuring element 42, calculate the relative ratio α of ab to (ac - the film thickness of the coated area 202); According to the distance db measured by the third distance measuring element 43 and the distance dc measured by the second distance measuring element 42, calculate the relative ratio β of db to (dc - the film thickness of the coated area 202).

[0069] Take the statistical data of the extension measurement assembly 40 within a certain period of time. When the relative ratio α fluctuates within the second preset range, it can characterize that the relative extension rate of the coated area 202 and the blank area 201 of the pole piece 200 meets the requirements. If the relative ratio α is not within the second preset range, the extension setting tension of the extension mechanism is adjusted accordingly. For example, when the relative ratio α is greater than the maximum value of the second preset range, it means that the extension data of the extension mechanism shows an increase in extension, so the extension setting tension of the extension mechanism is reduced. When the relative ratio α is less than the minimum value of the second preset range, it means that the extension data of the extension mechanism shows a decrease in extension, so increasing the extension setting tension of the extension mechanism will do.

[0070] Alternatively, take the statistical data of the extension measurement component 40 within a certain period of time. When the relative ratio β fluctuates within the third preset range, it can indicate that the relative extension rates of the coated film area 202 and the blank area 201 of the pole piece 200 meet the requirements. If the relative ratio β is not within the third preset range, the extension set tension of the extension mechanism is adjusted accordingly. For example, when the relative ratio β is greater than the maximum value of the second preset range, it indicates that the extension data of the extension mechanism shows an increase in extension, so the extension set tension of the extension mechanism is reduced. When the relative ratio β is less than the minimum value of the third preset range, it indicates that the extension data of the extension mechanism shows a decrease in extension, and then increasing the extension set tension of the extension mechanism is sufficient.

[0071] By arranging extension measurement components 40 on both sides of the pole piece 200 in the thickness direction Z, such multiple groups of extension measurement components 40 can cooperate together to obtain the distance information of the coated film area 202 and the blank area 201 on both sides of the pole piece 200 in the thickness direction Z, and can more comprehensively calculate the relative extension rates of the blank area 201 and the coated film area 202 on both sides of the pole piece 200 in the thickness direction Z. The data is more comprehensive, and it is also easier to make the visualization degree of the extension state data of the pole piece 200 higher through software.

[0072] According to some embodiments of the present application, please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the extension measurement component of some embodiments of the present application. The extension measurement component 40 further includes a substrate 45, and the first distance measurement element 41 and the second distance measurement element 42 are movably arranged on the substrate 45.

[0073] The substrate 45 refers to a plate structure that provides an installation function for the first distance measurement element 41 and the second distance measurement element 42. The material of the substrate 45 can be various, and the material of the substrate 45 is not limited. The moving methods of the first distance measurement element 41 and the second distance measurement element 42 on the substrate 45 can be various, such as sliding, rolling, etc.

[0074] By movably arranging the first distance measurement element 41 and the second distance measurement element 42 on the substrate 45, the positions of the first distance measurement element 41 and the second distance measurement element 42 on the substrate 45 can be adjusted correspondingly according to actual needs, so as to adjust the relative positions of the first distance measurement element 41 and the second distance measurement element 42 with respect to the pole piece 200, and the distance measurement of different positions on the pole piece 200 can be realized, with stronger flexibility and a wider application range.

[0075] According to some embodiments of the present application, please continue to refer to Figure 2 , on the substrate 45, a guiding portion 46 is provided, the guiding portion 46 extends along the width direction X of the pole piece 200, and at least one of the first distance measurement element 41 and the second distance measurement element 42 is in sliding cooperation with the guiding portion 46.

[0076] The guiding portion 46 can have various guiding structures. For example, the guiding portion 46 can be a guiding element such as a guide rail, a sliding groove, or a guiding rod.

[0077] Optionally, the guiding portion 46 is a dovetail-shaped sliding groove, and the first distance measuring element 41 and / or the second distance measuring element 42 are slidably engaged with the guiding portion 46.

[0078] At least one of the first distance measuring element 41 and the second distance measuring element 42 being slidably engaged with the guiding portion 46 means that the first distance measuring element 41 is slidably disposed on the guiding portion 46, and the second distance measuring element 42 is fixedly disposed on the guiding portion 46, or the first distance measuring element 41 is fixedly disposed on the guiding portion 46, and the second distance measuring element 42 is slidably disposed on the guiding portion 46; it can also be that both the first distance measuring element 41 and the second distance measuring element 42 are slidably disposed on the guiding portion 46. Optionally, both the first distance measuring element 41 and the second distance measuring element 42 are slidably disposed on the guiding portion 46.

[0079] Certainly, a locking member can be provided on the guiding portion 46. The locking member is used to lock the position of the first distance measuring element 41 or the second distance measuring element 42 after the first distance measuring element 41 or the second distance measuring element 42 moves into place. The locking member can be a locking screw, and the locking screw is installed on the base of the first distance measuring element 41 or the second distance measuring element 42. The locking screw is in threaded cooperation with the base. By rotating the locking screw, one end of the locking screw abuts against the groove of the guiding portion 46, thereby restricting the movement of the first distance measuring element 41 or the second distance measuring element 42.

[0080] Through the arrangement of the guiding portion 46, the guiding portion 46 extends along the width direction X of the pole piece 200. The guiding portion 46 can be in guiding cooperation with the first distance measuring element 41 and / or the second distance measuring element 42. By adjusting the relative positions of the first distance measuring element 41 and the second distance measuring element 42 in the width direction X of the pole piece 200, the distance measurement of different points in the width direction X of the pole piece 200 can be realized, with strong flexibility and a wider application range.

[0081] According to some embodiments of the present application, the extension measurement assembly 40 further includes a driving member (not shown in the figure), and the driving member is used to drive the first distance measuring element 41 and / or the second distance measuring element 42 to move on the guiding portion 46.

[0082] The driving member can be installed on the substrate 45. The driving member can be various linear driving mechanisms. For example, the driving member can be a cylinder, a hydraulic cylinder, an electric push rod, or a linear module, etc. Optionally, the driving member is an electric push rod. The driving end of the electric push rod is connected to the first distance measuring element 41 or the second distance measuring element 42. The number of driving members can be two, and the two respectively control the first distance measuring element 41 or the second distance measuring element 42.

[0083] With the arrangement of the driving member, the driving member can drive the first distance measuring element 41 and / or the second distance measuring element 42 to move on the guiding portion 46, so as to adjust the positions of the first distance measuring element 41 and the second distance measuring element 42 on the substrate 45, without manual adjustment, and the degree of automation is high.

[0084] According to some embodiments of the present application, the cold pressing mechanism further includes a controller. Both the stretching measurement assembly 40 and the stretching assembly 30 are electrically connected to the controller, and the controller is used to control the tension of the tension swing roller 31 in the stretching assembly 30 according to the data transmitted by the stretching measurement assembly 40.

[0085] Controller. A controller is a master device that changes the wiring of the main circuit or control circuit and changes the resistance value in the circuit in a predetermined order to control the starting, speed regulation, braking, and reverse of the motor. It consists of a program counter, an instruction register, an instruction decoder, a timing generator, and an operation controller. It is the "decision-making body" that issues commands, that is, it completes the coordination and command of the entire computer system operation.

[0086] The controller can be a PLC. A programmable logic controller (PLC) is a digital operation electronic system specially designed for application in an industrial environment. It uses a programmable memory to store instructions for performing operations such as logical operations, sequential control, timing, counting, and arithmetic operations inside it, and controls various types of mechanical equipment or production processes through digital or analog inputs and outputs.

[0087] With the arrangement of the controller, the controller can calculate, summarize, and analyze the data transmitted by the stretching measurement assembly 40, and dynamically adjust the tension of the tension swing roller 31 in the stretching assembly 30 according to the stretching state of the pole piece 200, realizing the consistency of the stretching state of the pole piece 200, reducing the frequency of abnormal problems caused by the stretching action of the pole piece 200, eliminating the need for manual adjustment of the tension of the tension swing roller 31 in the stretching assembly 30, with a higher degree of automation, and also reducing the workload of the staff.

[0088] According to some embodiments of the present application, please refer to Figure 2 and Figure 3 , the cold pressing mechanism further includes a limiting assembly 60. Along the conveying direction of the pole piece 200, the limiting assembly 60 is arranged on one side of the stretching measurement assembly 40, and the limiting assembly 60 is used to limit the shaking amplitude of the pole piece 200 in its thickness direction Z.

[0089] The limiting assembly 60 can be various limiting mechanisms. For example, the limiting assembly 60 can be a baffle. The baffle is arranged on both sides of the pole piece 200 in the thickness direction Z, and the baffle functions to block and limit both sides of the pole piece 200 in the thickness direction Z. Of course, the limiting assembly 60 can also be a roller 61.

[0090] Since the pole piece 200 may vibrate during transportation, and the vibration of the pole piece 200 will affect the measurement accuracy of the extension measurement component 40. In order to better obtain the distance information between the blank area 201 and the coated film area 202 on the pole piece 200, by setting the limiting component 60, the limiting component 60 can limit the pole piece 200 when the pole piece 200 passes through the extension measurement component 40, so as to control the vibration amplitude of the pole piece 200 in the thickness direction Z, so that the distance information between the coated film area 202 and the blank area 201 of the pole piece 200 obtained by the extension measurement component 40 is more accurate and has higher precision.

[0091] According to some embodiments of the present application, please continue to refer to Figure 2 and Figure 3 , the limiting component 60 includes a mounting plate and two rollers 61. The two rollers 61 are respectively rotatably mounted on the mounting plate, and the two rollers 61 are respectively arranged on both sides of the pole piece 200 in the thickness direction Z for abutting against both sides of the pole piece 200 in the thickness direction Z.

[0092] The mounting plate provides the mounting function for the rollers 61, and the rollers 61 are rotatably mounted on the mounting plate through bearings. The two rollers 61 are located on both sides of the pole piece 200 in the thickness direction Z. The two rollers 61 can be distributed opposite to each other on both sides of the pole piece 200 in the thickness direction Z, or can be distributed in a staggered manner, that is, the two rollers 61 are distributed in a staggered manner in the conveying direction of the pole piece 200.

[0093] By adopting the limiting component 60 in the form of the rollers 61, which are rotatably mounted on the mounting plate, and the two rollers 61 are respectively located on both sides of the pole piece 200 in the thickness direction Z. Under the conveying action of the pole piece 200, the rollers 61 rotate selflessly under the conveying action of the pole piece 200, and play a guiding and limiting function on both sides of the pole piece 200 in the thickness direction Z, that is, the area between the two rollers 61 defines the displacement amount of the pole piece 200 in its thickness direction Z, so as to effectively suppress the vibration amplitude of the pole piece 200 in its thickness direction Z, so that the distance information between the coated film area 202 and the blank area 201 of the pole piece 200 obtained by the extension measurement component 40 has higher precision.

[0094] According to some embodiments of the present application, the two rollers 61 are distributed in a staggered manner in the conveying direction of the pole piece 200.

[0095] The two rollers 61 are distributed in a staggered manner in the conveying direction of the pole piece 200 means that the two rollers 61 are not arranged opposite to each other in the thickness direction Z of the pole piece 200, and the two rollers 61 have a spacing in the conveying direction of the pole piece 200.

[0096] By staggering the two rollers 61 in the same group of limiting components 60 in the conveying direction of the pole piece 200, the risk of particles falling off the coating area 202 of the pole piece 200 due to the poor control of the squeezing force of the two rollers 61 on the coating area 202 of the pole piece 200 is reduced compared to when the two rollers 61 are directly opposite to each other.

[0097] According to some embodiments of this application, please refer to Figure 3 The number of the limiting components 60 is set to be multiple, and the multiple limiting components 60 are distributed at intervals along the width direction X of the pole piece 200 and / or along the conveying direction of the pole piece 200.

[0098] The number of the limiting components 60 is set to be multiple, which means that the number of the limiting components 60 can be two, three or four, etc. The multiple limiting components 60 are spaced along the width direction X of the pole piece 200 and / or along the conveying direction of the pole piece 200, which means that the multiple limiting components 60 can be spaced along the width direction X of the pole piece 200, can be spaced along the conveying direction of the pole piece 200, or can be spaced along the width direction X of the pole piece 200 and spaced along the conveying direction of the pole piece 200.

[0099] Optionally, the number of the limiting components 60 is set to four, two limiting components 60 are respectively provided on one side of the thickness direction Z of the pole piece 200, and the two limiting components 60 located on the same side of the thickness direction Z of the pole piece 200 are respectively located on both sides of the width direction X of the pole piece 200.

[0100] By setting the number of limit assemblies 60 to be multiple, multiple limit assemblies 60 can work together to increase the number of limit points on the pole piece 200, thereby minimizing the probability of the accuracy of the extension measurement assembly 40 being affected by the shaking of the pole piece 200.

[0101] An embodiment of the present application further provides a battery production line, which includes the cold pressing mechanism 100 of any of the aforementioned embodiments.

[0102] In some embodiments, please refer to Figures 1 to 3, the cold pressing mechanism 100 includes a roll pressing assembly 20, a stretching assembly 30, and a stretching measurement assembly 40 that are sequentially distributed. The roll pressing assembly 20 is used to cold press the coated area 202 of the electrode sheet 200, the stretching assembly 30 is used to stretch the blank area 201 of the electrode sheet 200, and the stretching measurement assembly 40 is used to detect the stretching rate of the electrode sheet 200 after cold pressing and stretching. Among them, the stretching measurement assembly 40 includes a first distance measuring element 41 and a second distance measuring element 42. The first distance measuring element 41 and the second distance measuring element 42 are arranged on the same side of the electrode sheet 200 in the thickness direction Z, and the first distance measuring element 41 and the second distance measuring element 42 are spaced apart along the width direction X of the electrode sheet 200. The first distance measuring element 41 is used to measure the distance between the first distance measuring element 41 and the blank area 201 of the electrode sheet 200, and the second distance measuring element 42 is used to measure the distance between the second distance measuring element 42 and the coated area 202 of the electrode sheet 200. The number of the stretching measurement assemblies 40 is four. Two stretching measurement assemblies 40 are respectively arranged on both sides of the electrode sheet 200 in the thickness direction Z, and the two stretching measurement assemblies 40 located on the same side of the electrode sheet 200 in the thickness direction Z are located on both sides of the electrode sheet 200 in the width direction X.

[0103] The stretching measurement assembly 40 includes a first distance measuring element 41 and a second distance measuring element 42. The first distance measuring element 41 and the second distance measuring element 42 are located on the same side of the electrode sheet 200 in the thickness direction Z, and the first distance measuring element 41 and the second distance measuring element 42 are spaced apart along the width direction X of the electrode sheet 200. The first distance measuring element 41 faces the blank area 201 of the electrode sheet 200, and the second distance measuring element 42 faces the coated area 202 of the electrode sheet 200. The first distance measuring element 41 can measure the distance between the first distance measuring element 41 and the blank area 201 of the electrode sheet 200, and the second distance measuring element 42 can measure the distance between the second distance measuring element 42 and the coated area 202 of the electrode sheet 200. Let the first distance measuring element 41 and the second distance measuring element 42 respectively and continuously measure the distance information between the blank area 201 and the coated area 202 of the electrode sheet 200 and the corresponding distance measuring elements at the same time for multiple times. Then, after the measured data is calculated and analyzed, the relative stretching rate of the blank area 201 and the coated area 202 of the electrode sheet 200 during this period can be characterized. The number of the stretching measurement assemblies 40 is set to four. In this way, the four stretching measurement assemblies 40 can simultaneously measure the distances of the blank area 201 and the coated area 202 at different points on the width direction X and the thickness direction Z of the electrode sheet 200. After the obtained data is calculated and analyzed, the data of the relative stretching rate of the coated area 202 and the blank area 201 of the electrode sheet 200 is more comprehensive and accurate.

[0104] In some embodiments, the first distance measuring element 41 and the second distance measuring element 42 are movably arranged on the substrate 45. A guiding portion 46 is arranged on the substrate 45, and the guiding portion 46 extends along the width direction X of the pole piece 200. At least one of the first distance measuring element 41 and the second distance measuring element 42 is in sliding fit with the guiding portion 46.

[0105] Through the arrangement of the guiding portion 46 on the substrate 45, the guiding portion 46 extends along the width direction X of the pole piece 200. The guiding portion 46 can be in guiding fit with the first distance measuring element 41 and / or the second distance measuring element 42. By adjusting the relative positions of the first distance measuring element 41 and the second distance measuring element 42 in the width direction X of the pole piece 200, the distance measurement of different points in the width direction X of the pole piece 200 can be realized, with strong flexibility and a wider application range.

[0106] In some embodiments, the cold pressing mechanism 100 further includes a controller. Both the extension measurement assembly 40 and the extension assembly 30 are electrically connected to the controller. The controller is used to control the tension of the tension pendulum roller 31 in the extension assembly 30 according to the data transmitted by the extension measurement assembly 40. The cold pressing mechanism further includes a limiting assembly 60. The limiting assembly 60 includes a mounting plate and two rollers 61. The two rollers 61 are respectively rotatably mounted on the mounting plate, and the two rollers 61 are respectively arranged on both sides of the pole piece 200 in the thickness direction Z for abutting against both sides of the pole piece 200 in the thickness direction Z. The two rollers 61 are staggeredly distributed in the conveying direction of the pole piece 200. The number of the limiting assemblies 60 is set to be multiple, and the multiple limiting assemblies 60 are spaced apart in the width direction X of the pole piece 200 and the conveying direction of the pole piece 200.

[0107] The controller can calculate, summarize and analyze the data transmitted by the extension measurement assembly 40, and dynamically adjust the tension of the tension pendulum roller 31 in the extension assembly 30 according to the extension state of the pole piece 200, so as to achieve the consistency of the extension state of the pole piece 200, reduce the frequency of abnormal problems caused by the extension action of the pole piece 200, eliminate the need for manual adjustment of the tension of the tension pendulum roller 31 in the extension assembly 30, with higher automation and reduced workload of the staff. The limiting assembly 60 is in the form of rollers 61, which are rotatably mounted on the mounting plate. The two rollers 61 are respectively located on both sides of the pole piece 200 in the thickness direction Z. Under the conveying action of the pole piece 200, the rollers 61 rotate on their own under the conveying action of the pole piece 200, playing a guiding and limiting function on both sides of the pole piece 200 in the thickness direction Z, that is, the area between the two rollers 61 defines the displacement amount of the pole piece 200 in its thickness direction Z, thereby effectively suppressing the shaking amplitude of the pole piece 200 in its thickness direction Z, and thus making the accuracy of the distance information of the coating area 202 and the blank area 201 of the pole piece 200 obtained by the extension measurement assembly 40 higher.

[0108] Although the present application has been described with reference to preferred embodiments, various modifications can be made thereto and elements thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cold pressing mechanism, characterized in that: It includes a rolling assembly, an extension assembly and an extension measurement assembly which are sequentially distributed, wherein the rolling assembly is used to cold-press the coating area of ​​the pole piece, the extension assembly is used to extend the blank area of ​​the pole piece, and the extension measurement assembly is used to detect the extension rate of the pole piece after cold pressing and extension; Wherein, the extension measurement component includes a first ranging element and a second ranging element, the first ranging element and the second ranging element are arranged on the same side of the thickness direction of the pole piece, and the first ranging element and the second ranging element are spaced apart along the width direction of the pole piece, the first ranging element is used to measure the distance between the first ranging element and the blank area of ​​the pole piece, and the second ranging element is used to measure the distance between the second ranging element and the coating area of ​​the pole piece.

2. The cold pressing mechanism according to claim 1, characterized in that: There are multiple extension measurement components, and the multiple extension measurement components are distributed at intervals along the width direction of the pole piece.

3. The cold pressing mechanism according to claim 1, characterized in that: There are multiple extension measurement components, and the multiple extension measurement components are distributed on both sides of the thickness direction of the pole piece. The extension measurement components located on both sides of the thickness direction of the pole piece are distributed opposite to each other.

4. The cold pressing mechanism according to claim 1, characterized in that: The extension measurement assembly also includes: A substrate, wherein the first distance measuring element and the second distance measuring element are movably disposed on the substrate.

5. The cold pressing mechanism according to claim 4, characterized in that: A guide portion is provided on the substrate, and the guide portion is extended 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 slidably matched with the guide portion.

6. The cold pressing mechanism according to claim 5, characterized in that: The extension measurement assembly also includes: A driving member, wherein the driving member is used to drive the first distance measuring element and / or the second distance measuring element to move on the guide portion.

7. The cold pressing mechanism according to claim 1, characterized in that: The cold pressing mechanism also includes a controller, and the extension measurement component and the extension component are both electrically connected to the controller. The controller is used to control the tension of the tension swing roller in the extension component according to the data transmitted by the extension measurement component.

8. The cold pressing mechanism according to claim 1, characterized in that: The cold pressing mechanism further comprises a limit assembly, which is arranged on one side of the extension measurement assembly along the conveying direction of the pole piece, and is used to limit the vibration amplitude of the pole piece in its thickness direction.

9. The cold pressing mechanism according to claim 8, characterized in that: The limiting assembly includes a mounting plate and two rollers. The two rollers are rotatably mounted on the mounting plate respectively. The two rollers are respectively arranged on both sides of the thickness direction of the pole piece so as to be abutted against both sides of the thickness direction of the pole piece.

10. The cold pressing mechanism according to claim 9, characterized in that: The two rollers are staggered in the conveying direction of the pole piece.

11. The cold pressing mechanism according to claim 8, characterized in that: The number of the limiting components is set to be multiple, and the multiple limiting components are distributed at intervals along the width direction of the pole piece and / or along the conveying direction of the pole piece.

12. A battery production line, characterized in that: It comprises a cold pressing mechanism according to any one of claims 1-11.

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