Apparatus and method for manufacturing electrode plate of battery cell

Abstract

An apparatus and a method for manufacturing an electrode plate of a battery cell. The apparatus comprises: a tab die-cutting unit; a first visual detection unit for a first surface side of the electrode plate; an electrode plate cutting unit; a second visual detection unit for a second surface side of the electrode plate opposite to the first surface side; a first deviation rectification unit located upstream of the electrode plate cutting unit; and a second deviation rectification unit located downstream of the electrode plate cutting unit.

Description

Device and method for manufacturing electrode sheets for battery cells

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410312214.6 filed on March 19, 2024, entitled “Device and method for manufacturing electrode sheets for battery cells” and priority to Chinese patent application No. 202311678823.5 filed on December 8, 2023, entitled “Device and method for manufacturing positive electrode sheets for battery cells”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a device and method for manufacturing electrode sheets for battery cells. Background Art

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

[0005] Electrode sheets are an essential component of battery cells. They include positive and negative electrodes. Minimizing electrode sheet manufacturing errors helps improve battery cell quality.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides an apparatus and method for manufacturing electrode sheets for battery cells.

[0008] In a first aspect, the present disclosure provides a device for manufacturing electrode sheets for battery cells, characterized in that the device comprises: an incoming material traction mechanism for guiding the incoming electrode sheet to move from upstream to downstream in a processing direction, the incoming electrode sheet having a first edge and a second edge in a width direction perpendicular to the direction of movement of the incoming electrode sheet; wherein the device is further arranged in sequence from upstream to downstream in accordance with the direction of movement of the incoming electrode sheet: a first deviation correction mechanism for adjusting the position of the incoming electrode sheet relative to the tab cutting portion of the die-cutting mechanism in the width direction; the die-cutting mechanism including a tab cutting portion for cutting the tab on the incoming electrode sheet; a first visual inspection mechanism for Acquire a first image of the first surface of the incoming electrode sheet after the tab is cut; a second correcting mechanism is used to adjust the position of the incoming electrode sheet relative to the slitting and cutting portion of the slitting mechanism in the width direction; the slitting mechanism includes a slitting and cutting portion for cutting the incoming electrode sheet into a first electrode sheet and a second electrode sheet, the first electrode sheet includes the first edge, and the second electrode sheet includes the second edge; a second visual detection mechanism is used to acquire a second image of the second surface of the first electrode sheet and the second electrode sheet opposite to the first surface; and a control unit is used to control the first correcting mechanism and the second correcting mechanism according to the first image and the second image.

[0009] In a second aspect, the present disclosure provides a method for manufacturing electrode sheets for battery cells, characterized in that the method includes: cutting out a first tab and a second tab at a first edge and a second edge opposite to each other in a width direction perpendicular to a movement direction of an electrode sheet material; obtaining a first image of a first surface of the electrode sheet material after the tab cutting is completed to determine a first set of dimensional parameters; cutting the electrode sheet material into a first electrode sheet including a first edge and a second electrode sheet including a second edge along a width direction of the electrode sheet material after the tab cutting is completed; obtaining a second image of the second surfaces of the first electrode sheet and the second electrode sheet to determine a second set of dimensional parameters, the second surface being opposite to the first surface; adjusting the cutting position of the first tab and the second tab according to the first set of dimensional parameters and the second set of dimensional parameters; and adjusting the cutting position of the first electrode sheet and the second electrode sheet according to the first set of dimensional parameters and the second set of dimensional parameters.

[0010] The present application adjusts the tab cutting position and the electrode sheet slitting position through closed-loop feedback control, thereby reducing the manufacturing error of the electrode sheet and improving the quality of the battery cell.

[0011] 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

[0012] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0013] FIG1 is a top view of an apparatus for manufacturing an electrode sheet according to some embodiments of the present application;

[0014] FIG2 is a schematic diagram of processing of electrode sheet materials according to some embodiments of the present application;

[0015] FIG3 is a schematic diagram of processing of electrode sheets according to other embodiments of the present application;

[0016] FIG4 is a schematic flow chart of a method for manufacturing an electrode sheet according to some embodiments of the present application;

[0017] FIG5 is a schematic structural diagram of an apparatus for manufacturing electrode sheets according to some embodiments of the present application. DETAILED DESCRIPTION

[0018] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0020] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0021] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0023] Please refer to FIG. 1 , which is a top view of an apparatus for manufacturing electrode sheets according to some embodiments of the present application.

[0024] According to some embodiments, the incoming electrode sheet material moves from upstream to downstream in the processing direction under the traction force of an incoming material traction mechanism (not shown). The incoming material traction mechanism guides the incoming electrode sheet material to move from upstream to downstream in the processing direction. The incoming electrode sheet material has a first edge and a second edge in a width direction perpendicular to the direction of movement of the incoming electrode sheet material.

[0025] According to some embodiments, the device for manufacturing electrode sheets is also arranged in sequence from upstream to downstream according to the movement direction of the electrode sheet material: a first correcting mechanism 102, a die-cutting mechanism 103, a first visual inspection mechanism 104, a second correcting mechanism 105, a slitting mechanism 106, a second visual inspection mechanism 107 and a control unit (not shown).

[0026] The incoming material traction mechanism includes multiple upper and lower roller pairs driven by motors from upstream to downstream, so that the incoming electrode sheet moves from upstream to downstream according to the processing direction.

[0027] The first deviation-correcting mechanism 102 adjusts the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism in a width direction perpendicular to the moving direction of the electrode sheet material.

[0028] The die-cutting mechanism 103 includes a tab cutting portion for cutting tabs from incoming electrode sheets.

[0029] The position of the tab cutting portion of the die-cutting mechanism 103 is fixed. The first deflection-correcting mechanism 102 adjusts the position of the incoming electrode material relative to the tab cutting portion of the die-cutting mechanism. According to ideal design values, the position of the incoming electrode material relative to the tab cutting portion of the die-cutting mechanism adjusted by the first deflection-correcting mechanism 102 ensures that the dimensions of the first and second tabs obtained after cutting are consistent.

[0030] The first visual inspection mechanism 104 obtains a first image of a first surface of the incoming electrode sheet after the tabs are cut.

[0031] The second deviation-correcting mechanism 105 adjusts the position of the incoming electrode sheet relative to the slitting and cutting portion of the slitting mechanism in a width direction perpendicular to the moving direction of the incoming electrode sheet.

[0032] The slitting mechanism 106 includes a slitting and cutting portion for slitting the incoming electrode sheet into a first electrode sheet and a second electrode sheet.

[0033] The second visual inspection mechanism 107 obtains a second image of a second surface of the first electrode sheet and the second electrode sheet, which is opposite to the first surface.

[0034] The control unit (not shown) controls the first deflection correcting mechanism 102 and the second deflection correcting mechanism 105 according to the first image and the second image.

[0035] As shown in Figure 1, the device for manufacturing electrode sheets is also arranged with multiple roller assemblies 101 from upstream to downstream according to the movement direction of the electrode sheet material. The contact surface between the roller assembly 101 and the electrode sheet material can be a curved surface, and in the working state, the roller assembly 101 can rotate from upstream to downstream to drive the electrode sheet material to move smoothly from upstream to downstream according to the processing direction without bending or falling, which will affect the processing.

[0036] According to some embodiments, a host computer (industrial computer) serves as the control unit.

[0037] According to some embodiments, the control unit calculates various dimensional parameters, such as the size of the active material area, the size of the insulating material area, or the size of the tab of an electrode sheet (e.g., a positive electrode sheet), based on the images captured by the first visual inspection mechanism 104 and the second visual inspection mechanism 107. Based on these dimensional parameters, the control unit calculates the correction amount for the first correcting mechanism 102 and the correction amount for the second correcting mechanism 105. Furthermore, the control unit sends the correction amount to the first correcting mechanism 102 and the second correcting mechanism 105, respectively.

[0038] According to some embodiments, the control unit is configured to control the first deflection correction mechanism through closed-loop feedback based on the first image and the second image to minimize the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet.

[0039] According to some embodiments, the control unit is configured to control the second deflection correction mechanism through closed-loop feedback based on the first image and the second image to minimize the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet.

[0040] According to some embodiments, the control unit is configured to determine a first deflection correction amount based on a difference between the insulating material region of the first electrode sheet and the insulating material region of the second electrode sheet. The first deflection correction mechanism adjusts the position of the incoming electrode sheet relative to the tab cutting portion of the die-cutting mechanism using the first deflection correction amount.

[0041] According to some embodiments, the control unit is configured to determine a second deflection correction amount based on a difference between the active material region of the first electrode sheet and the active material region of the second electrode sheet. The second deflection correction mechanism adjusts a position of the incoming electrode sheet relative to the slitting portion of the slitting mechanism using the second deflection correction amount.

[0042] According to some embodiments, the control unit calculates various dimensional parameters, such as the size of the active material area of ​​the electrode sheet (e.g., the negative electrode sheet), the size of the area where the tab overlaps with the active material area (i.e., the portion of the tab covered with the active material, hereinafter referred to as the step area), or the size of the tab, based on the images captured by the first visual inspection mechanism 104 and the second visual inspection mechanism 107. Based on the various dimensional parameters, the control unit calculates the correction amount of the first correcting mechanism 102 and the correction amount of the second correcting mechanism 105. Furthermore, the control unit sends the correction amount to the first correcting mechanism 102 and the second correcting mechanism 105, respectively.

[0043] According to some embodiments, the control unit is configured to control the first deflection correction mechanism through closed-loop feedback based on the first image and the second image to minimize the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet.

[0044] According to some embodiments, the control unit is configured to control the second deflection correction mechanism through closed-loop feedback based on the first image and the second image to minimize the difference between the extreme width dimensions of the first electrode sheet and the extreme width dimensions of the second electrode sheet.

[0045] According to some embodiments, the control unit is configured to determine a first deflection correction amount based on a difference between a step region of the first electrode sheet and a step region of the second electrode sheet. The first deflection correction mechanism adjusts a position of the incoming electrode sheet relative to the tab cutting portion of the die-cutting mechanism using the first deflection correction amount.

[0046] According to some embodiments, the control unit is configured to determine a second deflection correction amount based on a difference between the width of the first electrode sheet and the width of the second electrode sheet. The second deflection correction mechanism adjusts the position of the incoming electrode sheet relative to the slitting portion of the slitting mechanism using the second deflection correction amount.

[0047] Please refer to FIG. 2 , which is a schematic diagram of electrode sheet processing according to some embodiments of the present application.

[0048] According to some embodiments, for example, the first surface (e.g., surface A shown in FIG2 ) and the second surface (e.g., surface B shown in FIG2 ) of an electrode sheet material used to manufacture a positive electrode sheet include, from the first edge to the second edge, a first metal diaphragm region (e.g., the uppermost region in FIG2 ), a first insulating material region (e.g., the shaded region near the first edge in FIG2 ), an active material region (e.g., the shaded region in the middle of FIG2 ), a second insulating material region (e.g., the shaded region near the second edge in FIG2 ), and a second metal diaphragm region (e.g., the lowermost region in FIG2 ).

[0049] The tab cutting portion includes: a first cutting head for cutting a first tab (e.g., R1 shown in FIG2 ) in a first metal diaphragm region and a first insulating material region; and a second cutting head for cutting a second tab (e.g., R2 shown in FIG2 ) in a second metal diaphragm region and a second insulating material region.

[0050] The control unit determines, based on the first image and the second image, the distance K1 (the distance from AP1 to AP2) from the root of the first pole tab to the active material area on the first surface, the distance N1 (the distance from BP1 to BP2) from the root of the first pole tab to the active material area on the second surface, the distance K2 (the distance from AP5 to AP4) from the root of the second pole tab to the active material area on the first surface, and the distance N2 (the distance from BP5 to BP4) from the root of the second pole tab to the active material area on the second surface, and controls the first deviation correction mechanism to adjust the position of the electrode sheet relative to the first cutting head and the second cutting head in the width direction so that the difference between the sum of the distance K1 and the distance N1 and the sum of the distance K2 and the distance N2 is minimized.

[0051] According to some embodiments, the control unit determines, based on the first image and the second image, a width M3 of the active material area on the first surface of the first electrode sheet, a width M4 of the active material area on the first surface of the second electrode sheet, a width M1 of the active material area on the second surface of the first electrode sheet, and a width M2 of the active material area on the second surface of the second electrode sheet. Furthermore, the control unit controls the second deflection correction mechanism to adjust the position of the incoming electrode sheet relative to the slitting section in the width direction so that the difference between the sum of the width M3 and the width M1 and the sum of the width M4 and the width M2 is minimized.

[0052] According to some embodiments, the timing of the first visual detection mechanism acquiring the first image, the timing of the second visual detection mechanism acquiring the second image, and the movement speed of the electrode sheet material are set so that the detection point of the first visual detection mechanism and the detection point of the second visual detection mechanism correspond to two relative surfaces at the same position on the electrode sheet material.

[0053] According to some embodiments, active material and insulating material are coated on both surface sides (surface A and surface B) of a conductive metal foil (e.g., aluminum foil). The active material is coated on the middle area of ​​the metal foil. The active material participates in the electrochemical reaction within the battery, and coating the active material on as large an area as possible is beneficial to improving the power supply efficiency of the battery. Insulating material is coated on both sides of the active material area. The active material area is sometimes referred to as a membrane area. The portion of the insulating material area from the base of the tab to the boundary of the active material area is sometimes referred to as the AT area. According to some embodiments, the active material is black, which is significantly different from the color of the insulating material. For example, according to some embodiments, the insulating material contains white ceramic powder. In Figure 2, the central shaded area between AP2 and AP4 represents the active material area, the shaded areas on both sides of the active material area represent the insulating material area, and the tab areas of the electrode sheet before and after die-cutting are shown further outside the insulating material area.

[0054] As shown in Figure 2, the first electrode tab R1 and the second electrode tab R2 are shown at the upper and lower parts of the electrode sheet, and the cutting line for cutting the electrode sheet into the first electrode sheet and the second electrode sheet is shown in the middle of the width direction of the electrode sheet. Figure 2 (A) shows the first surface side of the electrode sheet (hereinafter referred to as the A surface side), and Figure 2 (B) shows the second surface side of the electrode sheet opposite to the first surface side (hereinafter referred to as the B surface side). The cutting line is shown as P3 in Figure 2 (B).

[0055] According to some embodiments, the incoming material pulling mechanism is realized by an upper and lower roller pair driven by a motor. The upper and lower roller pair driven by the motor clamps the electrode sheet, and the electrode sheet moves with the rotation of the upper and lower roller pair.

[0056] According to some embodiments, a die-cutting unit is used to cut out a first electrode tab R1 and a second electrode tab R2 at the upper and lower portions of the electrode sheet, respectively.

[0057] According to some embodiments, the electrode sheet is cut into the first electrode sheet and the second electrode sheet by a cutting unit at the middle position in the width direction of the electrode sheet.

[0058] Under ideal conditions with no manufacturing errors, various parameters of the first electrode sheet and the second electrode sheet are completely consistent. For example, the tab size, insulating film width, and active material film width of the first electrode sheet are completely consistent with the tab size, insulating film width, and active material film width of the second electrode sheet.

[0059] Under ideal conditions with no manufacturing errors, various parameters on the A-surface side of the electrode sheet and the B-surface side of the electrode sheet are completely consistent. For example, the tab size, insulating film width, and active material film width on the A-surface side of the electrode sheet are completely consistent with the tab size, insulating film width, and active material film width on the B-surface side of the electrode sheet.

[0060] However, in actual production, manufacturing errors are objectively unavoidable. The present invention dynamically adjusts the position of the electrode sheet in the width method through closed-loop feedback control to minimize the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet caused by manufacturing errors, and minimizes the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet.

[0061] Please refer to FIG. 3 , which is a schematic diagram of electrode sheet processing according to other embodiments of the present application.

[0062] According to some embodiments, for example, the first surface (e.g., surface A shown in FIG3 ) and the second surface (e.g., surface B shown in FIG3 ) of an electrode sheet material used to manufacture a negative electrode sheet include, from the first edge to the second edge, a first metal diaphragm region (e.g., the uppermost region in FIG3 ), an active material region (e.g., the middle hatched region in FIG3 ), and a second metal diaphragm region (e.g., the lowermost region in FIG3 ).

[0063] The tab cutting portion includes: a first cutting head for cutting a first tab (e.g., R1 shown in FIG3 ) in a first metal diaphragm region and an active material region; and a second cutting head for cutting a second tab (e.g., R2 shown in FIG3 ) in a second metal diaphragm region and an active material region.

[0064] The control unit determines a distance H from a first boundary of the active material region on the first surface to a root of the first electrode tab based on the first image and the second image. A1 (distance from AP1 to AP2), the distance H from the first boundary of the active material region on the second surface to the root of the first tab B1 (distance from BP1 to BP2), the distance H from the second boundary of the active material region on the first surface to the root of the second tab A2 (distance from AP4 to AP5) and the distance H from the second boundary of the active material region on the second surface to the root of the second tab B2 (distance from BP4 to BP5), and the control unit controls the first correction mechanism to adjust the position of the electrode sheet relative to the first cutting head and the second cutting head in the width direction so that the distance H A1 and distance H B1 The sum of the values ​​relative to the distance H A2 and distance H B2 Minimize the difference between the sum of .

[0065] According to some embodiments, the control unit determines, based on the second image, a width dimension M of the second surface of the first electrode sheet (the distance from the base BP2 of the first electrode tab to the slitting line BP3) and a width dimension N of the second surface of the second electrode sheet (the distance from the slitting line BP3 to the base BP4 of the second electrode tab). Furthermore, the control unit controls the second deflection correction mechanism to adjust the position of the incoming electrode sheet relative to the slitting section in the width direction so as to minimize the difference between the width M and the width N.

[0066] According to some embodiments, the timing of the first visual detection mechanism acquiring the first image, the timing of the second visual detection mechanism acquiring the second image, and the movement speed of the electrode sheet material are set so that the detection point of the first visual detection mechanism and the detection point of the second visual detection mechanism correspond to two relative surfaces at the same position on the electrode sheet material.

[0067] According to some embodiments, active material is coated on both surface sides (surface A and surface B) of a conductive metal foil (e.g., copper foil). The active material is coated on the middle area of ​​the metal foil. The active material participates in the electrochemical reaction within the battery, and coating the active material on an area as large as possible is beneficial to improving the power supply efficiency of the battery. The active material area is sometimes referred to as a membrane area. According to some embodiments, the active material appears black, which is significantly different from the color of the metal foil. In Figure 3, the central shaded area between AP2 and AP4 represents the active material area, and the central shaded area between BP2 and BP4 also represents the active material area. The tab areas of the electrode sheet before and after die-cutting are shown on both sides.

[0068] As shown in FIG3 , the first electrode tab R1 and the second electrode tab R2 are shown at the upper and lower parts of the electrode sheet, and the cutting line for cutting the electrode sheet into the first electrode sheet and the second electrode sheet is shown in the middle of the width direction of the electrode sheet. FIG3 (A) shows the first surface side of the electrode sheet (hereinafter referred to as the A surface side), and FIG3 (B) shows the second surface side of the electrode sheet opposite to the first surface side (hereinafter referred to as the B surface side). The cutting line is shown as BP3 in FIG3 (B).

[0069] According to some embodiments, the incoming material pulling mechanism is realized by an upper and lower roller pair driven by a motor. The upper and lower roller pair driven by the motor clamps the electrode sheet, and the electrode sheet moves with the rotation of the upper and lower roller pair.

[0070] According to some embodiments, a die-cutting unit is used to cut out a first electrode tab R1 and a second electrode tab R2 at the upper and lower portions of the electrode sheet, respectively.

[0071] According to some embodiments, the electrode sheet is cut into the first electrode sheet and the second electrode sheet by a cutting unit at the middle position in the width direction of the electrode sheet.

[0072] In an ideal situation without manufacturing errors, various parameters of the first electrode sheet and the second electrode sheet are completely consistent. For example, the tab size of the first electrode sheet and the width of the active material film, as well as the tab size of the second electrode sheet and the width of the active material film, are completely consistent.

[0073] Under ideal conditions with no manufacturing errors, various parameters on the A-surface side of the electrode sheet and the B-surface side of the electrode sheet are completely consistent. For example, the tab size and active material film width on the A-surface side of the electrode sheet are completely consistent with the tab size and active material film width on the B-surface side of the electrode sheet.

[0074] However, in actual production, manufacturing errors are objectively unavoidable. The present invention dynamically adjusts the position of the electrode sheet in the width direction through closed-loop feedback control to minimize the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet caused by manufacturing errors, and minimizes the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet.

[0075] Please refer to FIG. 4 , which is a schematic flow chart of a method for manufacturing an electrode sheet according to some embodiments of the present application.

[0076] According to some embodiments, active material and insulating material are coated on both surface sides of a conductive metal foil (e.g., aluminum foil) to pre-prepare raw materials for an electrode sheet (e.g., a positive electrode sheet). The active material region and the insulating material region are preferably symmetrical with respect to the center line of the width direction of the metal foil. The arrangement of the active material region and the insulating material region on the two surface sides is preferably the same. The active material regions on the two surface sides preferably have the same width and are both located in the middle area of ​​the metal foil. The insulating material regions on the two surface sides are respectively located on the upper and lower sides of the active material region, the insulating material regions on the two surface sides have the same width, and the insulating material region on the upper side and the insulating material region on the lower side have the same width.

[0077] According to some embodiments, at step S401 , the method of manufacturing an electrode sheet of a battery cell of the present application begins.

[0078] According to some embodiments, in step S402 , a first electrode tab and a second electrode tab are cut out respectively at a first edge and a second edge opposite to each other in a width direction perpendicular to a moving direction of the incoming electrode sheet.

[0079] According to some embodiments, in step S403 , a first image of a first surface of the electrode sheet material after tab cutting is obtained to determine a first set of dimensional parameters.

[0080] According to some embodiments, in step S404 , the electrode sheet material after tab cutting is cut into a first electrode sheet including a first edge and a second electrode sheet including a second edge along a width direction of the electrode sheet material.

[0081] According to some embodiments, in step S405 , a second image of a second surface of the first electrode sheet and the second electrode sheet is acquired to determine a second set of dimensional parameters, the second surface being opposite to the first surface.

[0082] According to some embodiments, in step S406 , cutting positions of the first tab and the second tab are adjusted according to the first set of dimensional parameters and the second set of dimensional parameters.

[0083] According to some embodiments, in step S407 , the cutting positions of the first electrode sheet and the second electrode sheet are adjusted according to the first set of size parameters and the second set of size parameters.

[0084] In step S408 , the method for manufacturing the electrode sheet of the battery cell of the present application ends.

[0085] According to some embodiments, the first and second surfaces of the electrode sheet material include, from the first edge to the second edge, a first metal diaphragm region, a first insulating material region, an active material region, a second insulating material region, and a second metal diaphragm region. The first set of dimensional parameters includes: a distance K1 from the root of the first tab to the active material region on the first surface, and a distance K2 from the root of the second tab to the active material region on the first surface. The second set of dimensional parameters includes: a distance N1 from the root of the first tab to the active material region on the second surface, and a distance N2 from the root of the second tab to the active material region on the second surface. Adjusting the cutting position of the first and second tabs based on the first and second sets of dimensional parameters includes: adjusting the tab cutting position so that the difference between the sum of distance K1 and distance N1 relative to the sum of distance K2 and distance N2 is minimized.

[0086] According to some embodiments, the cutting position is adjusted so that the difference between the sum of the distance K1 and the distance N1 and the sum of the distance K2 and the distance N2 is minimized, including: determining a first correction amount based on one-fourth of the difference between the sum of the distance K1 and the distance N1 and the sum of the distance K2 and the distance N2; and the first correction mechanism adjusts the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism by the first correction amount.

[0087] According to some embodiments, the second set of dimensional parameters further includes: a width M1 of the active material region on the second surface of the first electrode sheet, a width M2 of the active material region on the second surface of the second electrode sheet, a maximum width L1 of the second surface of the first electrode sheet, and a maximum width L2 of the second surface of the second electrode sheet. Adjusting the cutting position of the first and second electrode sheets according to the first and second sets of dimensional parameters includes: determining a width M3 of the active material region on the first surface of the first electrode sheet based on the difference between L1 and K1; determining a width M4 of the active material region on the first surface of the second electrode sheet based on the difference between L2 and K2; and adjusting the cutting position of the electrode sheets so that the difference between the sum of the width M3 and the width M1 is minimized relative to the sum of the width M4 and the width M2.

[0088] According to some embodiments, the slitting position of the electrode sheet is adjusted so that the difference between the sum of the width M3 and the width M1 relative to the sum of the width M4 and the width M2 is minimized, including: determining a second correction amount based on one-fourth of the difference between the sum of the width M3 and the width M1 relative to the sum of the width M4 and the width M2; and the second correction mechanism adjusts the position of the electrode sheet material relative to the slitting and cutting portion of the slitting mechanism according to the second correction amount.

[0089] According to some embodiments, the first visual detection mechanism is controlled to obtain a first image at a first time; the movement time required for the electrode sheet material to move from the position corresponding to the first visual detection mechanism to the position corresponding to the second visual detection mechanism is determined; the second time is determined based on the first time and the movement time; and the second visual detection mechanism is controlled to obtain a second image at a second time.

[0090] According to some embodiments, a die-cutting unit is used to cut out the first electrode tab R1 and the second electrode tab R2 from the upper and lower portions of the electrode sheet, respectively. For example, the die-cutting unit may be a laser die-cutting unit or any other suitable die-cutting unit.

[0091] According to some embodiments, different visual inspection units are used to perform inspection on both sides of the electrode sheet (the A surface side and the B surface side shown in FIG. 2 ).

[0092] For example, the first visual inspection unit is used to detect one or more of the following items on the first surface side (A surface side): the position of the root AP1 of the first pole tab R1, the position of the boundary line AP2 between the upper insulating material area and the active material area, the position of the boundary line AP4 between the active material area and the lower insulating material area, and the position of the root AP5 of the second pole tab R2.

[0093] For example, the second visual detection unit is used to detect one or more of the following items on the second surface side (B surface side): the position of the root BP1 of the first pole tab R1, the position of the boundary line BP2 between the upper insulating material area and the upper active material area, the position of the cutting line P3 between the first electrode sheet and the second electrode sheet, the position of the boundary line BP4 between the lower active material area and the lower insulating material area, and the position of the root BP5 of the second pole tab R2.

[0094] According to some embodiments, a slitting unit is used to slit the electrode sheet into a first electrode sheet and a second electrode sheet along the middle of the width of the electrode sheet. The slitting unit is, for example, a mechanical slitting tool or any other suitable slitting tool. For example, laser slitting is also feasible for the slitting unit, but the cost of laser slitting is higher than that of mechanical slitting tools.

[0095] According to some embodiments, the first visual detection unit is upstream of the slitting unit, and the second visual detection unit is downstream of the slitting unit. For example, the first visual detection unit detects the electrode sheet at timing T1. The spatial position of the center point of the electrode sheet area in the field of view of the first visual detection unit is represented by P1. Preferably, the electrode sheet moves at a uniform speed V. At timing T2 after a period of time ΔT, the second visual detection unit detects the electrode sheet. The spatial position of the center point of the electrode sheet area in the field of view of the second visual detection unit is represented by P2. The timing T1 for detection by the first visual detection unit, the timing T2 for detection by the second visual detection unit, the speed V of the movement of the electrode sheet, the spatial position P1 of the detection point of the first visual detection unit, and the spatial position P2 of the detection point of the second visual detection unit satisfy (T2-T1)*V=(P2-P1). Although the detection point of the first visual detection unit is represented by the center point of the field of view of the first visual detection unit and the detection point of the second visual detection unit is represented by the center point of the field of view of the second visual detection unit, the detection point of the first visual detection unit and the detection point of the second visual detection unit can also be represented by any other predefined points within their fields of view. Such an arrangement is preferred because it allows the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet to correspond to two opposite surfaces of the same position on the electrode sheet.

[0096] The specific manner in which the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to the same position of the electrode sheet on two relative surfaces is not limited to the specific manner exemplified above. For the electrode sheet used for a specific model of battery cell, the number of tabs of the electrode sheet, the size of the tabs of the electrode sheet, the shape of the tabs of the electrode sheet, and the distance between the tabs are all pre-set. The speed at which the electrode sheet moves during the manufacturing process is also pre-set. The electrode sheet raw material is marked with marks, each mark indicating the end of the electrode sheet for the previous battery cell and the beginning of the electrode sheet for the next battery cell. Based on the detection of the marks and the time and speed of the electrode sheet movement since the detection of the previous mark, it is possible to predict the position on the electrode sheet corresponding to the detection point of the first visual detection unit and the position on the electrode sheet corresponding to the detection point of the second visual detection unit at each moment. The position on the electrode sheet can be expressed, for example, as the distance from the most recently detected mark or, for example, as the distance from the most recently passed tab. Based on such a pre-judgment, the detection timing of the first visual detection unit and the detection timing of the second visual detection unit can be set so that the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to two relative surfaces at the same position of the electrode sheet. For example, by satisfying (T2-T1)*V=(P2-P1) as above, the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to two relative surfaces at the same position of the electrode sheet.

[0097] According to some embodiments, two correction units are provided to correct the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet and the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet, respectively.

[0098] For example, the first correction unit is used to minimize the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet through closed-loop feedback control based on the detection results of the first visual detection unit and the second visual detection unit. According to some embodiments, the first correction unit uses a portion (for example, one quarter) of the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet as the correction amount E to perform closed-loop feedback control to minimize the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet. Using one quarter of the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet as the correction amount E is merely an example. In other embodiments, the correction amount F can also be, for example, 1 / 2 to 1 / 8 (for example, 1 / 2, 1 / 3, 1 / 4, 1 / 5, 1 / 6, 1 / 7, 1 / 8) of the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet.

[0099] For example, the second correction unit is used to minimize the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet through closed-loop feedback control based on the detection results of the first visual detection unit and the second visual detection unit. According to some embodiments, the second correction unit uses a portion (for example, one-quarter) of the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet as the correction amount F to perform closed-loop feedback control to minimize the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet. Using one-quarter of the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet as the correction amount F is merely an example. In other embodiments, the correction amount F may also be, for example, 1 / 2 to 1 / 8 (for example, 1 / 2, 1 / 3, 1 / 4, 1 / 5, 1 / 6, 1 / 7, 1 / 8) of the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet.

[0100] According to some embodiments, based on the inspection results of the first visual inspection unit on the first surface side of the electrode sheet, the distance from the root AP1 of the first electrode tab R1 to the root AP5 of the second electrode tab R2 is expressed as the electrode sheet width L, the distance from the root AP1 of the first electrode tab R1 to the boundary line AP2 between the upper insulating material region and the upper active material region is expressed as the A-surface-side upper AT width K1, the width M of the active material region is expressed as the distance from the boundary line AP2 between the upper insulating material region and the upper active material region to the boundary line AP4 between the lower active material region and the lower insulating material region, and the distance from the root AP5 of the second electrode tab R2 to the boundary line AP4 between the active material region and the lower insulating material region is expressed as the A-surface-side lower AT width K2. These values ​​satisfy the relationship L = K1 + M + K2.

[0101] According to some embodiments, based on the detection result of the second visual detection unit on the second surface side of the electrode sheet, the width L1 of the first electrode sheet is expressed as the distance from the root BP1 of the first electrode tab R1 to the cutting line P3 between the first electrode sheet and the second electrode sheet, the width L2 of the second electrode sheet is expressed as the distance from the cutting line P3 between the first electrode sheet and the second electrode sheet to the root BP5 of the second electrode tab R2, and the width M1 of the upper active material area is expressed as the distance from the boundary line BP2 between the upper insulating material area and the upper active material area to the first electrode sheet. The width of the lower active material region M2 is expressed as the distance from the cutting line P3 between the first and second electrode sheets to the boundary line BP4 between the lower active material region and the lower insulating material region. The width of the first tab R1 from the root BP1 to the boundary line BP2 between the upper insulating material region and the upper active material region is expressed as N1. The distance from the boundary line BP4 between the lower active material region and the lower insulating material region to the root BP5 of the second tab R2 is expressed as N2. These values ​​satisfy the relationship L1 = M1 + N1 and L2 = M2 + N2.

[0102] According to some embodiments, the first deflection correction unit controls the widthwise position of the electrode sheet using closed-loop feedback based on a deflection correction amount E = ((K1 + N1) - (K2 + N2)) / 4. The deflection correction amount E = ((K1 + N1) - (K2 + N2)) / 4 represents one-quarter of the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet.

[0103] According to some embodiments, a second correction unit is used to control the position of the electrode sheet in the width direction based on a closed-loop feedback of a correction amount F = ((M1+M3)-(M2+M4)) / 4, where M3 = L1-K1 and M4 = L2-K2. The correction amount F = ((M1+M3)-(M2+M4)) / 4 represents one-fourth of the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet. Wherein M3 corresponds to the width of the upper active material area on the A surface side, and M4 corresponds to the width of the lower active material area on the A surface side. Since the electrode sheet has not been cut into the first electrode sheet and the second electrode sheet at the moment when the first visual inspection unit detects the A surface side of the electrode sheet, the first visual inspection unit cannot detect the width of the upper active material area on the A surface side and the width of the lower active material area on the A surface side. In the ideal case where manufacturing errors are excluded, the A surface side and the B surface side of the electrode sheet have exactly the same structure, and the first electrode sheet and the second electrode sheet obtained by cutting also have exactly the same structure (symmetrical up and down). Therefore, the present invention indirectly estimates the width M3 of the upper active material region on the A surface side and the width M4 of the lower active material region on the A surface side by calculating M3=L1-K1 and M4=L2-K2.

[0104] According to some embodiments, active material is applied to both surfaces of a conductive metal foil (e.g., copper foil) to pre-prepare raw materials for an electrode sheet (e.g., a negative electrode sheet). The active material regions are preferably symmetrical with respect to the center line of the metal foil in the width direction. The arrangement of the active material regions on both surfaces is preferably the same. The active material regions on both surfaces preferably have the same width and are both located in the center region of the metal foil.

[0105] According to some embodiments, at step S401 , the method of manufacturing an electrode sheet of a battery cell of the present application begins.

[0106] According to some embodiments, in step S402 , a first electrode tab and a second electrode tab are cut out respectively at a first edge and a second edge opposite to each other in a width direction perpendicular to a moving direction of the incoming electrode sheet.

[0107] According to some embodiments, in step S403 , a first image of a first surface of the electrode sheet material after tab cutting is obtained to determine a first set of dimensional parameters.

[0108] According to some embodiments, in step S404 , the electrode sheet material after tab cutting is cut into a first electrode sheet including a first edge and a second electrode sheet including a second edge along a width direction of the electrode sheet material.

[0109] According to some embodiments, in step S405 , a second image of a second surface of the first electrode sheet and the second electrode sheet is acquired to determine a second set of dimensional parameters, the second surface being opposite to the first surface.

[0110] According to some embodiments, in step S406 , cutting positions of the first tab and the second tab are adjusted according to the first set of dimensional parameters and the second set of dimensional parameters.

[0111] According to some embodiments, in step S407 , the cutting positions of the first electrode sheet and the second electrode sheet are adjusted according to the first set of size parameters and the second set of size parameters.

[0112] In step S408 , the method for manufacturing the electrode sheet of the battery cell of the present application ends.

[0113] According to some embodiments, the first and second surfaces of the electrode sheet material include a first metal diaphragm region, an active material region, and a second metal diaphragm region from the first edge to the second edge. The first set of dimensional parameters includes: the distance H from the first boundary AP1 of the active material region on the first surface to the root AP2 of the first tab; A1 , and the distance H from the root AP5 of the second tab on the first surface to the second boundary AP4 of the active material area A2The second set of dimensional parameters includes: the distance H from the first boundary BP1 of the active material area on the second surface to the root BP2 of the first tab; B1 , and the distance H from the root BP5 of the second tab on the second surface to the second boundary BP4 of the active material region B2 Adjusting the cutting positions of the first and second tabs according to the first and second sets of dimensional parameters includes: adjusting the tab cutting positions to minimize the difference between the sum of the distance HA1 and the distance N1 and the sum of the distance K2 and the distance N2.

[0114] According to some embodiments, the cutting position is adjusted so that the distance H A1 and distance H A2 The sum of the values ​​relative to the distance H B1 and distance H B2 Minimize the difference between the sum of the values, including: according to the distance H A1 and distance H A2 The sum of the values ​​relative to the distance H B1 and distance H B2 The first deviation correction amount is determined by one quarter of the difference between the sum of the values; and the first deviation correction mechanism adjusts the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism by the first deviation correction amount.

[0115] According to some embodiments, the second set of dimensional parameters further includes: a distance M from the root of the tab on the second surface of the first electrode sheet to the slitting cutting track, and a distance N from the root of the tab on the second surface of the second electrode sheet to the slitting cutting track. Adjusting the slitting positions of the first and second electrode sheets according to the second set of dimensional parameters includes: minimizing the difference between the distance M from the root of the tab on the second surface of the first electrode sheet to the slitting cutting track and the distance N from the root of the tab on the second surface of the second electrode sheet to the slitting cutting track by adjusting the slitting positions of the electrode sheets.

[0116] According to some embodiments, the slitting position of the electrode sheet is adjusted so that the difference between the distance M from the root of the electrode ear on the second surface of the first electrode sheet to the slitting cutting track and the distance N from the root of the electrode ear on the second surface of the second electrode sheet to the slitting cutting track is minimized, including: determining the second correction amount based on half of the difference between the distance M from the root of the electrode ear on the second surface of the first electrode sheet to the slitting cutting track and the distance N from the root of the electrode ear on the second surface of the second electrode sheet to the slitting cutting track; and the second correction mechanism adjusts the position of the electrode sheet material relative to the slitting cutting part of the slitting mechanism according to the second correction amount.

[0117] According to some embodiments, the first visual detection mechanism is controlled to obtain a first image at a first time; the movement time required for the electrode sheet material to move from the position corresponding to the first visual detection mechanism to the position corresponding to the second visual detection mechanism is determined; the second time is determined based on the first time and the movement time; and the second visual detection mechanism is controlled to obtain a second image at a second time.

[0118] According to some embodiments, a die-cutting unit is used to cut out the first electrode tab R1 and the second electrode tab R2 from the upper and lower portions of the electrode sheet, respectively. For example, the die-cutting unit may be a laser die-cutting unit or any other suitable die-cutting unit.

[0119] According to some embodiments, different visual inspection units are used to perform inspection on both sides of the electrode sheet (the A surface side and the B surface side shown in FIG3 ).

[0120] For example, the first visual detection unit is used to detect one or more of the following items on the first surface side (A surface side): the position of the first boundary AP1 of the active material area, the position of the root AP2 of the first pole tab R1, the position of the root AP4 of the second pole tab R2, and the position of the second boundary AP5 of the active material area.

[0121] For example, a second visual detection unit is used to detect one or more of the following items on the second surface side (B surface side): the position of the first boundary BP1 of the upper active material area, the position of the root BP2 of the first pole tab R1, the position of the cutting line BP3 between the first electrode sheet and the second electrode sheet, the position of the root BP4 of the second pole tab R2, and the position of the second boundary BP5 of the active material area.

[0122] According to some embodiments, the first visual detection unit is upstream of the slitting unit, and the second visual detection unit is downstream of the slitting unit. For example, the first visual detection unit detects the electrode sheet at timing T1. The spatial position of the center point of the electrode sheet area in the field of view of the first visual detection unit is represented by P1. Preferably, the electrode sheet moves at a uniform speed V. At timing T2 after a period of time ΔT, the second visual detection unit detects the electrode sheet. The spatial position of the center point of the electrode sheet area in the field of view of the second visual detection unit is represented by P2. The timing T1 for detection by the first visual detection unit, the timing T2 for detection by the second visual detection unit, the speed V of the movement of the electrode sheet, the spatial position P1 of the detection point of the first visual detection unit, and the spatial position P2 of the detection point of the second visual detection unit satisfy (T2-T1)*V=(P2-P1). Although the detection point of the first visual detection unit is represented by the center point of the field of view of the first visual detection unit and the detection point of the second visual detection unit is represented by the center point of the field of view of the second visual detection unit, the detection point of the first visual detection unit and the detection point of the second visual detection unit can also be represented by any other predefined points within their fields of view. Such an arrangement is preferred because it allows the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet to correspond to two opposite surfaces of the same position on the electrode sheet.

[0123] The specific manner in which the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to the same position of the electrode sheet on two relative surfaces is not limited to the specific manner exemplified above. For the electrode sheet used for a specific model of battery cell, the number of tabs of the electrode sheet, the size of the tabs of the electrode sheet, the shape of the tabs of the electrode sheet, and the distance between the tabs are all pre-set. The speed at which the electrode sheet moves during the manufacturing process is also pre-set. The electrode sheet raw material is marked with marks, each mark indicating the end of the electrode sheet for the previous battery cell and the beginning of the electrode sheet for the next battery cell. Based on the detection of the marks and the time and speed of the electrode sheet movement since the detection of the previous mark, it is possible to predict the position on the electrode sheet corresponding to the detection point of the first visual detection unit and the position on the electrode sheet corresponding to the detection point of the second visual detection unit at each moment. The position on the electrode sheet can be expressed, for example, as the distance from the most recently detected mark or, for example, as the distance from the most recently passed tab. Based on such a pre-judgment, the detection timing of the first visual detection unit and the detection timing of the second visual detection unit can be set so that the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to two relative surfaces at the same position of the electrode sheet. For example, by satisfying (T2-T1)*V=(P2-P1) as above, the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to two relative surfaces at the same position of the electrode sheet.

[0124] According to some embodiments, the incoming electrode material is a laminated material, and for an electrode sheet, the spacing between each two tabs is equal. The mechanical running distance between the first visual inspection unit and the second visual inspection unit is represented as K, and the tab spacing is represented as G. There are J tabs between the first visual inspection unit and the second visual inspection unit, and K / G is an integer = J. In this example case, the step height value calculated by the first visual inspection unit is offset by J data from the step height value calculated by the second visual inspection unit to ensure that the AB surface correction value is for two opposite surfaces at the same position of the electrode sheet.

[0125] According to some embodiments, the incoming electrode sheet material is a wound material, and for one electrode sheet, the size of the distance between the tabs gradually changes. The design value of the distance between each two tabs of the electrode sheet varies depending on the model of the battery cell. Each model of battery cell has a corresponding mark, and each mark indicates the end of the electrode sheet for the previous battery cell and the beginning of the electrode sheet for the next battery cell. Starting from each mark, the tabs of the electrode sheet can be numbered 1, 2, 3, ... in sequence until the next mark appears. In such an exemplary case, the first visual detection unit and the second visual detection unit can detect the height and / or the width of the step area corresponding to the corresponding tab number.

[0126] According to some embodiments, two correction units are provided to correct the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet and the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet respectively.

[0127] For example, the first correction unit is used to minimize the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet through closed-loop feedback control based on the detection results of the first visual detection unit and the second visual detection unit. According to some embodiments, the first correction unit uses a portion (for example, one quarter) of the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet as the correction amount Z for closed-loop feedback control to minimize the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet. Taking one quarter of the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet as the correction amount Z is merely an example. In other embodiments, the correction amount Z may also be, for example, 1 / 2 to 1 / 8 (for example, 1 / 2, 1 / 3, 1 / 4, 1 / 5, 1 / 6, 1 / 7, 1 / 8) of the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet.

[0128] For example, the second correction unit is used to minimize the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet through closed-loop feedback control based on the detection results of the first visual detection unit and the second visual detection unit. According to some embodiments, the second correction unit uses a portion (for example, one half) of the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet as the correction amount W for closed-loop feedback control to minimize the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet. Taking one half of the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet as the correction amount W is merely an example. In other embodiments, the correction amount W can also be, for example, 1 / 8 to 6 / 8 of the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet (for example, 1 / 8, 2 / 8 = 1 / 4, 3 / 8, 4 / 8 = 1 / 2, 5 / 8, 6 / 8 = 3 / 4).

[0129] According to some embodiments, based on the detection result of the first visual detection unit on the first surface side of the electrode sheet, the distance from the root AP2 of the first electrode tab R1 to the root AP4 of the second electrode tab R2 is expressed as the electrode sheet width L, and the distance H from the first boundary of the active material area on the first surface to the root of the first electrode tab is expressed as A1 (Distance from AP1 to AP2) is expressed as the width of the step region on the first edge side of the first surface, and the distance H from the first boundary of the active material region on the second surface to the root of the first tab is expressed as B1 (Distance from BP1 to BP2) is expressed as the width of the step region on the first edge side of the second surface, and the distance H from the second boundary of the active material region on the first surface to the root of the second tab is expressed as A2 (Distance from AP4 to AP5) is expressed as the width of the step region on the second edge side of the first surface, and the distance H from the second boundary of the active material region on the second surface to the root of the second tab is expressed as B2 (The distance from BP4 to BP5) is expressed as the width of the step region on the second edge side on the second surface.

[0130] According to some embodiments, based on the detection results of the second visual detection unit on the second surface side of the electrode sheet, the width M of the first electrode sheet is expressed as the distance from the root BP2 of the first electrode tab R1 to the cutting line BP3 between the first electrode sheet and the second electrode sheet, and the width N of the second electrode sheet is expressed as the distance from the cutting line BP3 between the first electrode sheet and the second electrode sheet to the root BP4 of the second electrode tab R2.

[0131] According to some embodiments, the first correction unit is used based on the correction amount Z=((H A1 +H B1 )-(H A2 +H B2)) / 4 closed-loop feedback controls the widthwise position of the electrode sheet. Correction amount Z = ((H A1 +H B1 )-(H A2 +H B2 )) / 4 represents one quarter of the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet.

[0132] According to some embodiments, a second correction unit is used to control the position of the electrode sheet in the width direction based on a closed-loop feedback of a correction amount W=(MN) / 2. The correction amount W=(MN) / 2 represents half of the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet. Since the electrode sheet has not been cut into the first electrode sheet and the second electrode sheet at the moment when the first visual detection unit detects the surface side of the electrode sheet A, the first visual detection unit cannot detect the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet. In an ideal case where manufacturing errors are excluded, the surface side A and the surface side B of the electrode sheet have exactly the same structure, and the first electrode sheet and the second electrode sheet obtained by cutting also have exactly the same structure (symmetrical up and down).

[0133] Please refer to FIG. 5 , which is a schematic structural diagram of an apparatus for manufacturing electrode sheets according to some embodiments of the present application.

[0134] According to some embodiments, the device 500 for manufacturing electrode sheets disclosed herein includes: a material traction unit 501, a first correction unit 502 and a second correction unit 505, a die-cutting unit 503 and a slitting unit 506, a first visual inspection unit 504 and a second visual inspection unit 507, and a control unit 508.

[0135] According to some embodiments, relative to the direction of movement of the electrode sheet from upstream to downstream, a first deflection correction unit 502, a die-cutting unit 503, a first visual inspection unit 504, a second deflection correction unit 505, a slitting unit 506, and a second visual inspection unit 507 are sequentially arranged. The movement of the electrode sheet from upstream to downstream is preferably uniform.

[0136] According to some embodiments, the first visual inspection unit 504 is used to inspect, on the first surface side of an electrode sheet (e.g., a positive electrode sheet), the following: the position of the root AP1 of the first electrode tab R1 on the first surface side; the position of the boundary line AP2 between the upper insulating material region and the active material region on the first surface side; the position of the boundary line AP4 between the active material region and the lower insulating material region on the first surface side; and the position of the root AP5 of the second electrode tab R2 on the first surface side. The position of the root AP1 of the first electrode tab R1 corresponds to the extension line of the roots of each electrode tab in the length direction of the upper electrode sheet. The boundary line between the upper insulating material region and the active material region is represented as AP2. The boundary line between the active material region and the lower insulating material region is represented as AP4. The position of the root AP5 of the second electrode tab R2 corresponds to the extension line of the roots of each electrode tab in the length direction of the lower electrode sheet. At the inspection point of the first visual inspection unit 504, the electrode sheet has not yet been cut. Therefore, the first visual inspection unit 504 cannot detect the cutting line.

[0137] According to some embodiments, based on the inspection results of the first visual inspection unit on the first surface side, the position of the root AP1 of the first tab R1 and the position of the root AP5 of the second tab R2 can be determined based on the position of the bottom of the recessed portion between the tabs. For example, the position of the boundary line AP2 between the upper insulating material region and the active material region and the position of the boundary line AP4 between the active material region and the lower insulating material region can be determined based on the color difference between the active material region and the lower insulating material region.

[0138] Based on the detection results of the first visual inspection unit for the first surface side, the distance from the root AP1 of the first pole tab R1 to the root AP5 of the second pole tab R2 (this distance corresponds to the electrode sheet width) can be expressed as the electrode sheet width L, the distance from the root AP1 of the first pole tab R1 to the boundary line AP2 between the upper insulating material region and the upper active material region can be expressed as K1 (i.e., AT width K1 on the A surface side), the distance from the boundary line AP2 between the upper insulating material region and the upper active material region to the boundary line AP4 between the lower active material region and the lower insulating material region can be expressed as the width M of the active material region (i.e., A surface side film width M), and the distance from the root AP5 of the second pole tab R2 to the boundary line AP4 between the active material region and the lower insulating material region can be expressed as K2 (i.e., A surface side lower AT width K2). These values ​​satisfy the relationship L=K1+M+K2, that is, the electrode sheet width L=AT width K1 on the A surface side+A surface side film width M+AT width K2 on the A surface side.

[0139] According to some embodiments, the electrode sheet width L seen on the first surface side is equal to the electrode sheet width L seen on the second surface side, and the film width M seen on the first surface side is equal to the film width M seen on the second surface side.

[0140] According to some embodiments, a second visual detection unit is used to detect on the second surface side: the position of the root BP1 of the first pole tab R1 on the second surface side, the position of the boundary line BP2 between the upper insulating material area and the upper active material area on the second surface side, the position P3 of the cutting line P3 between the first electrode sheet and the second electrode sheet on the second surface side, the position of the boundary line BP4 between the lower active material area and the lower insulating material area on the second surface side, and the position of the root BP5 of the second pole tab R2 on the second surface side.

[0141] Based on the detection result of the second visual detection unit on the second surface side, the distance from the root BP1 of the first electrode tab R1 to the cutting line P3 between the first electrode sheet and the second electrode sheet can be expressed as the width L1 of the first electrode sheet (that is, the upper pole width L1 on the B surface side), the distance from the cutting line P3 between the first electrode sheet and the second electrode sheet to the root BP5 of the second electrode tab R2 can be expressed as the width L2 of the second electrode sheet (that is, the lower pole width L2 on the B surface side), and the distance from the boundary line BP2 between the upper insulating material region and the upper active material region to the cutting line P3 between the first electrode sheet and the second electrode sheet can be expressed as the width M1 of the upper active material region (that is, The distance from the cutting line P3 between the first electrode sheet and the second electrode sheet to the boundary line AP4 between the lower active material region and the lower insulating material region is expressed as the width M2 of the lower active material region (i.e., the lower film width M2 on the B surface side), the width from the root BP1 of the first electrode tab R1 to the boundary line BP2 between the upper insulating material region and the upper active material region is expressed as the width N1 (i.e., the upper AT width N1 on the B surface side), and the distance from the boundary line BP4 between the lower active material region and the lower insulating material region to the root BP5 of the second electrode tab R2 is expressed as N2 (i.e., the lower AT width N2 on the B surface side). These values ​​satisfy the relationship L1 = M1 + N1 and L2 = M2 + N2. That is, the upper electrode width L1 on the B surface side = the upper film width M1 on the B surface side + the upper AT width N1 on the B surface side, and the lower electrode width L2 on the B surface side = the lower film width M2 on the B surface side + the lower AT width N2 on the B surface side.

[0142] According to some embodiments, a first deflection correction unit is used to control the position of the electrode sheet in the width direction through closed-loop feedback based on a deflection correction amount E = ((K1 + N1) - (K2 + N2)) / 4. The deflection correction amount E of the first deflection correction unit is obtained by calculating ((K1 + N1) - (K2 + N2)) / 4 based on the detection results of the first visual detection unit and the detection results of the second visual detection unit, where ((K1 + N1) - (K2 + N2)) / 4 represents one-quarter of the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet.

[0143] According to some embodiments, a second deflection correction unit is used to control the position of the electrode sheet in the width direction based on a closed-loop feedback control based on a deflection correction amount F = ((M1 + M3) - (M2 + M4)) / 4, where M3 = L1 - K1 and M4 = L2 - K2. The deflection correction amount F of the second deflection correction unit is obtained by calculating ((M1 + M3) - (M2 + M4)) / 4 based on the detection results of the first visual detection unit and the detection results of the second visual detection unit, where ((M1 + M3) - (M2 + M4)) / 4 represents one-quarter of the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet.

[0144] According to some embodiments, the timing T1 of the detection by the first visual detection unit, the timing T2 of the detection by the second visual detection unit, the speed V of the movement of the electrode sheet, the spatial position P1 of the detection point of the first visual detection unit, and the spatial position P2 of the detection point of the second visual detection unit satisfy (T2-T1)*V=(P2-P1). This setting makes the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to two relative surfaces of the same position of the electrode sheet.

[0145] For an electrode sheet used for a specific type of battery cell, the number of tabs of the electrode sheet, the size of the tabs of the electrode sheet, the shape of the tabs of the electrode sheet, and the distance between the tabs are all pre-set.

[0146] According to some embodiments, two correcting units are provided to dynamically correct the position of the electrode sheet in the width direction. The first correcting unit of the two correcting units is located upstream of the second correcting unit. The first correcting unit minimizes the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet through closed-loop feedback control based on the detection results of the first visual detection unit and the second visual detection unit, so that the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet is as close to 0 as possible. The second correcting unit minimizes the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet through closed-loop feedback control based on the detection results of the first visual detection unit and the second visual detection unit, so that the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet is as close to 0 as possible.

[0147] According to some embodiments, the first visual inspection unit 504 is used to inspect on the first surface side of an electrode sheet (e.g., a negative electrode sheet): the position of the first boundary AP1 of the active material region on the first surface side, the position of the root AP2 of the first electrode tab R1 on the first surface side, the position of the root AP4 of the second electrode tab R2 on the first surface side, and the position of the second boundary AP5 of the active material region on the first surface side. The position of the root AP2 of the first electrode tab R1 corresponds to the extension line of the roots of the respective electrode tabs in the length direction of the upper electrode sheet. The position of the root AP4 of the second electrode tab R2 corresponds to the extension line of the roots of the respective electrode tabs in the length direction of the lower electrode sheet. At the inspection point of the first visual inspection unit 504, the electrode sheet has not yet been cut. Therefore, the first visual inspection unit 504 cannot detect the cutting line.

[0148] According to some embodiments, based on the inspection results of the first visual inspection unit on the first surface side, the position of the root AP2 of the first tab R1 and the position of the root AP4 of the second tab R2 can be determined based on, for example, the position of the bottom of the recessed portion between the tabs. For example, the position of the first boundary AP1 of the active material region on the first surface side and the position of the second boundary AP5 of the active material region on the first surface side can be determined based on the color difference between the active material region and the metal foil.

[0149] Based on the detection result of the first visual inspection unit on the first surface side, the distance from the root AP2 of the first electrode tab R1 to the root AP4 of the second electrode tab R2 (this distance corresponds to the electrode sheet width) can be expressed as the electrode sheet width L. The active material area covers a portion of the electrode tab. The portion of the electrode tab covered with active material is called the step area. The distance H from the first boundary of the active material area on the first surface to the root of the first electrode tab is A1 (Distance from AP1 to AP2) represents the width of the step region on the first edge side of the first surface, and the distance H from the first boundary of the active material region to the root of the first tab on the second surface is B1 (Distance from BP1 to BP2) represents the width of the step region on the first edge side of the second surface, and the distance H from the second boundary of the active material region on the first surface to the root of the second tab is A2 (Distance from AP4 to AP5) represents the width of the step region on the second edge side of the first surface, and the distance H from the second boundary of the active material region on the second surface to the root of the second tab is B2 (Distance from BP4 to BP5) represents the width of the step region on the second edge side on the second surface.

[0150] According to some embodiments, the electrode sheet width L seen on the first surface side is equal to the electrode sheet width L seen on the second surface side, and the active material region width seen on the first surface side is equal to the active material region width seen on the second surface side.

[0151] According to some embodiments, a second visual inspection unit is used to inspect, on the second surface side, the following: a distance M from the base portion BP2 of the second surface of the first electrode sheet to the slitting cutting track BP3; and a distance N from the base portion BP4 of the second surface of the second electrode sheet to the slitting cutting track BP3. The distance M from the base portion BP2 of the second surface of the first electrode sheet to the slitting cutting track BP3 represents the width of the first electrode sheet. The distance N from the base portion BP4 of the second surface of the second electrode sheet to the slitting cutting track BP3 represents the width of the second electrode sheet.

[0152] Based on the detection results of the second visual detection unit on the second surface side, the distance from the root of the tab BP2 on the second surface of the first electrode sheet to the slitting cutting track BP3 can be expressed as M, and the distance from the root of the tab BP4 on the second surface of the second electrode sheet to the slitting cutting track BP3 can be expressed as N.

[0153] According to some embodiments, the first correction unit is used to correct the deviation based on the correction amount Z=((H A1 +H B1 )-(H A2 +H B2 )) / 4 closed-loop feedback controls the position of the electrode sheet in the width direction. The correction amount Z of the first correction unit is obtained by calculating ((HA1+HB1)-(HA2+HB2)) / 4 based on the detection results of the first visual detection unit and the detection results of the second visual detection unit. ((HA1+HB1)-(HA2+HB2)) / 4 represents one-quarter of the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet.

[0154] According to some embodiments, a second deflection correction unit is used to control the widthwise position of the electrode sheet through closed-loop feedback based on a deflection correction amount W = (MN) / 2. The deflection correction amount W of the second deflection correction unit is obtained by calculating (MN) / 2 based on the detection result of the second visual detection unit, where (MN) / 2 represents half of the difference between the extreme width dimensions of the first electrode sheet and the extreme width dimensions of the second electrode sheet.

[0155] According to some embodiments, the timing T1 of the detection by the first visual detection unit, the timing T2 of the detection by the second visual detection unit, the speed V of the movement of the electrode sheet, the spatial position P1 of the detection point of the first visual detection unit, and the spatial position P2 of the detection point of the second visual detection unit satisfy (T2-T1)*V=(P2-P1). This setting makes the detection position of the first visual detection unit on the electrode sheet and the subsequent detection position of the second visual detection unit on the electrode sheet correspond to two relative surfaces of the same position of the electrode sheet.

[0156] For an electrode sheet used for a specific type of battery cell, the number of tabs of the electrode sheet, the size of the tabs of the electrode sheet, the shape of the tabs of the electrode sheet, and the distance between the tabs are all pre-set.

[0157] According to some embodiments, two correcting units are provided to dynamically correct the position of the electrode sheet in the width direction. The first correcting unit of the two correcting units is located upstream of the second correcting unit. The first correcting unit minimizes the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet through closed-loop feedback control based on the detection results of the first visual detection unit and the second visual detection unit, so that the difference between the step area of ​​the first electrode sheet and the step area of ​​the second electrode sheet is as close to 0 as possible. The detection results of the second visual detection unit of the second correcting unit minimize the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet through closed-loop feedback control, so that the difference between the extreme width size of the first electrode sheet and the extreme width size of the second electrode sheet is as close to 0 as possible.

[0158] To minimize manufacturing errors in the electrode sheet, the present disclosure illustratively describes the various embodiments described above. The present disclosure minimizes manufacturing errors in the electrode sheet by, for example, minimizing the difference between the insulating material region of the first electrode sheet and the insulating material region of the second electrode sheet, or minimizing the difference between the active material region of the first electrode sheet and the active material region of the second electrode sheet through closed-loop feedback control.

[0159] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 device for manufacturing an electrode sheet of a battery cell, the device comprising: An incoming material traction mechanism, used for guiding the incoming electrode sheet material to move from upstream to downstream according to the processing direction, wherein the incoming electrode sheet material has a first edge and a second edge in a width direction perpendicular to the moving direction of the incoming electrode sheet material; The device is arranged in sequence from upstream to downstream according to the direction of movement of the electrode sheet material: A first deviation correction mechanism is used to adjust the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism in the width direction; The die-cutting mechanism comprises a tab cutting portion for cutting tabs on the incoming electrode sheet; A first visual inspection mechanism is used to obtain a first image of a first surface of the electrode sheet material after the tab is cut; A second deviation correction mechanism is used to adjust the position of the electrode sheet material relative to the slitting and cutting part of the slitting mechanism in the width direction; The slitting mechanism comprises a slitting and cutting part for slitting the electrode sheet into a first electrode sheet and a second electrode sheet, wherein the first electrode sheet comprises the first edge and the second electrode sheet comprises the second edge; A second visual detection mechanism is used to obtain a second image of a second surface of the first electrode sheet and the second electrode sheet opposite to the first surface; and A control unit is used to control the first deflection correcting mechanism and the second deflection correcting mechanism according to the first image and the second image.

2. The device for manufacturing an electrode sheet for a battery cell according to claim 1, wherein: The control unit is used to control the first deviation correction mechanism through closed-loop feedback according to the first image and the second image, so as to minimize the difference between the insulating material area of ​​the first electrode sheet and the insulating material area of ​​the second electrode sheet; The control unit is used to control the second deviation correction mechanism through closed-loop feedback according to the first image and the second image, so as to minimize the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet; as well as The first electrode sheet and the second electrode sheet are suitable for being used as positive electrode sheets of a battery cell.

3. The device for manufacturing an electrode sheet for a battery cell according to claim 2, wherein: The control unit is used to determine a first deviation correction amount according to a difference between an insulating material area of ​​the first electrode sheet and an insulating material area of ​​the second electrode sheet, The first deviation correction mechanism adjusts the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism according to the first deviation correction amount.

4. The device for manufacturing an electrode sheet for a battery cell according to claim 2, wherein: The control unit is used to determine the second deviation correction amount according to the difference between the active material area of ​​the first electrode sheet and the active material area of ​​the second electrode sheet, The second deflection correction mechanism adjusts the position of the electrode sheet material relative to the slitting and cutting portion of the slitting mechanism according to the second deflection correction amount.

5. The device for manufacturing an electrode sheet for a battery cell according to claim 2, wherein: The first surface and the second surface of the electrode sheet material include a first metal film region, a first insulating material region, an active material region, a second insulating material region and a second metal film region from the first edge to the second edge; The tab cutting unit includes: a first cutting head for cutting a first tab in the first metal diaphragm region and the first insulating material region; and a second cutting head for cutting a second tab in the second metal diaphragm region and the second insulating material region. The control unit is further configured to: Determine, based on the first image and the second image, a distance K1 from the root of the first electrode tab on the first surface to the active material region, a distance N1 from the root of the first electrode tab on the second surface to the active material region, a distance K2 from the root of the second electrode tab on the first surface to the active material region, and a distance N2 from the root of the second electrode tab on the second surface to the active material region, and The first deviation correction mechanism is controlled to adjust the position of the electrode sheet material relative to the first cutting head and the second cutting head in the width direction so that the difference between the sum of the distance K1 and the distance N1 and the sum of the distance K2 and the distance N2 is minimized.

6. The device for manufacturing an electrode sheet for a battery cell according to claim 2, wherein: The control unit is further configured to: Determine, based on the first image and the second image, a width M3 of the active material region on the first surface of the first electrode sheet, a width M4 of the active material region on the first surface of the second electrode sheet, a width M1 of the active material region on the second surface of the first electrode sheet, and a width M2 of the active material region on the second surface of the second electrode sheet, and The second deviation correcting mechanism is controlled to adjust the position of the electrode sheet material relative to the slitting cutting portion in the width direction so that the difference between the sum of the width M3 and the width M1 and the sum of the width M4 and the width M2 is minimized.

7. The device for manufacturing an electrode sheet for a battery cell according to claim 1, wherein: The control unit is used to control the first deviation correction mechanism through closed-loop feedback according to the first image and the second image, so that the step area where the pole ear of the first electrode sheet overlaps with the active material area and the pole ear of the second electrode sheet overlaps with the active material area. Minimize the difference between the step areas where the material area overlaps; The control unit is used to control the second deviation correction mechanism through closed-loop feedback according to the first image and the second image, so as to minimize the difference between the electrode width of the first electrode sheet and the electrode width of the second electrode sheet; as well as The first electrode sheet and the second electrode sheet are suitable for being used as negative electrode sheets of a battery cell.

8. The device for manufacturing an electrode sheet for a battery cell according to claim 7, wherein: The control unit is used to determine a first deviation correction amount according to a difference between a step area of ​​the first electrode sheet and a step area of ​​the second electrode sheet, The first deviation correction mechanism adjusts the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism according to the first deviation correction amount.

9. The device for manufacturing an electrode sheet for a battery cell according to claim 7, wherein: The control unit is used to determine the second deviation correction amount according to the difference between the width of the first electrode sheet and the width of the second electrode sheet, The second deflection correction mechanism adjusts the position of the electrode sheet material relative to the slitting and cutting portion of the slitting mechanism according to the second deflection correction amount.

10. The device for manufacturing an electrode sheet for a battery cell according to claim 7, wherein: The first surface and the second surface of the electrode sheet material include a first metal membrane area, an active material area, and a second metal membrane area from the first edge to the second edge; The tab cutting unit includes: a first cutting head for cutting a first tab in the first metal diaphragm region and the active material region; and a second cutting head for cutting a second tab in the second metal diaphragm region and the active material region. The control unit is further configured to: Determine, based on the first image and the second image, a distance HA1 from the boundary of the active material region on the first surface close to the first edge to the root of the first electrode tab, a distance HA2 from the boundary of the active material region on the first surface close to the second edge to the root of the second electrode tab, a distance HB1 from the boundary of the active material region on the second surface close to the first edge to the root of the first electrode tab, and a distance HB2 from the boundary of the active material region on the second surface close to the second edge to the root of the second electrode tab; and The first deviation correcting mechanism is controlled to adjust the position of the electrode sheet material relative to the first cutting head and the second cutting head in the width direction so that the difference between the sum of the distance HA1 and the distance HB1 and the sum of the distance HA2 and the distance HB2 is minimized.

11. The device for manufacturing an electrode sheet for a battery cell according to claim 7, wherein: The control unit is further configured to: Determine the distance M from the root of the second surface of the first electrode sheet to the slitting cutting track and the distance N from the root of the second surface of the second electrode sheet to the slitting cutting track according to the second image, and The second deviation correcting mechanism is controlled to adjust the position of the electrode sheet material relative to the slitting and cutting portion in the width direction so that the difference between the distance M and the distance N is minimized.

12. The device for manufacturing an electrode sheet for a battery cell according to any one of claims 1 to 11, wherein: The timing for the first visual inspection mechanism to acquire the first image, the timing for the second visual inspection mechanism to acquire the second image, and the movement speed of the electrode sheet incoming material are set so that the inspection point of the first visual inspection mechanism and the inspection point of the second visual inspection mechanism correspond to two relative surfaces at the same position on the electrode sheet incoming material.

13. A method for manufacturing an electrode sheet of a battery cell, applied to the device for manufacturing an electrode sheet of a battery cell according to claim 1, the method comprising: Cut out a first electrode tab and a second electrode tab respectively at a first edge and a second edge opposite to each other in a width direction perpendicular to a moving direction of the electrode sheet material; Acquire a first image of a first surface of an incoming electrode sheet material after tab cutting to determine a first set of dimensional parameters; Cutting the electrode sheet material into a first electrode sheet including a first edge and a second electrode sheet including a second edge along the width direction of the electrode sheet material after the tab cutting is completed; Acquire a second image of a second surface of the first electrode sheet and the second electrode sheet to determine a second set of dimensional parameters, the second surface being opposite to the first surface; Adjusting the cutting positions of the first pole tab and the second pole tab according to the first set of size parameters and the second set of size parameters; as well as The cutting positions of the first electrode sheet and the second electrode sheet are adjusted according to the first set of size parameters and the second set of size parameters.

14. The method for manufacturing an electrode sheet for a battery cell according to claim 13, wherein: The first surface and the second surface of the electrode sheet material include a first metal film region, a first insulating material region, an active material region, a second insulating material region and a second metal film region from the first edge to the second edge; The first set of size parameters includes: a distance K1 from the root of the first electrode tab on the first surface to the active material region and a distance K2 from the root of the second electrode tab on the first surface to the active material region; The second set of size parameters includes: a distance N1 from the root of the first electrode tab on the second surface to the active material region and a distance N2 from the root of the second electrode tab on the second surface to the active material region; The adjusting the cutting positions of the first and second tabs according to the first set of dimensional parameters and the second set of dimensional parameters comprises: minimizing the difference between the sum of the distance K1 and the distance N1 and the sum of the distance K2 and the distance N2 by adjusting the cutting position; and The first electrode sheet and the second electrode sheet are suitable for being used as positive electrode sheets of a battery cell.

15. The method for manufacturing an electrode sheet for a battery cell according to claim 14, wherein: The step of adjusting the cutting position so that the difference between the sum of the distance K1 and the distance N1 and the sum of the distance K2 and the distance N2 is minimized includes: Determine a first deviation correction amount based on one quarter of the difference between the sum of the distance K1 and the distance N1 and the sum of the distance K2 and the distance N2; and The first deviation correction mechanism adjusts the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism by a first deviation correction amount.

16. The method for manufacturing an electrode sheet for a battery cell according to claim 14, wherein: The second set of size parameters also includes: a width M1 of the active material region on the second surface of the first electrode sheet, a width M2 of the active material region on the second surface of the second electrode sheet, a top width L1 of the second surface of the first electrode sheet, and a top width L2 of the second surface of the second electrode sheet, Adjusting the cutting positions of the first electrode sheet and the second electrode sheet according to the first set of size parameters and the second set of size parameters includes: Determine a width M3 of the active material region on the first surface of the first electrode sheet according to a difference between L1 and K1; Determine a width M4 of the active material region of the first surface of the second electrode sheet according to the difference between L2 and K2; and By adjusting the slitting position, the difference between the sum of the width M3 and the width M1 and the sum of the width M4 and the width M2 is minimized.

17. The method for manufacturing an electrode sheet for a battery cell according to claim 16, wherein: The adjusting the slitting position so that the difference between the sum of the width M3 and the width M1 and the sum of the width M4 and the width M2 is minimized comprises: Determine the second deviation correction amount according to one quarter of the difference between the sum of the width M3 and the width M1 and the sum of the width M4 and the width M2; The second deviation correction mechanism adjusts the position of the electrode sheet material relative to the slitting and cutting portion of the slitting mechanism by a second deviation correction amount.

18. The method for manufacturing an electrode sheet for a battery cell according to claim 13, wherein: The first surface and the second surface of the electrode sheet material include a first metal membrane area, an active material area, and a second metal membrane area from the first edge to the second edge; The first set of dimensional parameters includes: a distance H from a boundary of the active material area on the first surface close to the first edge to a root of the first electrode tab; A1 and a distance H from the boundary of the active material region on the first surface close to the second edge to the root of the second electrode tab. A2 ; The second set of dimensional parameters includes: a distance H from a boundary of the active material region on the second surface close to the first edge to a root of the first electrode tab; B1 The distance H from the boundary of the active material area on the second surface close to the second edge to the root of the second electrode tab B2 ; The adjusting the cutting positions of the first and second tabs according to the first set of size parameters and the second set of size parameters comprises: adjusting the cutting position so that the distance H A1 and distance H B1 The sum of the values ​​relative to the distance H A2 and distance H B2 minimize the difference between the sum of ; and The first electrode sheet and the second electrode sheet are suitable for being used as negative electrode sheets of a battery cell.

19. The method for manufacturing an electrode sheet for a battery cell according to claim 18, wherein: By adjusting the cutting position, the distance H A1 and distance H B1 The sum of the values ​​relative to the distance H A2 and distance H B2 The difference between the sum of is minimized, including: According to the distance H A1 and distance H B1 The sum of the values ​​relative to the distance H A2 and distance H B2 The first correction amount is determined by taking one quarter of the difference between the sum of the values ​​of ; and The first deviation correction mechanism adjusts the position of the electrode sheet material relative to the tab cutting portion of the die-cutting mechanism by a first deviation correction amount.

20. The method for manufacturing an electrode sheet for a battery cell according to claim 18, wherein: The second set of size parameters also includes: a distance M from the root of the second surface of the first electrode sheet to the slitting cutting track and a distance N from the root of the second surface of the second electrode sheet to the slitting cutting track, The adjusting the cutting position of the first electrode sheet and the second electrode sheet according to the first set of size parameters and the second set of size parameters comprises: The slitting position is adjusted so that the difference between the distance M and the distance N is minimized.

21. The method for manufacturing an electrode sheet for a battery cell according to claim 20, wherein: The method of adjusting the cutting position so as to minimize the difference between the distance M and the distance N comprises: Determine the second deviation correction amount according to half of the difference between the distance M and the distance N; The second deviation correction mechanism adjusts the position of the electrode sheet material relative to the slitting and cutting portion of the slitting mechanism by a second deviation correction amount.

22. The method for manufacturing an electrode sheet for a battery cell according to any one of claims 13 to 21, further comprising: Controlling a first visual detection mechanism to acquire the first image at a first time; Determine the movement time required for the electrode sheet material to move from the position corresponding to the first visual detection mechanism to the position corresponding to the second visual detection mechanism; determining a second time according to the first time and the moving time; The second visual detection mechanism is controlled to acquire the second image at the second time.

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