Pole piece slitting system and battery production equipment

Abstract

The utility model provides a pole piece slitting system and battery production equipment, and belongs to the technical field of batteries. The pole piece slitting system comprises a first cutting mechanism used for cutting a material belt input to the pole piece slitting system to form a pole piece and conveying the pole piece, and the pole piece comprises a main body part and pole lugs located on the two sides; the second cutting mechanism is used for receiving the pole piece conveyed by the first cutting mechanism and cutting the pole piece into a first pole piece and a second pole piece, and each of the first pole piece and the second pole piece comprises a pole lug located on one side; and the deviation rectifying mechanism is used for acquiring images of the first pole piece and the second pole piece, and rectifying the position of the material belt cut by the first cutting mechanism and / or the position of the pole piece cut by the second cutting mechanism based on the images, so that the width size of the first pole piece and the width size of the second pole piece formed after deviation rectifying are consistent. According to the pole piece slitting system, the layout of the pole piece slitting system can be simplified while the pole piece slitting precision is kept high.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole piece cutting system and battery production equipment. Background Art

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

[0003] In the process of preparing the pole pieces of the battery, it is usually necessary to cut the large pole piece material into small pieces that meet the size requirements.

[0004] However, in order to obtain small pieces of electrodes with consistent specifications, the current electrode cutting system has a complicated structure, resulting in a relatively complex layout of the electrode cutting system. Utility Model Content

[0005] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide a pole piece cutting system and a battery production equipment to solve the above technical problems.

[0006] An embodiment of the first aspect of the present application provides a pole piece slitting system, comprising: a first cutting mechanism, for cutting a material strip input into the pole piece slitting system to form pole pieces and conveying the pole pieces, the pole pieces comprising pole ears on both sides; a second cutting mechanism, for receiving the pole pieces conveyed by the first cutting mechanism, and slitting the pole pieces into a first pole piece and a second pole piece, the first pole piece and the second pole piece both comprising a pole ear on one side; a correction mechanism, for acquiring images of the first pole piece and the second pole piece, and based on the image, correcting the position of the first cutting mechanism cutting the material strip and / or correcting the position of the second cutting mechanism cutting the pole piece, so that the width dimensions of the first pole piece and the second pole piece formed after the correction are consistent.

[0007] In the technical solution of the embodiment of the present application, a correction mechanism is provided to correct the first cutting mechanism and / or the second cutting mechanism based on the actual image of the first pole piece and the second pole piece that have been cut, so as to improve the accuracy of pole piece cutting. Moreover, compared with using different correction mechanisms to correct the position of the first cutting mechanism cutting the material strip and the position of the second cutting mechanism cutting the pole piece, only one correction mechanism is provided to correct the position of the first cutting mechanism cutting the material strip and the position of the second cutting mechanism cutting the pole piece based on the image of the same first pole piece and the second pole piece, so as to simplify the structure of the pole piece cutting system and simplify the layout.

[0008] In some embodiments, the material strip includes a first part and a second part located on opposite sides of the first part, and an identification layer is provided on the edge of the first part near the second part; the first cutting mechanism is used to cut the second part to form a pole ear; the second cutting mechanism is used to cut the pole piece along the center line of the first part to form a first pole piece and a second pole piece, and the part of the first part except the identification layer is used to form the main body of the first pole piece and the second pole piece respectively, and the pole ear is located on one side of the main body; the correction mechanism is used to obtain the first width of the identification layer in the first pole piece and the second pole piece based on the image, and correct the position of the first cutting mechanism cutting the material strip based on the difference between the two first widths, and is also used to obtain the second width of the main body in the first pole piece and the second pole piece based on the image, and correct the position of the pole piece cut by the second cutting mechanism based on the difference between the two second widths. In this way, the correction mechanism can determine whether it is necessary to correct the position of the first cutting mechanism cutting the material strip or the position of the second cutting mechanism cutting the electrode based on the images of the first electrode piece and the second electrode piece, so that a correction mechanism can correct the first cutting mechanism and / or the second cutting mechanism based on the same image, simplifying the layout of the electrode piece cutting system.

[0009] In some embodiments, the correction mechanism includes: a visual detection device, which is arranged on the side of the second cutting mechanism away from the first cutting mechanism, and is used to obtain images of the first pole piece and the second pole piece; a correction device, which is used to transmit the material belt input to the pole piece slitting system to the first cutting mechanism; a controller, which is used to receive the image; and the controller is also used to control the correction device to adjust the transmission direction of the material belt based on the image. Thus, the controller can adjust the positional relationship between the first cutting mechanism or the second cutting mechanism and the material belt by controlling the transmission direction of the material belt, so as to correct the first cutting mechanism or the second cutting mechanism and improve the accuracy of slitting the pole pieces.

[0010] In some embodiments, the deflection correction device includes: a deflection correction roller for conveying the material belt; a sensor, the sensor is arranged corresponding to the first part of the material belt, and is used to detect the position of the first edge of the identification layer away from the second part; and a controller is used to control the rotation of the deflection correction roller based on the image and the position of the first edge detected by the sensor to adjust the transmission direction of the material belt. The sensor detects the position of the first edge of the identification layer to locate the current position of the material belt, and the controller controls the rotation of the deflection correction roller based on the image and the current position of the material belt to adjust the transmission direction of the material belt, thereby adjusting the position of the first cutting mechanism cutting the material or adjusting the position of the second cutting mechanism cutting the pole piece to achieve deflection correction.

[0011] In some embodiments, the first cutting mechanism includes a laser cutting device, which is used to cut the material strip by laser, and the controller is used to control the position of the laser light path emitted by the laser cutting device to correct the position of the cutting material strip, and the controller is also used to control the correction device to adjust the transmission direction of the material strip to correct the position of the second cutting mechanism cutting the pole piece. In this way, when it is only necessary to correct the position of the first cutting mechanism cutting the material strip, it is only necessary to adjust the position of the laser light path without adjusting the transmission direction of the material strip, so that the position of the second cutting mechanism cutting the pole piece will not change, and will not affect the accuracy of the second cutting mechanism cutting the pole piece. When adjusting the transmission direction of the material strip to correct the position of the second cutting mechanism cutting the pole piece, in order not to affect the cutting position of the first cutting mechanism on the material strip, the position of the laser light path can also be adjusted in linkage, so that the laser light path maintains a relative position with the material strip unchanged, so that the same correction mechanism can correct the first cutting mechanism and the second cutting mechanism respectively.

[0012] In some embodiments, the visual inspection device includes a macro camera. The macro camera is small in size and can obtain images of the first pole piece and the second pole piece without occupying too much space, further simplifying the layout of the pole piece cutting system.

[0013] In some embodiments, the pole piece slitting system further includes: an unwinding mechanism, which is arranged on the side of the first cutting mechanism away from the second cutting mechanism, and is used to unwind the material tape input to the pole piece slitting system for conveying it to the first cutting mechanism; a first driving mechanism, which is used to drive the material tape unwound by the unwinding mechanism to be conveyed to the first cutting mechanism; and a rewinding mechanism, which is arranged on the side of the second cutting mechanism away from the first cutting mechanism, and is used to rewind the first pole piece and the second pole piece. The first driving mechanism is arranged to drive the material tape unwound by the unwinding mechanism to be conveyed to the first cutting mechanism, so that the material tape maintains a certain tension during the transmission process, which is conducive to controlling the position of the first cutting mechanism to cut the material tape and controlling the position of the second cutting mechanism to cut the material tape in accordance with expectations, thereby improving the slitting accuracy of the pole piece.

[0014] In some embodiments, the first driving mechanism includes: a first mounting structure; a first driving roller, rotatably mounted on the first mounting structure; a first pressing roller, rotatably mounted on the first mounting structure and arranged opposite to the first driving roller to define a first pressing gap with the first driving roller, the unwinding mechanism is used to convey the material strip to the first pressing gap, and the first driving roller is used to rotate to drive the material strip to be conveyed to the first cutting mechanism through the first pressing gap. Through the first pressing gap, the conveying direction of the material strip can be limited while driving the material strip to be conveyed, so that the conveying direction of the material strip meets expectations, which is conducive to controlling the position of the first cutting mechanism to cut the material strip and the position of the second cutting mechanism to cut the material strip to meet expectations, thereby improving the cutting accuracy of the pole piece.

[0015] In some embodiments, the pole piece slitting system further includes: a second driving mechanism, which is arranged between the second cutting mechanism and the winding mechanism, and the second driving mechanism is used to drive the first pole piece and the second pole piece to be transported to the winding mechanism. As a result, the first pole piece and the second pole piece output by the second cutting mechanism maintain a certain tension, which is beneficial to improve the flatness of the winding of the first pole piece and the second pole piece by the winding mechanism. In addition, the second driving mechanism can cooperate with the first driving mechanism to achieve a certain tension of the material strip during the entire transmission process, which is beneficial to further control the position of the first cutting mechanism cutting the material strip and control the position of the second cutting mechanism cutting the material strip in accordance with expectations.

[0016] In some embodiments, the second driving mechanism includes: two second mounting structures; two second driving rollers, which are rotatably mounted on the two second mounting structures; two second pressing rollers, which are rotatably mounted on the two second mounting structures, and are arranged opposite to the second driving rollers on the second mounting structures where they are located, so as to define a second pressing gap with the second driving roller, and the second driving roller is used to rotate to drive the first pole piece and the second pole piece to be respectively conveyed to the winding mechanism through the corresponding second pressing gap. Through the second pressing gap, the conveying direction of the pole piece can be limited while driving the pole piece to be conveyed, so that the conveying direction of the pole piece of the material strip meets expectations, which is conducive to improving the flatness of the winding mechanism for the first pole piece and the second pole piece, and controlling the position of the first cutting mechanism to cut the material strip and controlling the position of the second cutting mechanism to cut the material strip meet expectations.

[0017] In some embodiments, the electrode slitting system further includes: a tension adjustment mechanism, which is used to adjust the tension of the first electrode and the second electrode output by the second cutting mechanism and then transmit them to the second driving mechanism. In this way, the problem that the second driving mechanism drives the first electrode and the second electrode poorly due to the tension of the first electrode and the second electrode output by the second cutting mechanism is too small can be avoided to a certain extent, and the problem that the second driving mechanism drives the first electrode and the second electrode broken due to the tension of the first electrode and the second electrode output by the second cutting mechanism is too large can also be avoided to a certain extent, and the tension between the first driving mechanism and the second driving mechanism is balanced.

[0018] In some embodiments, the tension adjustment mechanism includes: two tension adjustment components, the two tension adjustment components are used to adjust the tension of the first pole piece and the second pole piece respectively, and the tension adjustment component includes: a third mounting structure; at least one tension adjustment roller, the tension adjustment roller is used to convey the first pole piece or the second pole piece; a mounting portion, the mounting portion is movably mounted on the third mounting structure along a first direction, the tension adjustment roller is rotatably mounted on the mounting portion, and the first direction is perpendicular to the extension direction of the tension adjustment roller; a tension adjustment controller, which is used to control the mounting portion to move along the first direction to drive the tension adjustment roller to move along the first direction, thereby adjusting the distance between the tension adjustment roller and the second driving mechanism. When the tension of the first pole piece or the second pole piece is too large, the tension of the first pole piece or the second pole piece transmitted between the tension adjustment roller and the second driving mechanism is too large. Based on this, the distance between the tension adjustment roller and the second driving mechanism can be reduced to reduce the tension of the first pole piece or the second pole piece. Conversely, when the first pole piece or the second pole piece transmitted between the tension adjustment roller and the second driving mechanism is too loose, the distance between the tension adjustment roller and the second driving mechanism can be increased to tighten the first pole piece or the second pole piece. By driving the tension adjustment roller to move along the first direction, the tension of the first pole piece and the second pole piece transported between the second cutting mechanism and the second driving mechanism can be adjusted, thereby achieving adjustment of the tension of the first pole piece and the second pole piece.

[0019] In some embodiments, the unwinding mechanism includes: a first unwinding structure and a second unwinding structure arranged at intervals, both of which are used to load the material tape; an unwinding and reeling structure, which is used to reel the material tape loaded by the first unwinding structure and the second unwinding structure, so that one of the first unwinding structure and the second unwinding structure unwinds the material tape to the first cutting mechanism. In this way, the unwinding mechanism can be used in one standby mode, which helps to shorten the waiting time for the unwinding mechanism to load materials and improve the efficiency of the electrode slitting system in slitting the electrode.

[0020] In some embodiments, the winding mechanism includes a first winding assembly and a second winding assembly; wherein the first winding assembly includes: a first winding structure and a second winding structure arranged at intervals, both of which are used to wind up the first pole piece, and a first winding and rewinding structure, used to control one of the first winding structure and the second winding structure to wind up the first pole piece; the second winding assembly includes: a third winding structure and a fourth winding structure arranged at intervals, both of which are used to wind up the second pole piece, and a second winding and rewinding structure, used to control one of the third winding structure and the fourth winding structure to wind up the second pole piece. In this way, the winding mechanism can be used in one standby and one in another, which helps to shorten the time for the winding mechanism to rewind materials and improve the efficiency of the pole piece slitting system in slitting pole pieces.

[0021] An embodiment of the second aspect of the present application provides a battery production device, which includes the pole piece cutting system in the above embodiment.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0024] Figure 1 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0025] Figure 2 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0026] Figure 3 A functional block diagram of a pole piece cutting system according to some embodiments of the present application;

[0027] Figure 4 This is a schematic diagram of the structure of the material strips in some embodiments of the present application;

[0028] Figure 5 This is a schematic diagram of the structure of the pole piece of some embodiments of the present application;

[0029] Figure 6 A schematic diagram of the structure of a pole piece cutting system in some embodiments of the present application;

[0030] Figure 7 This is a schematic structural diagram of a first driving mechanism in some embodiments of the present application;

[0031] Figure 8 This is a schematic structural diagram of the tension adjustment assembly of some embodiments of the present application.

[0032] Description of reference numerals:

[0033] Visual inspection device 1121, deviation correction device 1122, first unwinding structure 1131, second unwinding structure 1132, unwinding and rewinding structure 1133, first mounting structure 1141, first driving roller 1142, first pressing roller 1143, first driving motor 1144, tension adjustment assembly 1161, first winding assembly 1171, second winding assembly 1172;

[0034] Battery 100, pole piece cutting system 101, first cutting mechanism 110, second cutting mechanism 111, deviation correction mechanism 112, unwinding mechanism 113, first driving mechanism 114, second driving mechanism 115, winding mechanism 117;

[0035] First part 301, second part 302, identification layer 303;

[0036] Box body 10, first part 11, second part 12;

[0037] Battery cell 20, end cap 21, electrode terminal 21a, housing 22, electrode assembly 23, tab 23a, material strip 29;

[0038] A pole piece 30, a first pole piece 31, and a second pole piece 32;

[0039] A tension adjustment roller 41, a mounting portion 42, a tension adjustment controller 43, a slide rail 44, and a slider 45;

[0040] A first winding structure 51, a second winding structure 52, and a first winding and roll changing structure 53;

[0041] A third winding structure 61, a fourth winding structure 62, and a second winding and changing structure 63;

[0042] First width W1, second width W2, first direction X. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0052] In the production process of pole pieces, it is usually necessary to cut large pieces of pole piece materials to prepare small pieces of pole pieces that meet the size requirements. For example, the pole piece cutting system may include a die-cutting mechanism and a slitting mechanism. The die-cutting mechanism is used to die-cut the material strip into large pieces of pole pieces, and the slitting mechanism is used to divide the large pieces of pole pieces into two to form small pieces of pole pieces. In order to ensure that the widths of the small pieces of pole pieces divided into two are equal, a correction device is added in front of the die-cutting mechanism and the slitting mechanism to correct the die-cutting mechanism and the slitting mechanism respectively, resulting in many components in the pole piece slitting system, complex layout, and relatively large size.

[0053] In addition, since the deviation correction device before the slitting mechanism is located between the die-cutting mechanism and the slitting mechanism, the distance between the slitting mechanism and the die-cutting mechanism is relatively far, resulting in a hysteresis in the deviation correction. That is, after the die-cutting mechanism is rectified, since the electrode piece needs to be transmitted from the die-cutting mechanism to the slitting mechanism over a relatively long distance, during this transmission process, the transmission of the electrode piece may be deviated, causing the position of the electrode piece transmitted to the slitting mechanism to deviate from the expected position, thereby causing the slitting mechanism to deviate from the cutting position of the electrode piece.

[0054] Based on the above considerations, a pole piece cutting system is designed, including: a first cutting mechanism, a second cutting mechanism and a correction mechanism. The first cutting mechanism cuts the material strip to form pole pieces, and conveys the first cutting mechanism to the second cutting mechanism, and the second cutting mechanism cuts the pole pieces to form the first pole piece and the second pole piece. The correction mechanism corrects the first cutting mechanism and / or the second cutting mechanism based on the actual images of the first pole piece and the second pole piece that have been cut, which can improve the accuracy of pole piece cutting. In addition, compared with using different correction mechanisms to correct the position of the first cutting mechanism cutting the material strip and the position of the second cutting mechanism cutting the pole piece, only by setting a correction mechanism based on the image of the same first pole piece and the second pole piece, the position of the first cutting mechanism cutting the material strip and the position of the second cutting mechanism cutting the pole piece can be corrected, which can simplify the structure of the pole piece cutting system and simplify the layout.

[0055] In addition, since the second cutting mechanism directly receives the electrode sheets conveyed by the first cutting mechanism, that is, the second cutting mechanism is directly arranged after the first cutting mechanism, the transmission distance of the electrode sheets between the first cutting mechanism and the second cutting mechanism can be shortened, and the problem of lagging adjustment of the deviation correction caused by the long distance between the slitting mechanism and the die-cutting mechanism can be improved, and the deviation correction accuracy can be improved to further improve the accuracy of slitting the electrode sheets.

[0056] The pole piece cutting system of the embodiment of the present application can be used to prepare pole pieces, and the pole pieces can be used to form batteries.

[0057] Please refer to Figure 1 , Figure 1 Schematic diagram of the exploded structure of the battery provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. Among them, the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20.

[0058] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection, where mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0059] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0060] Please refer to Figure 2 , Figure 2 The schematic diagram of the decomposition structure of a battery cell provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit that constitutes a battery. Figure 2 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23 and other functional components. Functional components such as electrode terminals 21a may be provided on the end cap 21. The electrode terminals 21a may be used to electrically connect to the electrode assembly 23 to output or input electrical energy of the battery cell 20.

[0061] The housing 22 is a component used to cooperate with the end cover 21 to form an internal environment of the battery cell 20 , wherein the formed internal environment can be used to accommodate the electrode assembly 23 , electrolyte and other components.

[0062] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. Active substances are present on part of the surface of the positive and negative electrode sheets, and the parts of the positive and negative electrode sheets that do not have active substances each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the positive and negative electrode sheets or at both ends of the positive and negative electrode sheets, respectively. During the charge and discharge process of the battery, the positive active substance and the negative active substance react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0063] The first electrode sheet in the embodiment of the present application can be used as a positive electrode sheet or a negative electrode sheet, and the second electrode sheet can be used as a positive electrode sheet or a negative electrode sheet.

[0064] refer to Figure 3 The embodiment of the present application provides a pole piece cutting system 101, comprising: a first cutting mechanism 110, for cutting the material strip input to the pole piece cutting system 101 to form pole pieces 30 and conveying the pole pieces 30, the pole pieces 30 comprising pole ears on both sides; a second cutting mechanism 111, for receiving the pole pieces 30 conveyed by the first cutting mechanism 110, and cutting the pole pieces 30 into a first pole piece 31 and a second pole piece 32, the first pole piece 31 and the second pole piece 32 both comprising pole ears on one side; a correction mechanism 112, for acquiring images of the first pole piece 31 and the second pole piece 32, and based on the images, correcting the position of the first cutting mechanism 110 cutting the material strip and / or correcting the position of the second cutting mechanism 111 cutting the pole pieces 30, so that the width dimensions of the first pole piece 31 and the second pole piece 32 formed after the correction are consistent.

[0065] The material strip may include a current collector and an active material layer located on a portion of the surface of the current collector.

[0066] The current collector may include a metal material. For example, the current collector may include aluminum, copper, lithium metal, and the like.

[0067] The active material layer may include polymer materials, conductive materials, etc. The polymer materials may include but are not limited to rubber, plastic, etc. The conductive materials include but are not limited to metal materials, semiconductor conductive materials, polymer conductive materials, etc.

[0068] The active material layer may include, but is not limited to, one of a positive electrode active material layer and a negative electrode active material layer. The positive electrode active material layer and the negative electrode active material layer may react with the electrolyte to charge the battery. The positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, and the negative electrode active material may be carbon or silicon, etc. The material strip having the positive electrode active material layer may be used to form a positive electrode sheet after forming the first electrode sheet 31 or the second electrode sheet 32, and the material strip having the negative electrode active material layer may be used to form a negative electrode sheet after forming the first electrode sheet 31 or the second electrode sheet 32.

[0069] In some embodiments, both surfaces of the material strip may have an active material layer. In other embodiments, one surface of the material strip may have an active material layer.

[0070] The first cutting mechanism 110 can cut the portion of the material strip without the active material layer to form the tabs of the pole piece 30. The tabs are located on both sides of the pole piece 30. Exemplarily, the first cutting mechanism 110 can die-cut the material strip, and die-cutting refers to cutting the material strip into the pole piece 30 according to a predetermined shape.

[0071] The first cutting mechanism 110 directly transports the electrode sheet 30 to the second cutting mechanism 111, and the second cutting mechanism 111 can cut the electrode sheet 30 along the center line of the electrode sheet 30 to form a first electrode sheet 31 and a second electrode sheet 32. The center line referred to here is perpendicular to the arrangement direction of the pole ears on both sides of the electrode sheet 30, so that the first electrode sheet 31 and the second electrode sheet 32 ​​formed both include pole ears located on one side. Exemplarily, the first electrode sheet 31 and the second electrode sheet 32 ​​both include a main body, and the pole ears are located on one side of the main body, wherein the surface of the main body has an active material layer, and the surface of the pole ears does not have an active material layer.

[0072] The image of the first pole piece 31 and the second pole piece 32 shows the surface of the first pole piece 31 and the second pole piece 32 to show the complete image of the tabs and the main body of the first pole piece 31 and the second pole piece 32 .

[0073] The consistency in width dimensions of the first pole piece 31 and the second pole piece 32 can be: in the direction from the main body to the pole ear, the maximum widths of the first pole piece 31 and the second pole piece 32 are consistent, and the minimum widths are also consistent, wherein the width dimension of the pole ear of the first pole piece 31 is consistent with the width dimension of the pole ear of the second pole piece 32, and the width dimension of the main body of the first pole piece 31 is consistent with the width dimension of the main body of the second pole piece 32.

[0074] As can be seen from the above, the first cutting mechanism 110 is used to cut out the tabs, and the second cutting mechanism 111 is used to cut the positions of the pole piece 30 other than the tabs, that is, the positions where the first cutting mechanism 110 and the second cutting mechanism 111 cut the material strip are different. Based on this, the correction mechanism 112 can obtain the shape and size of the positions of the first pole piece 31 and the second pole piece 32 cut by the first cutting mechanism 110 and the second cutting mechanism 111 respectively based on the images of the same first pole piece 31 and the second pole piece 32, so as to correct the positions where the first cutting mechanism 110 cuts the material strip and the second cutting mechanism 111 cuts the pole piece 30 respectively.

[0075] The correction mechanism 112 corrects the position of the first cutting mechanism 110 cutting the material strip and / or corrects the position of the second cutting mechanism 111 cutting the pole piece 30 so that the width dimensions of the first pole piece 31 and the second pole piece 32 formed after the correction are consistent. This means that the pole piece 30 mechanism can only correct the position of the first cutting mechanism 110 cutting the material strip so that the width dimensions of the first pole piece 31 and the second pole piece 32 are consistent; it can also only correct the position of the second cutting mechanism 111 cutting the pole piece 30 so that the width dimensions of the first pole piece 31 and the second pole piece 32 are consistent; it can also correct both the position of the first cutting mechanism 110 cutting the material strip and the position of the second cutting mechanism 111 cutting the pole piece 30 so that the width dimensions of the first pole piece 31 and the second pole piece 32 are consistent. How to correct the deviation specifically needs to be determined based on the images of the first pole piece 31 and the second pole piece 32.

[0076] Exemplarily, if it is determined from the images of the first pole piece 31 and the second pole piece 32 that the widths of the pole lugs of the first pole piece 31 and the pole lugs of the second pole piece 32 are inconsistent, and the widths of the remaining parts except the pole lugs are consistent, the deviation correction mechanism 112 corrects the position of the first cutting mechanism 110 cutting the material strip. If it is determined from the images of the first pole piece 31 and the second pole piece 32 that the widths of the parts except the pole lugs of the first pole piece 31 and the second pole piece 32 are inconsistent, but the widths of the pole lugs are consistent, the deviation correction mechanism 112 corrects the position of the second cutting mechanism 111 cutting the pole piece 30. If it is determined from the images of the first pole piece 31 and the second pole piece 32 that the widths of the pole lugs and the parts except the pole lugs of the first pole piece 31 and the second pole piece 32 are inconsistent, the deviation correction mechanism 112 corrects both the position of the first cutting mechanism 110 cutting the material strip and the position of the second cutting mechanism 111 cutting the pole piece 30.

[0077] In the above technical solution, the correction mechanism 112 is set to correct the first cutting mechanism 110 and / or the second cutting mechanism 111 based on the actual image of the first pole piece 31 and the second pole piece 32 that have been cut, which can improve the accuracy of cutting the pole piece 30. In addition, compared with using different correction mechanisms 112 to correct the position of the first cutting mechanism 110 cutting the material strip and the position of the second cutting mechanism 111 cutting the pole piece 30, only one correction mechanism 112 is set based on the image of the same first pole piece 31 and the second pole piece 32 to correct the position of the first cutting mechanism 110 cutting the material strip and the position of the second cutting mechanism 111 cutting the pole piece 30. That is to say, only the same image can be used to indicate whether to correct the first cutting mechanism 110 and the second cutting mechanism 111, without using two correcting mechanisms 112 to respectively detect the pole piece 30 output by the first cutting mechanism 110 and the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111, so that the first cutting mechanism 110 and the second cutting mechanism 111 can share the same correcting mechanism 112, thereby streamlining the structure of the pole piece cutting system 101 and simplifying the layout.

[0078] In addition, since the second cutting mechanism 111 directly receives the electrode piece 30 delivered by the first cutting mechanism 110, the transmission distance of the electrode piece 30 between the first cutting mechanism 110 and the second cutting mechanism 111 can be shortened, and the probability of deviation of the electrode piece 30 during the transmission from the first cutting mechanism 110 to the second cutting mechanism 111 is reduced, thereby improving the problem of lagging adjustment of the correction due to the long distance between the slitting mechanism and the die-cutting mechanism, improving the correction accuracy, and further improving the accuracy of slitting the electrode piece 30.

[0079] refer to Figure 4 as well as Figure 5According to some embodiments of the present application, the material strip includes a first portion 301 and a second portion 302 located on opposite sides of the first portion 301, and an identification layer 303 is provided on an edge of the first portion 301 close to the second portion 302; the first cutting mechanism 110 is used to cut the second portion 302 to form a pole ear 23a; the second cutting mechanism 111 is used to cut the pole piece 30 along the center line of the first portion 301 to form a first pole piece 31 and a second pole piece 32, and the portion of the first portion 301 other than the identification layer 303 is used to form the first pole piece 23a and the second pole piece 23a. 31 and the main body of the second pole piece 32, and the pole ear 23a is located on one side of the main body; the correction mechanism 112 is used to obtain the first width W1 of the identification layer 303 in the first pole piece 31 and the second pole piece 32 based on the image, and correct the position of the cutting strip by the first cutting mechanism 110 based on the difference between the two first widths W1, and is also used to obtain the second width W2 of the main body in the first pole piece 31 and the second pole piece 32 based on the image, and correct the position of the second cutting mechanism 111 cutting the pole piece 30 based on the difference between the two second widths W2.

[0080] The two second parts 302 may have the same size, an active material layer may be provided on the surface of the first part 301 to form the main body of the first electrode sheet 31 and the second electrode sheet 32 ​​, and the second part 302 has no active material layer to form the electrode tab 23 a .

[0081] Since there are two second parts 302, there are also two identification layers 303 on the first part 301. The two identification layers 303 are arranged at intervals and are respectively located at two edges of the first part 303 close to the second part 301. The material of the identification layer 303 can be an insulating material, and the edges of the two identification layers 303 that are away from each other coincide with the boundary line between the first part 301 and the second part 302.

[0082] The first width W1 and the second width W2 are both widths of the first pole piece 31 and the second pole piece 32 in a direction from the pole ear 23 a to the main body.

[0083] The first cutting mechanism 110 can cut along the cutting line of the material strip, and the cutting line can include a first cutting line and a second cutting line that are alternately connected, the first cutting line encloses the shape of the pole ear 23a, and the second cutting line coincides with the identification layer 303. It can be understood that the first cutting mechanism 110 usually cuts the material strip according to a designed template, and the desired shape can be cut by aligning the template with the cutting line of the material strip. Exemplarily, the first cutting mechanism 110 can include a die-cutting knife, and the die-cutting knife can be used to combine a die-cutting plate according to the shape of the cutting line of the material strip, or the first cutting mechanism 110 can include a laser cutting device, and the optical path of the laser emitted by the laser cutting device is the same as the direction of the cutting line, and the spacing distance between the two lasers corresponding to the two cutting lines is also the same as the spacing distance between the two cutting lines.

[0084] If the template is not aligned with the cutting line, for example, if the template is biased to the right compared to the material tape, the first cutting mechanism 110 will cut the identification layer 303 on the left side of the material tape but not the identification layer 303 on the right side of the material tape; if the template is biased to the left compared to the material tape, the first cutting mechanism 110 will cut the identification layer 303 on the right side of the material tape but not the identification layer 303 on the left side of the material tape, thereby causing the shapes and sizes of the two identification layers 303 to be inconsistent.

[0085] It can be seen that by obtaining the difference between the first width W1 of the identification layer 303 of the first electrode piece 31 and the second electrode piece 32, it can be determined whether it is necessary to correct the position of the material strip cut by the first cutting mechanism 110. If the difference between the two first widths W1 is 0, it is not necessary to correct the position of the material strip cut by the first cutting mechanism 110. If the difference between the two first widths W1 is not 0, it is necessary to correct the position of the material strip cut by the first cutting mechanism 110.

[0086] The surface of the first part 301 without the identification layer 303 is provided with an active material layer, and the pole ears 23a on both sides of the pole piece 30 are respectively located at the midline of the first part 301 (such as Figure 5 301, and the two identification layers 303 are symmetrically distributed along the midline of the first part 301. In this way, after the cutter of the second cutting mechanism 111 cuts along the midline of the first part 301, the first part 301 is divided into two parts of equal width, and the part of each part except the identification layer 303 constitutes the main body of the first pole piece 31 or the second pole piece 32 due to the active material layer. Since the widths of the two identification layers 303 are consistent, the widths of the main bodies of the formed first pole piece 31 and the second pole piece 32 are consistent.

[0087] Therefore, if the second cutting mechanism 111 does not cut along the center line of the first portion 301, the second widths W2 of the main body of the first pole piece 31 and the second pole piece 32 are inconsistent. Based on this, by obtaining the difference between the second widths W2 of the main body of the first pole piece 31 and the second pole piece 32, it can be determined whether it is necessary to correct the position of the pole piece 30 cut by the second cutting mechanism 111. If the difference between the two second widths W2 is 0, there is no need to correct the position of the pole piece 30 cut by the second cutting mechanism 111. If the difference between the two second widths W2 is not 0, it is necessary to correct the position of the pole piece 30 cut by the second cutting mechanism 111.

[0088] In the above technical solution, the correction mechanism 112 can determine whether it is necessary to correct the position of the first cutting mechanism 110 cutting the material strip or the position of the second cutting mechanism 111 cutting the electrode 30 based on the images of the first electrode 31 and the second electrode 32, so that a correction mechanism 112 can correct the first cutting mechanism 110 and / or the second cutting mechanism 111 based on the same image, thereby simplifying the layout of the electrode cutting system 101.

[0089] refer to Figure 6 According to some embodiments of the present application, the correcting mechanism 112 includes: a visual inspection device 1121, which is arranged on the side of the second cutting mechanism 111 away from the first cutting mechanism 110, and is used to obtain images of the first pole piece 31 and the second pole piece 32; a correcting device 1122, which is used to transmit the material strip 29 input to the pole piece cutting system 101 to the first cutting mechanism 110; a controller, which is used to receive the image; the controller is also used to control the correcting device 1122 to adjust the transmission direction of the material strip 29 based on the image.

[0090] The visual inspection device 1121 can detect the image of the first pole piece 31 and the image of the second pole piece 32 respectively. The controller is used to receive the image of the first pole piece 31 and the image of the second pole piece 32, and obtain the first width of the identification layer 303 of the first pole piece 31 and the second width of the main body based on the image of the first pole piece 31, and obtain the first width of the identification layer 303 and the second width of the main body of the second pole piece 32 based on the image of the second pole piece 32. The controller also determines whether it is necessary to correct the position of the first cutting mechanism 110 cutting the material strip 29 based on the difference between the two first widths and the difference between the two second widths, and based on the difference between the two first widths, and determines whether it is necessary to correct the position of the second cutting mechanism 111 cutting the material strip 29 based on the difference between the two second widths.

[0091] In some embodiments, the controller may be integrated with image processing software to implement the size measurement function in the image. The image processing software may be any computer program software known to those skilled in the art that can extract the edge of the pole ear 23a and the edge of the main body of the first pole piece 31 and the second pole piece 32 in the image and obtain the above-mentioned first width and second width.

[0092] In some embodiments, the controller may perform various mathematical operations through built-in mathematical functions and instructions, so as to obtain the difference between the two first widths and the difference between the two second widths.

[0093] In some embodiments, the controller can determine the data through internal logical operations, so as to control the correction device 1122, the first cutting mechanism 110 and the second cutting mechanism 111 based on the difference between the two first widths and the difference between the two second widths.

[0094] In some embodiments, the controller may be a PLC (Programmable Logic Controller).

[0095] It is understandable that the deflection correction device 1122 is used to transfer the material strip 29 to the first cutting mechanism 110, and the first cutting mechanism 110 transfers the pole piece 30 formed by cutting the material strip 29 to the second cutting mechanism 111. If the deflection correction device 1122 adjusts the transmission direction of the material strip 29, the positional relationship between the first cutting mechanism 110 and the material strip 29 will change, resulting in a change in the transmission direction of the pole piece 30 output by the first cutting mechanism 110, thereby causing the relative position between the second cutting mechanism 111 and the pole piece 30 to change. In other words, the deflection correction device 1122 adjusts the transmission direction of the material strip 29, resulting in a change in the relative position between the first cutting mechanism 110 and the second cutting mechanism 111 and the pole piece 30, which will cause the first cutting mechanism 110, which does not need deflection correction, to change the cutting position of the material strip 29 or the second cutting mechanism 111 to change the cutting position of the pole piece 30, thereby causing the problem of reduced cutting accuracy.

[0096] Based on the above considerations, in some embodiments, the controller can control the first cutting mechanism 110 to correct the position of the cut material strip 29 based on the image, and control the correction device 1122 to adjust the transmission direction of the material strip 29 based on the image, so as to correct the position of the second cutting mechanism 111 cutting the pole piece 30. In other embodiments, the controller can control the correction device 1122 to adjust the transmission direction of the material strip 29 based on the image, so as to correct the position of the first cutting mechanism 110 cutting the material strip 29, and control the second cutting mechanism 111 to correct the position of the cut pole piece 30 based on the image.

[0097] In a feasible manner of the embodiment of the present application, when the position of the first cutting mechanism 110 cutting the material strip 29 is offset, the controller directly controls the first cutting mechanism 110 to correct the position of the cutting material strip 29, and when the position of the second cutting mechanism 111 cutting the pole piece 30 is offset, the controller controls the correction device 1122 to adjust the transmission direction of the material strip 29 to correct the position of the second cutting mechanism 111 cutting the pole piece 30. In this way, when the position of the first cutting mechanism 110 cutting the material strip 29 is corrected, the position of the second cutting mechanism 111 cutting the pole piece 30 will not change. When the deviation correction device 1122 is controlled to adjust the transmission direction of the material belt 29 to correct the position of the second cutting mechanism 111 cutting the pole piece 30, the positional relationship between the cutting template of the first cutting mechanism 110 and the material belt 29 will also change accordingly. However, since the controller can directly control the first cutting mechanism 110 to correct the position of the cutting material belt 29, it is only necessary to control the cutting template of the first cutting mechanism 110 to offset the same amount in the same direction relative to the material belt 29 while adjusting the transmission direction of the material belt 29. For example, the controller can simultaneously control the deviation correction device 1122 to adjust the material belt 29 to offset 1mm to the left, and the cutting template of the first cutting mechanism 110 to offset 1mm to the left, so that the cutting template of the first cutting mechanism 110 moves simultaneously with the material belt 29, so that the position of the cutting pole piece 30 of the second cutting mechanism 111 can be corrected while the position of the cutting material belt 29 of the first cutting mechanism 110 remains unchanged.

[0098] In another feasible manner of the embodiment of the present application, when the position of the first cutting mechanism 110 cutting the material belt 29 is offset, the controller controls the correction device 1122 to adjust the transmission direction of the material belt 29 to correct the position of the first cutting mechanism 110 cutting the material belt 29, and when the position of the second cutting mechanism 111 cutting the pole piece 30 is offset, the controller directly controls the second cutting mechanism 111 to correct the position of the cut pole piece 30. In this way, when the position of the second cutting mechanism 111 cutting the pole piece 30 is corrected, the position of the first cutting mechanism 110 cutting the material belt 29 will not change. When controlling the correction device 1122 to adjust the transmission direction of the material belt 29 to correct the position of the first cutting mechanism 110 cutting the material belt 29, the template used for cutting of the second cutting mechanism 111 can be controlled to be offset in the same direction by the same amount relative to the pole piece 30. Exemplarily, the controller can simultaneously control the correction device 1122 to adjust the material strip 29 to be offset 1 mm to the left, and the template used for cutting of the second cutting mechanism 111 to be offset 1 mm to the left, so that the template used for cutting of the second cutting mechanism 111 moves simultaneously with the pole piece 30, thereby achieving the goal of correcting the position of the first cutting mechanism 110 cutting the material strip 29 while keeping the position of the second cutting mechanism 111 cutting the pole piece 30 unchanged.

[0099] In the above technical solution, the controller can adjust the positional relationship between the first cutting mechanism or the second cutting mechanism and the material tape by controlling the transmission direction of the material tape, thereby correcting the first cutting mechanism or the second cutting mechanism and improving the accuracy of cutting the pole pieces.

[0100] According to some embodiments of the present application, the correcting device 1122 includes: a correcting roller for conveying the material belt 29; a sensor, which is arranged corresponding to the first part 301 of the material belt 29 and is used to detect the position of the first edge of the identification layer 303 away from the second part 302; and a controller is used to control the rotation of the correcting roller based on the image and the position of the first edge detected by the sensor to adjust the transmission direction of the material belt 29.

[0101] In other words, the first edge is an edge where the two second portions are away from each other.

[0102] The controller controls the deflection correction roller to rotate a certain angle, so that an angle is formed between the transmission direction of the material belt 29 and the transmission direction of the material belt 29 when the deflection correction roller is not rotated, thereby changing the transmission direction of the material belt 29.

[0103] The number of sensors can be two, which respectively detect the positions of the first edges of the two identification layers. The controller determines the correction value of the material strip 29 based on the image, and the sensor detects the position of the first edge of the first material strip 29 to use the position of the first edge as a reference position for correction. Based on the correction value and the position of the first edge, the controller controls the correction roller to rotate a certain angle to adjust the position of the first edge in the first cutting mechanism 110 or the position of the first edge in the second cutting mechanism 111. After the correction is completed, the offset value between the position of the first edge detected by the sensor and the position of the first edge detected by the sensor before the correction is exactly equal to the correction value determined by the controller, so that the first cutting mechanism 110 can cut the material strip 29 along the cutting line of the material strip 29, and the position of the cutter of the second cutting mechanism 111 can be aligned with the center line of the first part 301.

[0104] The correction value can be the difference between the first width of the identification layer 303 of the first pole piece 31 and the second pole piece 32, or it can be the difference between the second width of the main body of the first pole piece 31 and the second pole piece 32. The controller can convert the difference between the first width and the second width into the rotation angle of the correction roller through a built-in mathematical function.

[0105] In some embodiments, the number of the deviation correction rollers may be two, and the two deviation correction rollers may be arranged in parallel to improve the ability to control the transmission direction of the material belt 29 .

[0106] In some embodiments, the sensor may include a photoelectric sensor, and the photoelectric sensor may detect the position of the first edge by using the change in the reflection intensity of the light. The number of the photoelectric sensors may be two, and the two photoelectric sensors are arranged at intervals, corresponding to the two first edges respectively. Since the marking layer 303 and the first part 301 on both sides of the first edge are made of different materials, the reflection intensity of the light of the marking layer 303 and the first part 301 on both sides of the first edge is different, and thus the position of the first edge can be detected.

[0107] In the above technical solution, the sensor detects the position of the first edge of the identification layer 303 to locate the position of the current material tape 29. Based on the image and the position of the current material tape 29, the controller controls the rotation of the correction roller to adjust the transmission direction of the material tape 29, thereby adjusting the position of the first cutting mechanism 110 for cutting the material or adjusting the position of the second cutting mechanism 111 for cutting the pole piece 30 to achieve correction.

[0108] It can be understood that, in other embodiments, the correction device 1122 can also be other structures well known to those skilled in the art that can adjust the transmission direction of the material belt 29 based on the correction value.

[0109] like Figure 6 As shown, according to some embodiments of the present application, the first cutting mechanism 110 includes a laser cutting device, which is used to cut the material strip 29 by laser, and the controller is used to control the position of the laser light path emitted by the laser cutting device to correct the position of the cut material strip 29, and the controller is also used to control the correction device 1122 to adjust the transmission direction of the material strip 29 to correct the position of the pole piece 30 cut by the second cutting mechanism 111.

[0110] The laser cutting device may include a servo motor, a laser and a laser cutting head. The controller is communicatively connected to the servo motor and is used to control the servo motor to drive the laser cutting head to move along a predetermined route. For example, it can move along a preset cutting line of the material strip 29. The laser generates laser and emits it through the laser cutting head. As the laser cutting head moves, the material strip 29 is cut.

[0111] The servo motor, laser and laser cutting head have the same meanings as those commonly understood by those skilled in the art.

[0112] The controller can send instructions to the servo motor so that the servo motor drives the laser cutting head to move along a predetermined route. The controller sends instructions to the servo motor so that the servo motor controls the laser cutting head to move along a predetermined route, which is a conventional method used by those skilled in the art and will not be described in detail here.

[0113] The controller obtains the difference in the first width of the two identification layers 303 based on the images of the first pole piece 31 and the second pole piece 32 as the correction value, and sends an instruction with the correction value to the servo motor, so that the servo motor controls the laser cutting head to move the correction value on the basis of the original predetermined route, so that the laser light path moves as a whole by the correction value, thereby being able to correct the position of the cutting strip 29.

[0114] It is understandable that, when the position of the second cutting mechanism 111 cutting the pole piece 30 needs to be corrected, and the position of the first cutting mechanism 110 cutting the material strip 29 does not need to be corrected, the controller controls the correcting device 1122 to adjust the transmission direction of the material strip 29, which will change the relative position between the position of the laser light path emitted by the laser cutting head and the material strip 29. In order to keep the relative position between the position of the laser light path and the material strip 29 unchanged, after the controller controls the correcting device 1122 to correct the material strip 29, when the first cutting mechanism 110 cuts the material strip 29, it can control the laser cutting head to move the same offset on the basis of the original predetermined route.

[0115] Exemplarily, the controller obtains the difference between the second widths of the two main parts based on the images of the first pole piece 31 and the second pole piece 32 as the deviation correction value, and controls the deviation correction device 1122 to adjust the transmission direction of the material strip 29 so that the material strip 29 deviates by the deviation correction value. When the first cutting mechanism 110 cuts the material strip 29, the controller sends a command with the deviation correction value to the servo motor, so that the servo motor controls the laser cutting head to move the deviation value on the basis of the original predetermined route, and keeps the positional relationship between the laser light path emitted by the laser cutting head and the material strip 29 unchanged.

[0116] In the case where the position of the first cutting mechanism 110 cutting the material strip 29 and the position of the second cutting mechanism 111 cutting the pole piece 30 need to be corrected, the controller obtains the difference between the first width of the identification layer 303 of the first pole piece 31 and the first width of the identification layer 303 of the second pole piece 32 as the first correction value based on the images of the first pole piece 31 and the second pole piece 32, and obtains the difference between the second width of the main body of the first pole piece 31 and the second width of the main body of the second pole piece 32 as the second correction value. The controller controls the correction device 1122 to adjust the transmission direction of the material strip 29 so that the material strip 29 deviates from the second correction value. When the first cutting mechanism 110 cuts the material strip 29, the controller sends a command with the sum of the first correction value and the second correction value to the servo motor, so that the servo motor controls the laser cutting head to move the sum of the first correction value and the second correction value on the basis of the original predetermined route. It can be understood that the first deviation correction value and the second deviation correction value can be positive or negative, so the sum of the first deviation correction value and the second deviation correction value can also be positive or negative. If the sum of the first deviation correction value and the second deviation correction value is positive, the servo motor controls the laser cutting head to move in the first direction based on the original predetermined route. If the sum of the first deviation correction value and the second deviation correction value is negative, the servo motor controls the laser cutting head to move in the opposite direction of the first direction based on the original predetermined route. In this way, when the first cutting mechanism 110 cuts the material strip 29, it can eliminate the error caused by the material strip 29 deviating from the first deviation correction value, and at the same time realize the correction of the position of the cut material strip 29.

[0117] In some embodiments, the second cutting mechanism 111 may be a slitting machine, and the slitting machine has the same meaning as that generally understood by those skilled in the art, and the method of slitting the electrode sheet 30 by the slitting machine will not be described in detail herein.

[0118] In the above technical solution, the same deviation correction mechanism 112 can correct the first cutting mechanism 110 and the second cutting mechanism 111 respectively, thereby greatly simplifying the layout of the electrode cutting system 101.

[0119] like Figure 6 As shown, according to some embodiments of the present application, the visual detection device 1121 includes a macro camera.

[0120] The macro camera has the same meaning as that generally understood by those skilled in the art. It mainly focuses the light of the photographed object onto the image sensor through the lens and lens system. The image sensor converts the optical imaging light into an electrical signal and sends it to the image processor of the macro camera. After receiving the electrical signal from the image sensor, the image processor will amplify, filter, denoise and encode it to form the final image.

[0121] The first pole piece 31 and the second pole piece 32 outputted by the second cutting mechanism 111 can be transported by a conveying mechanism in the pole piece cutting system 101. The macro camera photographs the first pole piece 31 and the second pole piece 32 transported by the conveying mechanism.

[0122] There may be multiple macro cameras, and the multiple macro cameras respectively photograph the first pole piece 31 and the second pole piece 32 to obtain images of the first pole piece 31 and the second pole piece 32 .

[0123] The conveying mechanism may include a first conveying roller for conveying the first pole piece 31 and a second conveying roller for conveying the second pole piece 32. Two macro cameras are respectively arranged corresponding to the first conveying roller and the second conveying roller to photograph the first pole piece 31 and the second pole piece 32 respectively.

[0124] In some embodiments, the controller can control the macro camera to acquire images of the first pole piece 31 and the second pole piece 32 at preset intervals. Exemplarily, the visual detection device 1121 may also include two encoders, which are respectively arranged on the first transmission mechanism and the second transmission mechanism. For example, the two encoders can be respectively connected to the rotating shafts of the first transmission roller and the second transmission roller, and rotate with the rotating shaft. The encoder is used to output a pulse signal to the controller according to the angle of rotation, and the controller controls the macro camera to shoot the first pole piece 31 and the second pole piece 32 in response to the pulse signal. For example, a pulse signal can be output to the controller at every preset rotation angle so that the shooting frequency of the macro camera to the first pole piece 31 and the second pole piece 32 is consistent with the transmission speed of the first pole piece 31 and the second pole piece 32.

[0125] In the above technical solution, the macro camera is relatively small in size and can obtain images of the first pole piece 31 and the second pole piece 32 without occupying too much space, thereby further simplifying the layout of the pole piece cutting system 101 .

[0126] like Figure 6 As shown, according to some embodiments of the present application, the pole piece slitting system 101 also includes: a unwinding mechanism 113, which is arranged on the side of the first cutting mechanism 110 away from the second cutting mechanism 111, and is used to unwind the material tape 29 input into the pole piece slitting system 101 to convey it to the first cutting mechanism 110; a first driving mechanism 114, which is used to drive the material tape 29 unwound by the unwinding mechanism 113 to be conveyed to the first cutting mechanism 110; and a winding mechanism 117, which is arranged on the side of the second cutting mechanism 111 away from the first cutting mechanism 110, and is used to wind up the first pole piece 31 and the second pole piece 32.

[0127] That is, the material strip 29 unwound by the unwinding mechanism 113 first passes through the first driving mechanism 114 , and is then transported to the first cutting mechanism 110 after being driven by the first driving mechanism 114 .

[0128] In some embodiments, the deflection correction mechanism 112 includes a deflection correction device 1122, which is used to adjust the transmission direction of the material belt 29 and then transmit the material belt 29 to the first cutting mechanism 110. The first driving mechanism 114 can be arranged before the deflection correction device 1122 to drive the material belt 29 to be transmitted to the deflection correction device 1122, and then the deflection correction device 1122 transmits the material belt 29 to the first cutting mechanism 110. In this way, after the deflection correction device 1122 corrects the deflection of the material belt 29, it does not pass through other mechanisms, but directly transmits the material belt 29 to the first cutting mechanism 110, which can avoid the problem of the material belt 29 being deflected due to passing through other mechanisms to a certain extent, thereby maintaining a high accuracy of deflection correction.

[0129] The first driving mechanism 114 can be any mechanism known to those skilled in the art for driving the transmission of the material belt 29 .

[0130] The unwinding mechanism 113 and the rewinding mechanism 117 can be any mechanism known to those skilled in the art that can perform the unwinding and rewinding functions.

[0131] In the above technical solution, a first driving mechanism 114 is provided to drive the unwinding mechanism 113 to unwind the material strip 29 to the first cutting mechanism 110, so that the material strip 29 maintains a certain tension during the transmission process, which is beneficial to control the position of the first cutting mechanism 110 to cut the material strip 29 and control the position of the second cutting mechanism 111 to cut the material strip 29 as expected, thereby improving the cutting accuracy of the pole piece 30.

[0132] refer to Figure 7 According to some embodiments of the present application, the first driving mechanism 114 includes: a first mounting structure 1141; a first driving roller 1142, rotatably mounted on the first mounting structure 1141; a first pressing roller 1143, rotatably mounted on the first mounting structure 1141, and arranged opposite to the first driving roller 1142 to define a first pressing gap with the first driving roller 1142, the unwinding mechanism 113 is used to convey the material strip 29 to the first pressing gap, and the first driving roller 1142 is used to rotate to drive the material strip 29 to be conveyed to the first cutting mechanism 110 through the first pressing gap.

[0133] The first driving roller 1142 may include a first roller body and a first roller neck, and the first roller neck is arranged at both ends of the first roller body along the extension direction of the first roller body. The first roller neck is also provided with a bearing, and the bearing may include an inner ring and an outer ring sleeved on the outer circumference of the inner ring, and the inner ring is rotatable compared to the outer ring. In one example, there may be a plurality of balls between the outer ring and the inner ring, and the plurality of balls are in contact with both the inner ring and the outer ring, and are configured to drive the inner ring to rotate relative to the outer ring in a rolling manner. The inner ring may be sleeved on the outer circumference of the first roller neck, and the outer ring may be installed on the first mounting structure 1141, so that when the inner ring rotates compared to the outer ring, the first driving roller 1142 is rotated compared to the first mounting structure 1141.

[0134] In some embodiments, the first driving mechanism 114 may further include a first driving motor 1144 , and the first driving motor 1144 is used to drive the bearing to rotate, so as to drive the first driving roller 1142 to rotate.

[0135] The first roller body is arranged opposite to the first pressing roller 1143, and the gap between the first roller body and the first pressing roller 1143 forms a first pressing gap. The end of the first pressing roller 1143 can also be mounted on the first mounting structure 1141 through a bearing, so that the first pressing roller 1143 can rotate relative to the first mounting structure 1141.

[0136] The gap width of the first lamination gap is constructed so that the material belt 29 contacts both the first drive roller 1142 and the first pressure roller 1143. In this way, when the first drive roller 1142 rotates, the two surfaces of the material belt 29 respectively generate friction with the first drive roller 1142 and the first pressure roller 1143, so that the driving force of the first drive roller 1142 can be transmitted to the first pressure roller 1143 through the material belt 29, driving the rotation of the first pressure roller 1143 in contact with the other surface of the material belt 29, thereby driving the material belt 29 to pass through the first lamination gap.

[0137] In the above technical scheme, through the first pressing gap, the conveying direction of the material belt 29 can be limited while driving the material belt 29 to be conveyed, so that the conveying direction of the material belt 29 is in line with expectations, which is beneficial to control the position of the first cutting mechanism 110 cutting the material belt 29 and control the position of the second cutting mechanism 111 cutting the material belt 29 in line with expectations, thereby improving the cutting accuracy of the pole piece 30.

[0138] refer to Figure 6 According to some embodiments of the present application, the pole piece slitting system 101 also includes: a second driving mechanism 115, which is arranged between the second cutting mechanism 111 and the winding mechanism 117, and the second driving mechanism 115 is used to drive the first pole piece 31 and the second pole piece 32 to be transported to the winding mechanism 117.

[0139] That is, the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 are driven by the second driving mechanism 115 and then conveyed to the winding mechanism 117 .

[0140] Since the size of the pole piece slitting system 101 is relatively large and the distance between the second cutting mechanism 111 and the winding mechanism 117 is relatively far, a second driving mechanism 115 is provided to provide a certain driving force during the transmission of the first pole piece 31 and the second pole piece 32 so that the first pole piece 31 and the second pole piece 32 maintain a certain tension. In this way, the alignment of the end faces of the first pole piece 31 and the second pole piece 32 wound by the winding mechanism 117 can be guaranteed to a certain extent, and no barrel material is generated.

[0141] The second driving mechanism 115 can be any mechanism known to those skilled in the art for driving the transmission of the material belt 29 .

[0142] The number of the winding mechanisms 117 is at least two, and the two winding mechanisms 117 are respectively arranged corresponding to the first pole piece 31 and the second pole piece 32 to respectively wind up the first pole piece 31 and the second pole piece 32 .

[0143] In the above technical solution, the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 are kept at a certain tension through the second driving mechanism 115, which is conducive to improving the flatness of the first pole piece 31 and the second pole piece 32 rolled up by the winding mechanism 117. In addition, the second driving mechanism 115 can cooperate with the first driving mechanism 114 to achieve that the material strip 29 maintains a certain tension during the entire transmission process, which is conducive to further controlling the position of the first cutting mechanism 110 cutting the material strip 29 and controlling the position of the second cutting mechanism 111 cutting the material strip 29 to meet expectations.

[0144] According to some embodiments of the present application, the second driving mechanism 115 includes: two second mounting structures; two second driving rollers, which are rotatably mounted on the two second mounting structures respectively; two second pressing rollers, which are rotatably mounted on the two second mounting structures respectively, and are arranged opposite to the second driving rollers on the second mounting structures where they are located, so as to define a second pressing gap with the second driving rollers, and the second driving rollers are used to rotate to drive the first pole piece 31 and the second pole piece 32 to be respectively conveyed to the winding mechanism 117 through the corresponding second pressing gaps.

[0145] That is, a second driving roller and a second pressing roller are disposed on a second mounting structure, the second driving roller and the second pressing roller are disposed opposite to each other to define a second pressing gap, and two second pressing gaps are defined on the two second mounting structures respectively.

[0146] The two second installation structures can be arranged up and down, thus saving the lateral space of the pole piece cutting system 101 and reducing the occupied area.

[0147] The following description will be made by taking the second driving roller and the second pressing roller installed on a second installation structure as an example.

[0148] The second driving roller may include a second roller body and a second roller neck, and the second roller necks are arranged at both ends of the second roller body along the extension direction of the second roller body. The second roller neck is also provided with a bearing, the inner ring of the bearing is sleeved on the outer circumference of the second roller neck, and the outer ring can be installed on the second mounting mechanism, so that when the inner ring rotates compared to the outer ring, the second driving roller is rotated compared to the second mounting structure.

[0149] In some embodiments, the second driving mechanism 115 may further include a second driving motor, and the second driving motor is used to drive the bearing to rotate, so as to drive the second driving roller to rotate.

[0150] The second roller body is arranged opposite to the second pressing roller, and the gap between the second roller body and the second pressing roller forms a second pressing gap. The end of the second pressing roller can also be installed on the second mounting structure through a bearing, so that the second pressing roller can rotate relative to the second mounting structure.

[0151] The gap width of the second nip is configured so that the material web 29 is in contact with both the second drive roller and the second nip roller.

[0152] In the above technical scheme, through the second pressing gap, the conveying direction of the pole piece 30 can be limited while driving the pole piece 30 to be conveyed, so that the conveying direction of the pole piece 30 of the material strip 29 is in line with expectations, which is beneficial to improving the flatness of the winding mechanism 117 for the first pole piece 31 and the second pole piece 32, as well as controlling the position of the first cutting mechanism 110 cutting the material strip 29 and controlling the position of the second cutting mechanism 111 cutting the material strip 29 to be in line with expectations.

[0153] refer to Figure 6 According to some embodiments of the present application, the pole piece slitting system 101 further includes: a tension adjustment mechanism for adjusting the tension of the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 and then transmitting them to the second driving mechanism 115 .

[0154] The first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 pass through the tension adjusting mechanism, and the tension adjusting mechanism is used to adjust the tension of the first pole piece 31 and the second pole piece 32 to avoid excessive or insufficient tension of the first pole piece 31 and the second pole piece 32, thereby greatly reducing the first pole piece 31 and the second pole piece 32 from breaking due to excessive tension, or the problem of low end face alignment of the first pole piece 31 and the second pole piece 32 when rolled up by the winding mechanism 117 or even producing barrel material due to insufficient tension.

[0155] It can be understood that the tension adjustment mechanism is arranged after the first driving mechanism 114 and before the second driving mechanism 115 to adjust the tension of the first pole piece 31 and the second pole piece 32 transmitted between the first driving mechanism 114 and the second driving mechanism 115, thereby reducing the difficulty of the first driving mechanism 114 and the second driving mechanism 115 to synchronously drive the first pole piece 31 and the second pole piece 32.

[0156] The tension adjustment mechanism can be any mechanism known to those skilled in the art that can adjust and control the tension.

[0157] In the above technical scheme, it is possible to avoid, to a certain extent, the problem that the tension of the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 is too small, resulting in poor effect of the second driving mechanism 115 driving the first pole piece 31 and the second pole piece 32. It is also possible to avoid, to a certain extent, the problem of belt breakage in the process of the second driving mechanism 115 driving the first pole piece 31 and the second pole piece 32 due to the tension of the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 is too large, thereby maintaining the balance of tension between the first driving mechanism 114 and the second driving mechanism 115.

[0158] refer to Figure 8 According to some embodiments of the present application, the tension adjustment mechanism includes: two tension adjustment components 1161, the two tension adjustment components 1161 are respectively used to adjust the tension of the first pole piece 31 and the second pole piece 32, and the tension adjustment component 1161 includes: a third mounting structure (not shown); at least one tension adjustment roller 41, the tension adjustment roller 41 is used to convey the first pole piece 31 or the second pole piece 32; a mounting portion 42, the mounting portion 42 is movably mounted on the third mounting structure along a first direction X, and the tension adjustment roller 41 is rotatably mounted on the mounting portion 42, and the first direction X is perpendicular to the extension direction of the tension adjustment roller 41; a tension adjustment controller 43, which is used to control the mounting portion 42 to move along the first direction X to drive the tension adjustment roller 41 to move along the first direction X, thereby adjusting the distance between the tension adjustment roller 41 and the second driving mechanism 115.

[0159] The two tension adjustment components 1161 can be arranged up and down to save the horizontal space of the pole piece cutting system 101 and reduce the occupied area.

[0160] The tension adjustment roller 41 is more rotatable than the mounting portion 42, so the first pole piece 31 or the second pole piece 32 is transmitted to the second driving mechanism 115 via the tension adjustment roller 41. In some embodiments, both ends of the tension adjustment roller 41 can be mounted on the mounting portion 42 via bearings.

[0161] The mounting portion 42 is movably mounted on the third mounting structure along the first direction X, so that when the mounting portion 42 moves along the first direction X, the tension adjustment roller 41 can be driven to move along the first direction X, thereby adjusting the tension of the first pole piece 31 or the second pole piece 32 transmitted by the tension adjustment roller 41. The movement of the mounting portion 42 along the first direction X here means that the mounting portion 42 can move back and forth along the first direction X.

[0162] Exemplarily, the tension adjustment controller 43 can control the first pole piece 31 or the second pole piece 32 to move in the direction close to the second drive mechanism 115 in the first direction X, or can control the first pole piece 31 or the second pole piece 32 to move in the direction away from the second drive mechanism 115 in the first direction X. In this way, when the tension of the first pole piece 31 or the second pole piece 32 is too large, the tension of the first pole piece 31 or the second pole piece 32 transmitted between the tension adjustment roller 41 and the second drive mechanism 115 is too large. Based on this, the distance between the tension adjustment roller 41 and the second drive mechanism 115 can be reduced to reduce the tension of the first pole piece 31 or the second pole piece 32. On the contrary, when the first pole piece 31 or the second pole piece 32 transmitted between the tension adjustment roller 41 and the second drive mechanism 115 is too loose, the distance between the tension adjustment roller 41 and the second drive mechanism 115 can be increased to tighten the first pole piece 31 or the second pole piece 32.

[0163] The extension direction of the tension adjustment roller 41 may be the width direction of the first pole piece 31 or the second pole piece 32 transmitted through the tension adjustment roller 41 , and the transmission direction of the first pole piece 31 and the second pole piece 32 may be perpendicular to the extension direction of the tension adjustment roller 41 .

[0164] In some embodiments, there are multiple tension adjustment rollers 41 , which are arranged in parallel. The first pole piece 31 or the second pole piece 32 passes around the multiple tension adjustment rollers 41 to be transmitted to the second driving mechanism 115 .

[0165] In some embodiments, the mounting portion 42 can be mounted on the third mounting structure through a sliding assembly. The sliding assembly can include a slide rail 44 and a slider 45, and the slider 45 can move relative to the slide rail 44. The slide rail 44 extends along the first direction X and is mounted on the mounting portion 42, and the slider 45 can be mounted on the third mounting structure. The tension adjustment controller 43 drives the mounting portion 42 to move so that the mounting portion 42 moves relative to the slider 45 in the first direction X, thereby realizing the movement of the mounting portion 42 in the first direction X relative to the third mounting structure.

[0166] In some embodiments, the tension adjustment controller 43 may include but is not limited to a structure such as a pneumatic cylinder or an electric cylinder that can drive the mounting portion 42 to move.

[0167] In the above technical solution, by driving the tension adjustment roller 41 to move along the first direction X, the tension of the first pole piece 31 and the second pole piece 32 transported between the second cutting mechanism 111 and the second driving mechanism 115 can be adjusted, thereby realizing the adjustment of the tension of the first pole piece 31 and the second pole piece 32.

[0168] refer to Figure 6 According to some embodiments of the present application, the unwinding mechanism 113 includes: a first unwinding structure 1131 and a second unwinding structure 1132 arranged at intervals, and the first unwinding structure 1131 and the second unwinding structure 1132 are both used to load the material tape 29; an unwinding and reel-changing structure 1133, used to reel the material tape 29 loaded on the first unwinding structure 1131 and the second unwinding structure 1132, so that one of the first unwinding structure 1131 and the second unwinding structure 1132 unwinds the material tape 29 to the first cutting mechanism 110.

[0169] The first unwinding structure 1131 and the second unwinding structure 1132 can be arranged in an upper and lower interval to fully utilize the height space of the workshop, reduce the lateral size of the electrode slitting system 101, reduce the floor space, and reduce the construction cost of the factory building.

[0170] The structures of the first unwinding structure 1131 and the second unwinding structure 1132 may be the same. For example, both may include an unwinding roller, on which the material strip 29 is wound. The material strip 29 is unwound by controlling the rotation of the unwinding roller.

[0171] The unwinding and reel-changing structure 1133 is used to bond the starting end of the material tape 29 wound by the second unwinding structure 1132 to the end of the material tape 29 wound by the first unwinding structure 1131, or to bond the starting end of the material tape 29 wound by the first unwinding structure 1131 to the end of the material tape 29 wound by the second unwinding structure 1132, so that the material tape 29 can be put into production continuously and uninterruptedly. The unwinding and reel-changing structure 1133 may include an unwinding belt pressing structure, and the belt pressing structure can be used to press or bond the material tape 29 to achieve pressing and bonding of the material tape 29.

[0172] In the above technical solution, the unwinding mechanism 113 is used in a backup mode, which helps to shorten the waiting time for loading of the unwinding mechanism 113 and improve the efficiency of the electrode slitting system 101 in slitting the electrode 30 .

[0173] Continue to refer Figure 6According to some embodiments of the present application, the winding mechanism 117 includes a first winding component 1171 and a second winding component 1172; wherein the first winding component 1171 includes: a first winding structure 51 and a second winding structure 52 arranged at intervals, both of which are used to wind up the first pole piece 31, and a first winding and changing structure 53, used to control one of the first winding structure 51 and the second winding structure 52 to wind up the first pole piece 31; the second winding component 1172 includes: a third winding structure 61 and a fourth winding structure 62 arranged at intervals, both of which are used to wind up the second pole piece 32, and a second winding and changing structure 63, used to control one of the third winding structure 61 and the fourth winding structure 62 to wind up the second pole piece 32.

[0174] The first winding assembly 1171 and the second winding assembly 1172 can be arranged at intervals on the left and right to fully utilize the height space of the workshop, reduce the lateral size of the electrode slitting system 101, reduce the floor space, and reduce the construction cost of the factory building.

[0175] The first winding structure 51 and the second winding structure 52 may be arranged at intervals on the left and right, and the third winding structure 61 and the fourth winding structure 62 may be arranged at intervals on the left and right.

[0176] The first winding structure 51 and the second winding structure 52 may have the same structure, and the third winding structure 61 and the fourth winding structure 62 may have the same structure. Exemplarily, both may include a winding roller, and the first pole piece 31 and the second pole piece 32 may be wound by controlling the winding roller to rotate.

[0177] The first winding and rewinding structure 53 is used to cut off the end of the first pole piece 31 on one of the first winding structure 51 and the second winding structure 52 and bond it to the starting end of the first pole piece 31 on the other of the first winding structure 51 and the second winding structure 52 .

[0178] The second winding and rewinding structure 63 is used to cut off the end of the second pole piece 32 on one of the third winding structure 61 and the fourth winding structure 62 and bond it to the starting end of the second pole piece 32 on the other of the third winding structure 61 and the fourth winding structure 62 .

[0179] The first winding and rewinding structure 53 and the second winding and rewinding structure 63 may both include a winding cutter and a winding and pressing structure. The winding cutter is used to cut the first pole piece 31 or the second pole piece 32 , and the winding and pressing structure is used to press or bond the first pole piece 31 / the second pole piece 32 to achieve tape change.

[0180] In the above technical solution, the winding mechanism 117 is used in a backup mode, which helps to shorten the material rewinding time of the winding mechanism 117 and improve the efficiency of the electrode slitting system 101 in slitting the electrode 30 .

[0181] An embodiment of the present application provides a battery production device, which includes the electrode cutting system 101 in the above embodiment.

[0182] The battery production equipment can be used for producing batteries. For example, it can be used for winding the first pole sheet and the second pole sheet to form a wound battery cell, or it can be used for stacking the first pole sheet and the second pole sheet to form a stacked battery cell.

[0183] refer to Figures 6 to 8 The embodiment of the present application provides a pole piece cutting system 101, including: a first cutting mechanism 110, used to cut the material strip 29 input to the pole piece cutting system 101 to form a pole piece 30 and convey the pole piece 30, the pole piece 30 includes pole ears on both sides; a second cutting mechanism 111, used to receive the pole piece 30 conveyed by the first cutting mechanism 110, and cut the pole piece 30 into a first pole piece 31 and a second pole piece 32, the first pole piece 31 and the second pole piece 32 both include a pole ear on one side; a correction mechanism 112, used to obtain an image of the first pole piece 31 and the second pole piece 32, and based on the image, correct the position of the first cutting mechanism 110 cutting the material strip 29 and / or correct the position of the second cutting mechanism 111 cutting the pole piece 30, so that the width dimensions of the first pole piece 31 and the second pole piece 32 formed after the correction are consistent.

[0184] The first cutting mechanism 110 includes a laser cutting device, and the second cutting mechanism 111 includes a slitting mechanism.

[0185] The correcting mechanism 112 includes: a visual inspection device 1121, which is arranged on the side of the second cutting mechanism 111 away from the first cutting mechanism 110, and is used to obtain images of the first pole piece 31 and the second pole piece 32; a correcting device 1122, which is used to transmit the material strip 29 input to the pole piece cutting system 101 to the first cutting mechanism 110; a controller is used to control the position of the laser light path emitted by the laser cutting device to correct the position of the cut material strip 29, and the controller is also used to control the correcting device 1122 to adjust the transmission direction of the material strip 29 to correct the position of the pole piece 30 cut by the second cutting mechanism 111.

[0186] The deflection correction device 1122 includes: a deflection correction roller for conveying the material belt 29; two sensors, which are arranged on the same side of the first portion 301 of the material belt 29 and are respectively used to detect the positions of the first edges of the two marking layers 303 close to each other; and a controller for controlling the rotation of the deflection correction roller based on the image and the position of the first edge detected by the sensor to adjust the conveying direction of the material belt 29. The visual detection device 1121 includes a macro camera.

[0187] The first driving mechanism 114 includes: a first mounting structure 1141; a first driving roller 1142, rotatably mounted on the first mounting structure 1141; a first pressing roller 1143, rotatably mounted on the first mounting structure 1141 and arranged opposite to the first driving roller 1142 to define a first pressing gap with the first driving roller 1142, the unwinding mechanism 113 is used to convey the material strip 29 to the first pressing gap, and the first driving roller 1142 is used to rotate to drive the material strip 29 to be conveyed to the first cutting mechanism 110 through the first pressing gap.

[0188] The electrode slitting system 101 also includes: an unwinding mechanism 113, which is arranged on the side of the first cutting mechanism 110 away from the second cutting mechanism 111, and is used to unwind the material strip 29 input into the electrode slitting system 101 to convey it to the first cutting mechanism 110; a first driving mechanism 114, which is used to drive the material strip 29 unwound by the unwinding mechanism 113 to be conveyed to the first cutting mechanism 110; and a winding mechanism 117, which is arranged on the side of the second cutting mechanism 111 away from the first cutting mechanism 110, and is used to wind up the first electrode 31 and the second electrode 32.

[0189] The pole piece slitting system 101 further includes: a second driving mechanism 115, which is disposed between the second cutting mechanism 111 and the winding mechanism 117, and the second driving mechanism 115 is used to drive the first pole piece 31 and the second pole piece 32 to be transported to the winding mechanism 117. Thus, the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 maintain a certain tension, which is conducive to improving the flatness of the winding of the first pole piece 31 and the second pole piece 32 by the winding mechanism 117.

[0190] The second driving mechanism 115 includes: two second mounting structures; two second driving rollers, which are rotatably mounted on the second mounting structures respectively; two second pressing rollers, which are rotatably mounted on the second mounting structures respectively, and are arranged opposite to the second driving rollers on the second mounting structures where they are located, so as to define a second pressing gap with the second driving rollers, and the first pole piece 31 and the second pole piece 32 are respectively conveyed to the two second pressing gaps, and the two second driving rollers are used to rotate to drive the first pole piece 31 and the second pole piece 32 to be conveyed to the winding mechanism 117 through the corresponding second pressing gaps.

[0191] The pole piece slitting system 101 further includes: a tension adjustment mechanism, which is used to adjust the tension of the first pole piece 31 and the second pole piece 32 output by the second cutting mechanism 111 and then transport them to the second driving mechanism 115. The tension adjustment mechanism includes: two tension adjustment components 1161, which are used to adjust the tension of the first pole piece 31 and the second pole piece 32 respectively, and the tension adjustment components 1161 include: a third mounting structure; at least one tension adjustment roller 41, which is used to transport the first pole piece 31 or the second pole piece 32; a mounting portion 42, which is movably mounted on the third mounting structure along a first direction X, and the tension adjustment roller 41 is rotatably mounted on the mounting portion 42, and the first direction X is perpendicular to the extension direction of the tension adjustment roller 41; a tension adjustment controller 43, which is used to control the mounting portion 42 to move along the first direction X to drive the tension adjustment roller 41 to move along the first direction X, thereby adjusting the distance between the tension adjustment roller 41 and the second driving mechanism 115.

[0192] The unwinding mechanism 113 includes: a first unwinding structure 1131 and a second unwinding structure 1132 arranged at intervals, both of which are used to load the material tape 29; an unwinding and reel-changing structure 1133, which is used to reel the material tape 29 loaded on the first unwinding structure 1131 and the second unwinding structure 1132, so that one of the first unwinding structure 1131 and the second unwinding structure 1132 unwinds the material tape 29 to the first cutting mechanism 110.

[0193] The winding mechanism 117 includes a first winding component 1171 and a second winding component 1172; wherein the first winding component 1171 includes: a first winding structure 51 and a second winding structure 52 arranged at intervals, both of which are used to wind up the first pole piece 31, and a first winding and changing structure 53, used to control one of the first winding structure 51 and the second winding structure 52 to wind up the first pole piece 31; the second winding component 1172 includes: a third winding structure 61 and a fourth winding structure 62 arranged at intervals, both of which are used to wind up the second pole piece 32, and a second winding and changing structure 63, used to control one of the third winding structure 61 and the fourth winding structure 62 to wind up the second pole piece 32.

[0194] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pole piece cutting system, characterized in that: include: A first cutting mechanism, used for cutting the material strip input to the pole piece cutting system to form pole pieces and conveying the pole pieces, wherein the pole pieces include pole ears on both sides; A second cutting mechanism, used for receiving the electrode sheet conveyed by the first cutting mechanism, and cutting the electrode sheet into a first electrode sheet and a second electrode sheet, wherein the first electrode sheet and the second electrode sheet both include an electrode ear located on one side; A correction mechanism is used to obtain images of the first pole piece and the second pole piece, and based on the images, correct the position of the first cutting mechanism cutting the material strip and / or correct the position of the second cutting mechanism cutting the pole piece, so that the width dimensions of the first pole piece and the second pole piece formed after the correction are consistent.

2. The pole piece cutting system according to claim 1, characterized in that: The material strip comprises a first portion and second portions located on opposite sides of the first portion, and an identification layer is provided at an edge of the first portion close to the second portion; The first cutting mechanism is used to cut the second portion to form the pole ear; The second cutting mechanism is used to cut the electrode piece along the midline of the first part to form the first electrode piece and the second electrode piece, and the portion of the first part other than the identification layer is used to form the main body of the first electrode piece and the second electrode piece respectively, and the electrode ear is located on one side of the main body; The correction mechanism is used to obtain the first width of the identification layer in the first pole piece and the second pole piece respectively based on the image, and correct the position of the first cutting mechanism cutting the material strip based on the difference between the two first widths. It is also used to obtain the second widths of the main parts in the first pole piece and the second pole piece respectively based on the image, and to correct the position of the second cutting mechanism cutting the pole piece based on the difference between the two second widths.

3. The pole piece cutting system according to claim 2, characterized in that: The deviation correction mechanism comprises: A visual inspection device, disposed on a side of the second cutting mechanism away from the first cutting mechanism, and used to obtain images of the first pole piece and the second pole piece; A deviation correction device, used for transmitting the material strip input to the pole piece slitting system to the first cutting mechanism; A controller, configured to receive the image; The controller is also used to control the correction device to adjust the transmission direction of the material strip based on the image.

4. The pole piece cutting system according to claim 3, characterized in that: The deviation correcting device comprises: A deviation correction roller, used for conveying the material strip; a sensor, the sensor being disposed corresponding to the first portion of the material strip and configured to detect a position of the marking layer away from a first edge of the second portion; The controller is used to control the rotation of the deviation correction roller based on the image and the position of the first edge detected by the sensor to adjust the transmission direction of the material strip.

5. The pole piece cutting system according to claim 3, characterized in that: The first cutting mechanism includes a laser cutting device, and the laser cutting device is used to cut the material strip by laser. The controller is used to control the position of the laser light path emitted by the laser cutting device to correct the position of cutting the material strip, and the controller is also used to control the correction device to adjust the transmission direction of the material strip to correct the position of the second cutting mechanism cutting the pole piece.

6. The pole piece cutting system according to claim 3, characterized in that: The visual inspection device includes a macro camera.

7. The pole piece cutting system according to any one of claims 1 to 6, characterized in that: The pole piece cutting system also includes: An unwinding mechanism, arranged on a side of the first cutting mechanism away from the second cutting mechanism, for unwinding the material tape input to the pole piece slitting system to transport it to the first cutting mechanism; A first driving mechanism, used for driving the material strip unwound by the unwinding mechanism to be transported to the first cutting mechanism; The winding mechanism is arranged on a side of the second cutting mechanism away from the first cutting mechanism, and is used for winding the first pole piece and the second pole piece.

8. The pole piece cutting system according to claim 7, characterized in that: The first driving mechanism comprises: a first mounting structure; A first driving roller, rotatably mounted on the first mounting structure; The first pressing roller is rotatably mounted on the first mounting structure and is arranged opposite to the first driving roller to define a first pressing gap with the first driving roller. The unwinding mechanism is used to convey the material strip to the first pressing gap. The first driving roller is used to rotate to drive the material strip to be conveyed to the first cutting mechanism through the first pressing gap.

9. The pole piece cutting system according to claim 7, characterized in that: The pole piece cutting system also includes: The second driving mechanism is arranged between the second cutting mechanism and the winding mechanism, and the second driving mechanism is used for driving the first pole piece and the second pole piece to be transported to the winding mechanism.

10. The pole piece cutting system according to claim 9, characterized in that: The second driving mechanism comprises: two second mounting structures; Two second driving rollers are rotatably mounted on the two second mounting structures respectively; Two second pressing rollers are rotatably mounted on the two second mounting structures respectively, and are arranged opposite to the second driving roller on the second mounting structure on which they are located to define a second pressing gap with the second driving roller, and the second driving roller is used to rotate to drive the first pole piece and the second pole piece to be transported to the winding mechanism through the corresponding second pressing gap respectively.

11. The pole piece cutting system according to claim 9, characterized in that: The pole piece cutting system also includes: The tension adjustment mechanism is used to adjust the tension of the first pole piece and the second pole piece output by the second cutting mechanism and then transmit them to the second driving mechanism.

12. The pole piece cutting system according to claim 11, characterized in that: The tension adjustment mechanism includes: two tension adjustment components, the two tension adjustment components are used to adjust the tension of the first pole piece and the second pole piece respectively, and the tension adjustment components include: A third mounting structure; at least one tension adjustment roller, the tension adjustment roller being used to convey the first pole piece or the second pole piece; a mounting portion, the mounting portion being movably mounted on the third mounting structure along a first direction, and both ends of the tension adjustment roller being rotatably mounted on the mounting portion, wherein the first direction is perpendicular to an extending direction of the tension adjustment roller; The tension adjustment controller is used to control the installation portion to move along the first direction to drive the tension adjustment roller to move along the first direction, thereby adjusting the distance between the tension adjustment roller and the second driving mechanism.

13. The pole piece cutting system according to claim 7, characterized in that: The unwinding mechanism comprises: A first unwinding structure and a second unwinding structure are arranged at intervals, and the first unwinding structure and the second unwinding structure are both used for loading the material tape; The unwinding and rewinding structure is used to rewind the material tape loaded by the first unwinding structure and the second unwinding structure, so that one of the first unwinding structure and the second unwinding structure unwinds the material tape to the first cutting mechanism.

14. The pole piece cutting system according to claim 7, characterized in that: The winding mechanism comprises a first winding assembly and a second winding assembly; wherein, The first winding assembly comprises: a first winding structure and a second winding structure arranged at intervals, wherein the first winding structure and the second winding structure are both used to wind up the first pole piece, and a first winding and changing structure, used for controlling one of the first winding structure and the second winding structure to wind up the first pole piece; The second winding assembly comprises: a third winding structure and a fourth winding structure arranged at intervals, wherein the third winding structure and the fourth winding structure are both used to wind up the second pole piece, and The second winding and changing structure is used to control one of the third winding structure and the fourth winding structure to wind up the second pole piece.

15. A battery production device, characterized in that: Comprising a pole piece cutting system as described in any one of claims 1-14.

Images