Device and method for manufacturing electrode plate of battery cell

Abstract

The invention discloses a device and a method for manufacturing an electrode plate of a battery cell. The device comprises a tab die cutting unit; a first visual inspection unit for a first surface side of the electrode sheet; an electrode plate slitting unit; a second visual detection unit for a second surface side opposite to the first surface side of the electrode sheet; the first deviation rectifying unit is positioned at the upstream of the electrode plate slitting unit; and the second deviation rectifying unit is positioned at the downstream of the electrode plate slitting unit.

Description

Technical Field

[0001] The present application relates to the field of batteries, and particularly to an apparatus and a method for manufacturing electrode sheets of battery cells. Background Art

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

[0003] The electrode sheet is an important component of the battery cell. The electrode sheet includes a positive electrode sheet and a negative electrode sheet. Minimizing the manufacturing error of the electrode sheet is beneficial to improving the quality of the battery cell. Summary of the Invention

[0004] In view of the above problems, the present application provides an apparatus and a method for manufacturing electrode sheets of battery cells.

[0005] In a first aspect, the present disclosure provides an apparatus for manufacturing an electrode sheet of a battery cell, characterized in that the apparatus includes: a feeding and traction mechanism for guiding an electrode sheet incoming material to move from upstream to downstream in a processing direction, the electrode sheet incoming material having a first edge and a second edge in a width direction perpendicular to the movement direction of the electrode sheet incoming material; wherein, in the movement direction of the electrode sheet incoming material from upstream to downstream, the apparatus is further sequentially arranged with: a first deviation rectifying mechanism for adjusting the position of the electrode sheet incoming material relative to the tab cutting portion of the die-cutting mechanism in the width direction; a die-cutting mechanism including a tab cutting portion for cutting tabs on the electrode sheet incoming material; a first vision detection mechanism for acquiring a first image of a first surface of the electrode sheet incoming material after tab cutting; a second deviation rectifying mechanism for adjusting the position of the electrode sheet incoming material relative to the cutting portion of the slitting mechanism in the width direction; a slitting mechanism including a cutting portion for slitting the electrode sheet incoming material into a first electrode sheet and a second electrode sheet, the first electrode sheet including the first edge, and the second electrode sheet including the second edge; a second vision detection mechanism for acquiring a second image of a second surface of the first electrode sheet and the second electrode sheet, which is opposite to the first surface; and a control unit for controlling the first deviation rectifying mechanism and the second deviation rectifying mechanism according to the first image and the second image.

[0006] In a second aspect, the present disclosure provides a method for manufacturing an electrode sheet of a battery cell, characterized in that the method includes: cutting a first tab and a second tab at a first edge and a second edge respectively that are opposite to each other in a width direction perpendicular to the moving direction of the incoming electrode sheet; obtaining a first image of a first surface of the incoming electrode sheet after tab cutting to determine a first set of dimensional parameters; cutting the incoming electrode sheet along the width direction of the incoming electrode sheet after tab cutting into a first electrode sheet including the first edge and a second electrode sheet including the second edge; obtaining 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 tab and the second tab according to the first set of dimensional parameters and the second set of dimensional parameters; and adjusting the cutting positions 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.

[0007] Through closed-loop feedback control, the present application adjusts the tab cutting position and the cutting position of the electrode sheet, reducing the manufacturing error of the electrode sheet and being beneficial to improving the quality of the battery cell.

[0008] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically enumerates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0010] Figure 1 is a top view of a device for manufacturing an electrode sheet according to some embodiments of the present application;

[0011] Figure 2 is a schematic diagram of the processing of the incoming electrode sheet according to some embodiments of the present application;

[0012] Figure 3 is a schematic diagram of the processing of the incoming electrode sheet according to some other embodiments of the present application;

[0013] Figure 4 is a flowchart of a method for manufacturing an electrode sheet according to some embodiments of the present application;

[0014] Figure 5 is a schematic structural diagram of a device for manufacturing an electrode sheet according to some embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0017] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two unless otherwise specifically defined.

[0018] Referring to herein "embodiment" means that a specific feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0019] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may indicate: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0020] Please refer to Figure 1 , Figure 1 is a top view of a device for manufacturing electrode sheets according to some embodiments of the present application.

[0021] According to some embodiments, the incoming electrode sheet 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 to move from upstream to downstream in the processing direction. The incoming electrode sheet has a first edge and a second edge in the width direction perpendicular to the movement direction of the incoming electrode sheet.

[0022] According to some embodiments, the device for manufacturing the electrode sheet is further arranged in sequence from upstream to downstream along the moving direction of the incoming electrode sheet: a first deviation rectifying mechanism 102, a die-cutting mechanism 103, a first vision detection mechanism 104, a second deviation rectifying mechanism 105, a slitting mechanism 106, a second vision detection mechanism 107, and a control unit (not shown).

[0023] The incoming material traction mechanism includes a plurality of upper and lower roller pairs driven by motors from upstream to downstream, so that the incoming electrode sheet moves from upstream to downstream in the processing direction.

[0024] The first deviation rectifying mechanism 102 adjusts the position of the incoming electrode sheet relative to the tab cutting part of the die-cutting mechanism in the width direction perpendicular to the moving direction of the incoming electrode sheet.

[0025] The die-cutting mechanism 103 includes a tab cutting part for cutting tabs on the incoming electrode sheet.

[0026] The position of the tab cutting part of the die-cutting mechanism 103 is fixed. The first deviation rectifying mechanism 102 adjusts the position of the incoming electrode sheet relative to the tab cutting part of the die-cutting mechanism. According to the ideal design value, the position of the incoming electrode sheet adjusted by the first deviation rectifying mechanism 102 relative to the tab cutting part of the die-cutting mechanism makes the size of the first tab obtained by cutting consistent with the size of the second tab.

[0027] The first vision detection mechanism 104 acquires a first image of the first surface of the incoming electrode sheet after tab cutting.

[0028] The second deviation rectifying mechanism 105 adjusts the position of the incoming electrode sheet relative to the slitting cutting part of the slitting mechanism in the width direction perpendicular to the moving direction of the incoming electrode sheet.

[0029] The slitting mechanism 106 includes a slitting cutting part for splitting the incoming electrode sheet into a first electrode sheet and a second electrode sheet.

[0030] The second vision detection mechanism 107 acquires a second image of the second surfaces of the first electrode sheet and the second electrode sheet, which are opposite to the first surface.

[0031] The control unit (not shown) controls the first deviation rectifying mechanism 102 and the second deviation rectifying mechanism 105 according to the first image and the second image.

[0032] According to some embodiments, the upper computer (industrial control computer) serves as the control unit.

[0033] According to some embodiments, the control unit calculates various dimensional parameters such as the size of the active material region, the size of the insulating material region, or the size of the tab of the electrode sheet (e.g., the positive electrode sheet) based on the pictures taken by the first vision detection mechanism 104 and the second vision detection mechanism 107. The control unit calculates the correction amounts of the first correction mechanism 102 and the second correction mechanism 105 based on the various dimensional parameters through calculation. And the control unit sends the correction amounts to the first correction mechanism 102 and the second correction mechanism 105 respectively.

[0034] According to some embodiments, the control unit is configured to control the first 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 regions of the first electrode sheet and the second electrode sheet.

[0035] According to some embodiments, the control unit is configured to control the second 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 regions of the first electrode sheet and the second electrode sheet.

[0036] According to some embodiments, the control unit is configured to determine the first correction amount according to the difference between the insulating material regions of the first electrode sheet and the second electrode sheet. The first correction mechanism adjusts the position of the incoming electrode sheet relative to the tab cutting portion of the die-cutting mechanism with the first correction amount.

[0037] According to some embodiments, the control unit is configured to determine the second correction amount according to the difference between the active material regions of the first electrode sheet and the second electrode sheet. The second correction mechanism adjusts the position of the incoming electrode sheet relative to the slitting cutting portion of the slitting mechanism with the second correction amount.

[0038] According to some embodiments, the control unit calculates various dimensional parameters such as the size of the active material region of the electrode sheet (e.g., the negative electrode sheet), the size of the region where the tab overlaps with the active material region (i.e., the partial region of the tab covered with the active material, hereinafter simply referred to as the step region), or the size of the tab based on the pictures taken by the first vision detection mechanism 104 and the second vision detection mechanism 107. The control unit calculates the correction amounts of the first correction mechanism 102 and the second correction mechanism 105 based on the various dimensional parameters through calculation. And the control unit sends the correction amounts to the first correction mechanism 102 and the second correction mechanism 105 respectively.

[0039] According to some embodiments, the control unit is configured to control the first correction mechanism through closed-loop feedback according to the first image and the second image, so as to minimize the difference between the step regions of the first electrode sheet and the second electrode sheet.

[0040] According to some embodiments, the control unit is configured to control the second deviation correction mechanism based on the first image and the second image through closed-loop feedback to minimize the difference between the pole width dimensions of the first electrode tab and the second electrode tab.

[0041] According to some embodiments, the control unit is configured to determine a first deviation correction amount based on the difference between the step regions of the first electrode tab and the second electrode tab. The first deviation correction mechanism adjusts the position of the incoming electrode tab relative to the tab cutting portion of the die-cutting mechanism by the first deviation correction amount.

[0042] According to some embodiments, the control unit is configured to determine a second deviation correction amount based on the difference between the pole width dimensions of the first electrode tab and the second electrode tab. The second deviation correction mechanism adjusts the position of the incoming electrode tab relative to the slitting cutting portion of the slitting mechanism by the second deviation correction amount.

[0043] Please refer to Figure 2 , Figure 2 , which is a schematic diagram of the processing of the incoming electrode tab according to some embodiments of the present application.

[0044] According to some embodiments, for example, the first surface (such as the A surface shown in Figure 2 ) and the second surface (such as the B surface shown in Figure 2 ) of the incoming electrode tab for manufacturing a positive electrode tab include a first metal film region (such as the uppermost region in Figure 2 ), a first insulating material region (such as the hatched region near the first edge side in Figure 2 ), an active material region (such as the hatched region in the middle of Figure 2 ), a second insulating material region (such as the hatched region near the second edge side in Figure 2 ) and a second metal film region (such as the lowermost region in Figure 2 ), from the first edge to the second edge.

[0045] The tab cutting portion includes: a first cutting head for cutting a first tab (such as R1 shown in Figure 2 ) in the first metal film region and the first insulating material region; and a second cutting head for cutting a second tab (such as R2 shown in Figure 2 ) in the second metal film region and the second insulating material region.

[0046] The control unit determines, based on the first image and the second image, the distance K1 (distance from AP1 to AP2) from the root of the first tab on the first surface to the active material region, the distance N1 (distance from BP1 to BP2) from the root of the first tab on the second surface to the active material region, the distance K2 (distance from AP5 to AP4) from the root of the second tab on the first surface to the active material region, and the distance N2 (distance from BP5 to BP4) from the root of the second tab on the second surface to the active material region. And the control unit controls the first rectifying mechanism to adjust the position of the incoming 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.

[0047] According to some embodiments, the control unit determines, based on the first image and the second image, the width M3 of the active material region on the first surface of the first electrode sheet, the width M4 of the active material region on the first surface of the second electrode sheet, the width M1 of the active material region on the second surface of the first electrode sheet, and the width M2 of the active material region on the second surface of the second electrode sheet. And the control unit controls the second rectifying mechanism to adjust the position of the incoming electrode sheet relative to the slitting cutting part 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.

[0048] According to some embodiments, the timing at which the first vision detection mechanism acquires the first image, the timing at which the second vision detection mechanism acquires the second image, and the moving speed of the incoming electrode sheet are set such that the detection points of the first vision detection mechanism and the second vision detection mechanism correspond to opposite surfaces at the same position on the incoming electrode sheet.

[0049] According to some embodiments, an active material and an insulating material are coated on both surface sides (A surface side and B surface side) of a conductive metal foil (such as an aluminum foil). The active material is coated in the middle region of the metal foil. The active material participates in the electrochemical reaction in the battery, and coating the active material in as large an area as possible is beneficial to improving the power supply efficiency of the battery. The insulating material is coated on both sides of the active material region. The active material region is sometimes referred to as the film region. A partial region from the root of the tab to the boundary of the active material region in the insulating material region is sometimes referred to as the AT region. According to some embodiments, the active material appears black, which is significantly different from the color of the insulating material. For example, according to some embodiments, the insulating material contains ceramic powder that appears white. In Figure 2 the central shaded region between AP2 and AP4 represents the active material region, the shaded regions on both sides of the active material region represent the insulating material regions, and the tab regions of the electrode sheet before and after die-cutting are shown on the outermost sides of the insulating material regions.

[0050] As Figure 2As shown, a first tab R1 and a second tab R2 are shown at the upper and lower portions of the electrode sheet, and a slit line for slitting the electrode sheet into a first electrode sheet and a second electrode sheet is shown at the exact middle position in the width direction of the electrode sheet. Figure 2 (A) of Figure 2 shows the first surface side of the electrode sheet (hereinafter simply referred to as the A surface side), Figure 2 (B) of Figure 2 shows the second surface side of the electrode sheet opposite to the first surface side (hereinafter simply referred to as the B surface side). The slit line is shown as P3 in Figure 2 (B) of Figure 2 .

[0051] According to some embodiments, a feeding mechanism for the incoming material is realized by an upper and lower roller pair driven by a motor. The upper and lower roller pair clamps the electrode sheet, and the electrode sheet moves along with the rotational movement of the upper and lower roller pair.

[0052] According to some embodiments, a first tab R1 and a second tab R2 are respectively cut out at the upper and lower portions of the electrode sheet by a die-cutting unit.

[0053] According to some embodiments, the electrode sheet is slit into a first electrode sheet and a second electrode sheet at the exact middle position in the width direction of the electrode sheet by a slitting unit.

[0054] In an ideal situation without manufacturing errors, various parameters of the first electrode sheet and the second electrode sheet are exactly the same. For example, the tab size, the width of the insulating film, and the width of the active material film of the first electrode sheet are exactly the same as those of the second electrode sheet.

[0055] In an ideal situation without manufacturing errors, various parameters of the A surface side of the electrode sheet and the B surface side of the electrode sheet are also exactly the same. For example, the tab size, the width of the insulating film, and the width of the active material film of the A surface side of the electrode sheet are exactly the same as those of the B surface side of the electrode sheet.

[0056] However, in actual production, manufacturing errors objectively and inevitably exist. 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 insulating material regions of the first electrode sheet and the second electrode sheet caused by manufacturing errors, and to minimize the difference between the active material regions of the first electrode sheet and the second electrode sheet.

[0057] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the processing of the incoming electrode sheet for some other embodiments of the present application.

[0058] According to some embodiments, for example, the first surface of the incoming electrode sheet for manufacturing a negative electrode sheet (such as Figure 3The first surface (e.g., the A surface shown) and the second surface (e.g., the B surface shown) include a first metal diaphragm region (e.g., the uppermost region in Figure 3 ) from the first edge to the second edge, an active material region (e.g., the hatched region in the middle of Figure 3 ), and a second metal diaphragm region (e.g., the lowermost region in Figure 3 ). Figure 3

[0059] The tab cutting part includes: a first cutting head for cutting out a first tab (e.g., R1 shown in Figure 3 ) in the first metal diaphragm region and the active material region; and a second cutting head for cutting out a second tab (e.g., R2 shown in Figure 3 ) in the second metal diaphragm region and the active material region.

[0060] The control unit determines the distance H from the first boundary of the active material region on the first surface to the root of the first tab A1 (the distance between AP1 and 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 (the distance between BP1 and 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 (the distance between AP4 and 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 (the distance between BP4 and BP5) according to the first image and the second image, and the control unit controls the first rectifying mechanism to adjust the position of the incoming electrode sheet relative to the first cutting head and the second cutting head in the width direction so that the sum value of the distance H A1 and the distance H B1 is minimized relative to the difference between the sum value of the distance H A2 and the distance H B2 .

[0061] According to some embodiments, the control unit determines the tab width dimension M of the second surface of the first electrode sheet (the distance from the root BP2 of the first tab to the cut line BP3) and the tab width dimension N of the second surface of the second electrode sheet (the distance from the cut line BP3 to the root BP4 of the second tab) according to the second image. And, the control unit controls the second rectifying mechanism to adjust the position of the incoming electrode sheet relative to the slitting cutting part in the width direction so that the difference between the width M and the width N is minimized.

[0062] According to some embodiments, the timing for the first vision detection mechanism to acquire the first image, the timing for the second vision detection mechanism to acquire the second image, and the moving speed of the incoming electrode sheet are set such that the detection points of the first vision detection mechanism and the detection points of the second vision detection mechanism correspond to the opposite two surfaces at the same position on the incoming electrode sheet.

[0063] According to some embodiments, an active material is coated on two surface sides (A surface side and B surface side) of a conductive metal foil (such as a copper foil). The active material is coated on the central region of the metal foil. The active material participates in the electrochemical reaction within the battery, and coating the active material over as large an area as possible is conducive to improving the power supply efficiency of the battery. The active material region is sometimes referred to as the film region. According to some embodiments, the active material appears black, significantly different from the color of the metal foil. In Figure 3 , the central shaded region between AP2 and AP4 represents the active material region, and the central shaded region between BP2 and BP4 also represents the active material region. The tab regions of the electrode sheet before and after die-cutting are shown on both sides.

[0064] As Figure 3 shown, a first tab R1 and a second tab R2 are shown at the upper and lower parts of the electrode sheet, and a cut line that divides the electrode sheet into a first electrode sheet and a second electrode sheet is shown at the exact middle position in the width direction of the electrode sheet. Figure 3 (A) of shows the first surface side (hereinafter simply referred to as the A surface side) of the electrode sheet, Figure 3 (B) of shows the second surface side (hereinafter simply referred to as the B surface side) of the electrode sheet opposite to the first surface side. The cut line is shown as BP3 in Figure 3 (B) of.

[0065] According to some embodiments, a feeding traction mechanism is realized by an upper and lower roller pair driven by a motor. The electrode sheet is clamped by the upper and lower roller pair driven by the motor, and the electrode sheet moves along with the rotational movement of the upper and lower roller pair.

[0066] According to some embodiments, a first tab R1 and a second tab R2 are respectively cut out at the upper and lower parts of the electrode sheet by a die-cutting unit.

[0067] According to some embodiments, the electrode sheet is divided into a first electrode sheet and a second electrode sheet at the exact middle position in the width direction of the electrode sheet by a slitting unit.

[0068] In an ideal situation without manufacturing errors, various parameters of the first electrode sheet and the second electrode sheet are exactly the same. 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 exactly the same.

[0069] In an ideal situation without manufacturing errors, various parameters of the A surface side of the electrode sheet and the B surface side of the electrode sheet are also exactly the same. For example, the tab size and the width of the active material film on the A surface side of the electrode sheet are the same as those on the B surface side of the electrode sheet.

[0070] However, in actual production, manufacturing errors objectively and inevitably exist. 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 regions of the first electrode sheet and the second electrode sheet caused by manufacturing errors, and to minimize the difference between the pole widths of the first electrode sheet and the second electrode sheet.

[0071] Please refer to Figure 4 , Figure 4 which is a schematic flowchart of a method for manufacturing an electrode sheet according to some embodiments of the present application.

[0072] According to some embodiments, on both surface sides of a conductive metal foil (such as an aluminum foil), an active material and an insulating material are coated to pre-prepare the raw material of an electrode sheet (such as a positive electrode sheet). The active material region and the insulating material region are preferably symmetric with respect to the midline in the width direction of the metal foil. The arrangements of the active material regions and the insulating material regions on both surface sides are preferably the same. The active material regions on both surface sides preferably have the same width and are both located in the middle region of the metal foil. The insulating material regions on both surface sides are respectively located on the upper side and the lower side of the active material region, the insulating material regions on both surface sides have the same width, and the upper insulating material region and the lower insulating material region have the same width.

[0073] According to some embodiments, in step S401, the method for manufacturing an electrode sheet of a battery cell of the present application starts.

[0074] According to some embodiments, in step S402, a first pole tab and a second pole tab are respectively cut out at a first edge and a second edge that are opposite to each other in the width direction perpendicular to the moving direction of the incoming electrode sheet.

[0075] According to some embodiments, in step S403, a first image of the first surface of the incoming electrode sheet after pole tab cutting is acquired to determine a first set of dimensional parameters.

[0076] According to some embodiments, in step S404, the incoming electrode sheet is slit along the width direction of the incoming electrode sheet after pole tab cutting into a first electrode sheet including the first edge and a second electrode sheet including the second edge.

[0077] According to some embodiments, in step S405, a second image of the second surface of the first electrode sheet and the second electrode sheet is acquired to determine a second set of dimensional parameters, where the second surface is opposite to the first surface.

[0078] According to some embodiments, in step S406, the cutting positions of the first pole tab and the second pole tab are adjusted according to the first set of dimensional parameters and the second set of dimensional parameters.

[0079] According to some embodiments, at step S407, the slitting positions of the first electrode sheet and the second electrode sheet are adjusted according to the first set of dimensional parameters and the second set of dimensional parameters.

[0080] At step S408, the method for manufacturing the electrode sheet of the battery cell in the present application ends.

[0081] According to some embodiments, the first surface and the second surface of the incoming electrode sheet 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 dimensional parameters includes: the distance K1 from the root of the first tab on the first surface to the active material region and the distance K2 from the root of the second tab on the first surface to the active material region. The second set of dimensional parameters includes: the distance N1 from the root of the first tab on the second surface to the active material region and the distance N2 from the root of the second tab on the second surface to the active material region. Adjusting the cutting positions of the first tab and the second tab according to the first set of dimensional parameters and the second set of dimensional parameters includes: by adjusting the tab cutting positions, minimizing the difference between the sum value of the distance K1 and the distance N1 and the sum value of the distance K2 and the distance N2.

[0082] According to some embodiments, minimizing the difference between the sum value of the distance K1 and the distance N1 and the sum value of the distance K2 and the distance N2 by adjusting the cutting positions includes: determining a first correction amount according to one-fourth of the difference between the sum value of the distance K1 and the distance N1 and the sum value of the distance K2 and the distance N2; and the first correction mechanism adjusts the position of the incoming electrode sheet relative to the tab cutting part of the die-cutting mechanism with the first correction amount.

[0083] According to some embodiments, the second set of dimensional parameters further includes: the width M1 of the active material region on the second surface of the first electrode sheet, the width M2 of the active material region on the second surface of the second electrode sheet, the tab width L1 on the second surface of the first electrode sheet, and the tab width L2 on the second surface of the second electrode sheet. Adjusting the slitting positions 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 includes: determining the width M3 of the active material region on the first surface of the first electrode sheet according to the difference between L1 and K1; determining the width M4 of the active material region on the first surface of the second electrode sheet according to the difference between L2 and K2; and by adjusting the slitting positions of the electrode sheets, minimizing the difference between the sum value of the width M3 and the width M1 and the sum value of the width M4 and the width M2.

[0084] According to some embodiments, by adjusting the slitting position of the electrode sheet, minimizing the difference between the sum of width M3 and width M1 and the sum of width M4 and width M2 includes: determining a second deviation correction amount according to one-fourth of the difference between the sum of width M3 and width M1 and the sum of width M4 and width M2; the second deviation correction mechanism adjusts the position of the incoming electrode sheet relative to the slitting cutting part of the slitting mechanism with the second deviation correction amount.

[0085] According to some embodiments, controlling the first vision detection mechanism to acquire a first image at a first time; determining the moving time required for the incoming electrode sheet to move from the position corresponding to the first vision detection mechanism to the position corresponding to the second vision detection mechanism; determining a second time according to the first time and the moving time; controlling the second vision detection mechanism to acquire a second image at the second time.

[0086] According to some embodiments, using a die-cutting unit to cut out a first tab R1 and a second tab R2 on the upper and lower parts of the electrode sheet respectively. For example, the die-cutting unit can be a laser die-cutting unit or any other suitable die-cutting unit.

[0087] According to some embodiments, on both sides of the electrode sheet ( Figure 2 the A surface side and the B surface side shown), different vision detection units are used for detection respectively.

[0088] For example, using the first vision detection unit 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 tab R1, the position of the boundary line AP2 between the upper insulating material region and the active material region, the position of the boundary line AP4 between the active material region and the lower insulating material region, and the position of the root AP5 of the second tab R2.

[0089] For example, using the second vision detection unit 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 tab R1, the position of the boundary line BP2 between the upper insulating material region and the upper active material region, the position of the slitting line P3 between the first electrode sheet and the second electrode sheet, the position of the boundary line BP4 between the lower active material region and the lower insulating material region, and the position of the root BP5 of the second tab R2.

[0090] According to some embodiments, using a slitting unit to slit the electrode sheet into a first electrode sheet and a second electrode sheet along the middle position in the width direction of the electrode sheet. The slitting unit is, for example, a mechanical slitting tool or any other suitable slitting tool. For example, it is also feasible to use laser slitting for the slitting unit, but the cost of using laser slitting is higher than that of using a mechanical slitting tool.

[0091] According to some embodiments, the first vision detection unit is upstream of the slitting unit, and the second vision detection unit is downstream of the slitting unit. For example, the first vision 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 vision detection unit is represented by P1. Preferably, the electrode sheet moves at a uniform speed V. At timing T2 after a period ΔT, the second vision 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 vision detection unit is represented by P2. The timing T1 when the first vision detection unit performs detection, the timing T2 when the second vision detection unit performs detection, the speed V of the electrode sheet movement, the spatial position P1 of the detection point of the first vision detection unit, and the spatial position P2 of the detection point of the second vision detection unit satisfy (T2 - T1)*V = (P2 - P1). Although it is illustrated that the detection point of the first vision detection unit can be represented by the center point of the field of view area of the first vision detection unit and the detection point of the second vision detection unit can be characterized by the center point of the field of view area of the second vision detection unit, however, the detection point of the first vision detection unit and the detection point of the second vision detection unit can also be characterized by any other predefined points within their fields of view. Such a setting is preferred because such a setting makes the detection position of the first vision detection unit on the electrode sheet and the subsequent detection position of the second vision detection unit on the electrode sheet correspond to the opposite two surfaces of the same position of the electrode sheet.

[0092] The specific manner in which the detection position of the first vision detection unit on the electrode sheet and the subsequent detection position of the second vision detection unit on the electrode sheet correspond to the opposite two surfaces of the same position on the electrode sheet is not limited to the specific manners exemplified above. For the electrode sheet of 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 each tab are preset. The speed at which the electrode sheet moves during the manufacturing process is also preset. The electrode sheet material is provided with marks, and each mark indicates the end of the electrode sheet for the previous battery cell and the start of the electrode sheet for the next battery cell. Based on the detection of the marks and the time and speed of the movement of the electrode sheet since the last mark was detected, it is possible to anticipate the position on the electrode sheet corresponding to the detection point of the first vision detection unit and the position on the electrode sheet corresponding to the detection point of the second vision 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 anticipation, the detection timing of the first vision detection unit and the detection timing of the second vision detection unit can be set such that the detection position of the first vision detection unit on the electrode sheet and the subsequent detection position of the second vision detection unit on the electrode sheet correspond to the opposite two surfaces of the same position on the electrode sheet. For example, by satisfying (T2 - T1)*V = (P2 - P1) as described above, the detection position of the first vision detection unit on the electrode sheet and the subsequent detection position of the second vision detection unit on the electrode sheet correspond to the opposite two surfaces of the same position on the electrode sheet.

[0093] According to some embodiments, two rectifying units are provided to rectify the differences between the insulating material regions of the first electrode sheet and the second electrode sheet and the differences between the active material regions of the first electrode sheet and the second electrode sheet, respectively.

[0094] For example, by using the first deviation correction unit, the difference between the insulating material regions of the first electrode tab and the second electrode tab is minimized through closed-loop feedback control based on the detection results of the first vision detection unit and the second vision detection unit. According to some embodiments, the first deviation correction unit performs closed-loop feedback control with a part (e.g., one-fourth) of the difference amount between the insulating material regions of the first electrode tab and the second electrode tab as the deviation correction amount E to minimize the difference between the insulating material regions of the first electrode tab and the second electrode tab. Taking one-fourth of the difference amount between the insulating material regions of the first electrode tab and the second electrode tab as the deviation correction amount E is only an example. In other embodiments, the deviation correction amount F can also be, for example, 1 / 2 to 1 / 8 (e.g., 1 / 2, 1 / 3, 1 / 4, 1 / 5, 1 / 6, 1 / 7, 1 / 8) of the difference amount between the insulating material regions of the first electrode tab and the second electrode tab.

[0095] For example, by using the second deviation correction unit, the difference between the active material regions of the first electrode tab and the second electrode tab is minimized through closed-loop feedback control based on the detection results of the first vision detection unit and the second vision detection unit. According to some embodiments, the second deviation correction unit performs closed-loop feedback control with a part (e.g., one-fourth) of the difference amount between the active material regions of the first electrode tab and the second electrode tab as the deviation correction amount F to minimize the difference between the active material regions of the first electrode tab and the second electrode tab. Taking one-fourth of the difference amount between the active material regions of the first electrode tab and the second electrode tab as the deviation correction amount F is only an example. In other embodiments, the deviation correction amount F can also be, for example, 1 / 2 to 1 / 8 (e.g., 1 / 2, 1 / 3, 1 / 4, 1 / 5, 1 / 6, 1 / 7, 1 / 8) of the difference amount between the active material regions of the first electrode tab and the second electrode tab.

[0096] According to some embodiments, based on the detection result of the first vision detection unit for the first surface side of the electrode tab, the distance from the root AP1 of the first tab R1 to the root AP5 of the second tab R2 is represented as the electrode tab width L, the distance from the root AP1 of the first tab R1 to the boundary line AP2 between the upper insulating material region and the upper active material region is represented as the AT width K1 on the A surface side, the width M of the active material region is represented as the distance between the boundary line AP2 between the upper insulating material region and the upper active material region and 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 tab R2 to the boundary line AP4 between the active material region and the lower insulating material region is represented as the AT width K2 on the lower A surface side. These values satisfy the relationship of L = K1 + M + K2.

[0097] According to some embodiments, based on the detection result of the second vision detection unit for the second surface side of the electrode sheet, the width L1 of the first electrode sheet is represented as the distance from the root BP1 of the first tab R1 to the tangent line P3 between the first electrode sheet and the second electrode sheet, the width L2 of the second electrode sheet is represented as the distance from the tangent line P3 between the first electrode sheet and the second electrode sheet to the root BP5 of the second tab R2, the width M1 of the upper active material region is represented as the distance from the boundary line BP2 between the upper insulating material region and the upper active material region to the tangent line P3 between the first electrode sheet and the second electrode sheet, the width M2 of the lower active material region is represented as the distance from the tangent line P3 between the first electrode sheet and the second electrode sheet to the boundary line BP4 between the lower active material region and the lower insulating material region, the width N1 from the root BP1 of the first tab R1 to the boundary line BP2 between the upper insulating material region and the upper active material region is represented as the width N1, 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 tab R2 is represented as N2. These values satisfy the relationships of L1 = M1 + N1 and L2 = M2 + N2.

[0098] According to some embodiments, the first rectifying unit is used to perform closed-loop feedback control on the position in the width direction of the electrode sheet based on the rectifying amount E = ((K1 + N1) - (K2 + N2)) / 4. The rectifying amount E = ((K1 + N1) - (K2 + N2)) / 4 represents one-fourth of the difference amount between the insulating material regions of the first electrode sheet and the second electrode sheet.

[0099] According to some embodiments, the second rectifying unit is used to perform closed-loop feedback control on the position in the width direction of the electrode sheet based on the rectifying amount F = ((M1 + M3) - (M2 + M4)) / 4, where M3 = L1 - K1 and M4 = L2 - K2. The rectifying amount F = ((M1 + M3) - (M2 + M4)) / 4 represents one-fourth of the difference amount between the active material regions of the first electrode sheet and the second electrode sheet. Where M3 corresponds to the width of the upper active material region on the A surface side, and M4 corresponds to the width of the lower active material region on the A surface side. Since when the first vision detection unit detects the A surface side of the electrode sheet, the electrode sheet has not been cut into the first electrode sheet and the second electrode sheet, the first vision detection unit cannot detect the width of the upper active material region on the A surface side and the width of the lower active material region on the A surface side. In an ideal situation excluding manufacturing errors, 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 (vertically symmetric). Therefore, the present invention indirectly infers 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.

[0100] According to some embodiments, active materials are coated on both surface sides of a conductive metal foil (such as a copper foil) to prepare the raw material of an electrode sheet (such as a negative electrode sheet) in advance. The active material regions are preferably symmetric with respect to the midline in the width direction of the metal foil. The arrangements of the active material regions on both surface sides are preferably the same. The active material regions on both surface sides preferably have the same width and are both in the middle region of the metal foil.

[0101] According to some embodiments, in step S401, the method for manufacturing an electrode sheet of a battery cell in the present application starts.

[0102] According to some embodiments, in step S402, a first tab and a second tab are respectively cut out at a first edge and a second edge that are opposite to each other in the width direction perpendicular to the moving direction of the incoming electrode sheet.

[0103] According to some embodiments, in step S403, a first image of the first surface of the incoming electrode sheet after tab cutting is acquired to determine a first set of dimension parameters.

[0104] According to some embodiments, in step S404, the incoming electrode sheet is slit along the width direction of the incoming electrode sheet after tab cutting into a first electrode sheet including the first edge and a second electrode sheet including the second edge.

[0105] According to some embodiments, in step S405, a second image of the second surface of the first electrode sheet and the second electrode sheet is acquired to determine a second set of dimension parameters, where the second surface is opposite to the first surface.

[0106] According to some embodiments, in step S406, the cutting positions of the first tab and the second tab are adjusted according to the first set of dimension parameters and the second set of dimension parameters.

[0107] According to some embodiments, in step S407, the slitting positions of the first electrode sheet and the second electrode sheet are adjusted according to the first set of dimension parameters and the second set of dimension parameters.

[0108] In step S408, the method for manufacturing an electrode sheet of a battery cell in the present application ends.

[0109] According to some embodiments, the first surface and the second surface of the incoming electrode sheet include a first metal film region, an active material region, and a second metal film region from the first edge to the second edge. The first set of dimension 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 region A2The second set of dimensional parameters includes: the distance H from the first boundary BP1 of the active material region 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 tab and the second tab according to the first set of dimensional parameters and the second set of dimensional parameters includes: by adjusting the tab cutting positions, minimizing the difference between the sum of the distance HA1 and the distance N1 and the sum of the distance K2 and the distance N2.

[0110] According to some embodiments, by adjusting the cutting positions, making the sum of the distance H A1 and the distance H A2 minimize the difference from the sum of the distance H B1 and the distance H B2 includes: determining a first deviation correction amount according to one-fourth of the difference between the sum of the distance H A1 and the distance H A2 and the sum of the distance H B1 and the distance H B2 ; and the first deviation correction mechanism adjusts the position of the electrode sheet incoming material relative to the tab cutting part of the die-cutting mechanism by the first deviation correction amount.

[0111] According to some embodiments, the second set of dimensional parameters further includes: the distance M from the tab root on the second surface of the first electrode sheet to the slitting cutting trajectory and the distance N from the tab root on the second surface of the second electrode sheet to the slitting cutting trajectory. Adjusting the slitting positions of the first electrode sheet and the second electrode sheet according to the second set of dimensional parameters includes: by adjusting the slitting positions of the electrode sheets, minimizing the difference between the distance M from the tab root on the second surface of the first electrode sheet to the slitting cutting trajectory and the distance N from the tab root on the second surface of the second electrode sheet to the slitting cutting trajectory.

[0112] According to some embodiments, by adjusting the slitting positions of the electrode sheets, minimizing the difference between the distance M from the tab root on the second surface of the first electrode sheet to the slitting cutting trajectory and the distance N from the tab root on the second surface of the second electrode sheet to the slitting cutting trajectory includes: determining a second deviation correction amount according to one-half of the difference between the distance M from the tab root on the second surface of the first electrode sheet to the slitting cutting trajectory and the distance N from the tab root on the second surface of the second electrode sheet to the slitting cutting trajectory; the second deviation correction mechanism adjusts the position of the electrode sheet incoming material relative to the slitting cutting part of the slitting mechanism by the second deviation correction amount.

[0113] According to some embodiments, control the first vision detection mechanism to acquire a first image at a first time; determine the movement time required for the incoming electrode sheet to move from the position corresponding to the first vision detection mechanism to the position corresponding to the second vision detection mechanism; determine a second time based on the first time and the movement time; and control the second vision detection mechanism to acquire a second image at the second time.

[0114] According to some embodiments, use a die-cutting unit to cut out a first tab R1 and a second tab R2 on the upper and lower parts of the electrode sheet respectively. For example, the die-cutting unit can be a laser die-cutting unit or any other suitable die-cutting unit.

[0115] According to some embodiments, on both sides of the electrode sheet ( Figure 3 the A surface side and the B surface side shown), detect using different vision detection units respectively.

[0116] For example, use the first vision detection unit 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 region, the position of the root AP2 of the first tab R1, the position of the root AP4 of the second tab R2, and the position of the second boundary AP5 of the active material region.

[0117] For example, use the second vision detection unit 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 region, the position of the root BP2 of the first tab R1, the position of the tangent line BP3 between the first electrode sheet and the second electrode sheet, the position of the root BP4 of the second tab R2, and the position of the second boundary BP5 of the active material region.

[0118] According to some embodiments, the first vision detection unit is upstream of the slitting unit, and the second vision detection unit is downstream of the slitting unit. For example, the first vision 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 vision detection unit is represented by P1. Preferably, the electrode sheet moves at a uniform speed V. At timing T2 after a period ΔT, the second vision 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 vision detection unit is represented by P2. The timing T1 when the first vision detection unit performs detection, the timing T2 when the second vision detection unit performs detection, the speed V at which the electrode sheet moves, the spatial position P1 of the detection point of the first vision detection unit, and the spatial position P2 of the detection point of the second vision detection unit satisfy (T2 - T1)*V = (P2 - P1). Although it is illustrated that the detection point of the first vision detection unit can be characterized by the center point of the field of view area of the first vision detection unit, and the detection point of the second vision detection unit can be characterized by the center point of the field of view area of the second vision detection unit, however, the detection point of the first vision detection unit and the detection point of the second vision detection unit can also be characterized by any other predefined points within their fields of view. Such a setting is preferred because such a setting makes the detection position of the first vision detection unit on the electrode sheet and the subsequent detection position of the second vision detection unit on the electrode sheet correspond to the opposite two surfaces of the same position of the electrode sheet.

[0119] The specific manner in which the detection position of the first vision detection unit on the electrode sheet corresponds to the detection position of the second vision detection unit subsequently on the electrode sheet on the opposite two surfaces of the same position of the electrode sheet is not limited to the specific manners exemplified above. For the electrode sheet of 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 each tab are preset. The speed at which the electrode sheet moves during the manufacturing process is also preset. The electrode sheet raw material has marks, and each mark indicates the end of the electrode sheet for the previous battery cell and the start of the electrode sheet for the next battery cell. Based on the detection of the marks and the time and speed of the movement of the electrode sheet since the last mark was detected, it is possible to anticipate the position on the electrode sheet corresponding to the detection point of the first vision detection unit and the position on the electrode sheet corresponding to the detection point of the second vision 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 prediction, the detection timing of the first vision detection unit and the detection timing of the second vision detection unit can be set such that the detection position of the first vision detection unit on the electrode sheet corresponds to the detection position of the second vision detection unit subsequently on the electrode sheet on the opposite two surfaces of the same position of the electrode sheet. For example, by satisfying (T2 - T1)*V = (P2 - P1) as described above, the detection position of the first vision detection unit on the electrode sheet corresponds to the detection position of the second vision detection unit subsequently on the electrode sheet on the opposite two surfaces of the same position of the electrode sheet.

[0120] According to some embodiments, the incoming pole piece material is a stacked material. For one electrode sheet, the spacing between every two tabs is equal. The mechanical tape travel distance of the first vision detection unit and the second vision detection unit is denoted as K, the tab spacing is denoted as G, and there are J tabs between the first vision detection unit and the second vision detection unit. The integer part of K / G = J. In such an exemplified case, by staggering the step height value calculated by the first vision detection unit from the step height value calculated by the second vision detection unit by J data, it is possible to ensure that the AB surface deviation correction value is for the opposite two surfaces of the same position of the electrode sheet.

[0121] According to some embodiments, the incoming pole piece is a wound material. For an electrode piece, the size of the tab pitch gradually changes. The designed value of the distance between every two tabs of the electrode piece varies according to the model of the battery cell. Each model of battery cell has a corresponding mark, and each mark indicates the end of the electrode piece for the previous battery cell and the start of the electrode piece for the next battery cell. Starting from each mark, the tabs of the electrode piece can be sequentially numbered as 1, 2, 3, … until the next mark appears. In such an illustrative case, the first vision detection unit and the second vision detection unit can detect the height of the step region corresponding to the respective tab number and / or the tab width dimension.

[0122] According to some embodiments, two rectification units are provided to rectify the difference between the step regions of the first electrode piece and the second electrode piece and the difference between the tab width dimensions of the first electrode piece and the second electrode piece.

[0123] For example, using the first rectification unit, based on the detection results of the first vision detection unit and the second vision detection unit, the difference between the step regions of the first electrode piece and the second electrode piece is minimized through closed-loop feedback control. According to some embodiments, the first rectification unit uses a part (e.g., one-fourth) of the difference amount between the step regions of the first electrode piece and the second electrode piece as the rectification amount Z for closed-loop feedback control to minimize the difference between the step regions of the first electrode piece and the second electrode piece. Using one-fourth of the difference amount between the step regions of the first electrode piece and the second electrode piece as the rectification amount Z is only an example. In other embodiments, the rectification amount Z can also be, for example, 1 / 2 to 1 / 8 (e.g., 1 / 2, 1 / 3, 1 / 4, 1 / 5, 1 / 6, 1 / 7, 1 / 8) of the difference amount between the step regions of the first electrode piece and the second electrode piece.

[0124] For example, by using the second rectification unit, the difference between the pole width dimensions of the first electrode tab and the second electrode tab is minimized through closed-loop feedback control based on the detection results of the first vision detection unit and the second vision detection unit. According to some embodiments, the second rectification unit performs closed-loop feedback control with a part (e.g., one half) of the difference amount between the pole width dimensions of the first electrode tab and the second electrode tab as the rectification amount W to minimize the difference between the pole width dimensions of the first electrode tab and the second electrode tab. Taking one half of the difference amount between the pole width dimensions of the first electrode tab and the second electrode tab as the rectification amount W is merely an example. In other embodiments, the rectification amount W may also be, for example, 1 / 8 to 6 / 8 (e.g., 1 / 8, 2 / 8 = 1 / 4, 3 / 8, 4 / 8 = 1 / 2, 5 / 8, 6 / 8 = 3 / 4) of the difference amount between the pole width dimensions of the first electrode tab and the second electrode tab.

[0125] According to some embodiments, based on the detection result of the first vision detection unit for the first surface side of the electrode tab, the distance from the root AP2 of the first pole ear R1 to the root AP4 of the second pole ear R2 is represented as the electrode tab width L, and the distance from the first boundary of the active material region on the first surface to the root of the first pole ear H A1 (the distance from AP1 to AP2) is represented as the width of the stepped region on the first edge side of the first surface, and the distance from the first boundary of the active material region on the second surface to the root of the first pole ear H B1 (the distance from BP1 to BP2) is represented as the width of the stepped region on the first edge side of the second surface, and the distance from the second boundary of the active material region on the first surface to the root of the second pole ear H A2 (the distance from AP4 to AP5) is represented as the width of the stepped region on the second edge side of the first surface, and the distance from the second boundary of the active material region on the second surface to the root of the second pole ear H B2 (the distance from BP4 to BP5) is represented as the width of the stepped region on the second edge side of the second surface.

[0126] According to some embodiments, based on the detection result of the second vision detection unit for the second surface side of the electrode tab, the width M of the first electrode tab is represented as the distance from the root BP2 of the first pole ear R1 to the tangent line BP3 between the first electrode tab and the second electrode tab, and the width N of the second electrode tab is represented as the distance from the tangent line BP3 between the first electrode tab and the second electrode tab to the root BP4 of the second pole ear R2.

[0127] According to some embodiments, by using the first rectification unit based on the rectification amount Z = ((H A1 +H B1 )-(H A2 +H B2)) / 4 closed-loop feedback controls the position in the width direction of the electrode sheet. The deviation correction amount Z = ((H A1 + H B1 ) - (H A2 + H B2 )) / 4 represents one-fourth of the difference amount between the step regions of the first electrode sheet and the second electrode sheet.

[0128] According to some embodiments, the second deviation correction unit is used to perform closed-loop feedback control on the position in the width direction of the electrode sheet based on the deviation correction amount W = (M - N) / 2. The deviation correction amount W = (M - N) / 2 represents one-half of the difference amount between the pole width dimensions of the first electrode sheet and the second electrode sheet. Since when the first vision detection unit detects the surface side of the electrode sheet A, the electrode sheet has not been cut into the first electrode sheet and the second electrode sheet yet, the first vision detection unit cannot detect the pole width dimensions of the first electrode sheet and the second electrode sheet. In an ideal situation excluding manufacturing errors, the surface sides of the electrode sheet A and B 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).

[0129] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a device for manufacturing an electrode sheet according to some embodiments of the present application.

[0130] According to some embodiments, the device 500 for manufacturing an electrode sheet of the present disclosure includes: a feeding and traction unit 501, a first deviation correction unit 502 and a second deviation correction unit 505, a die-cutting unit 503 and a slitting unit 506, a first vision detection unit 504 and a second vision detection unit 507, and a control unit 508.

[0131] According to some embodiments, relative to the movement direction of the electrode sheet from upstream to downstream, a first deviation correction unit 502, a die-cutting unit 503, a first vision detection unit 504, a second deviation correction unit 505, a slitting unit 506, and a second vision detection unit 507 are arranged in sequence. The movement of the electrode sheet from upstream to downstream is preferably uniform.

[0132] According to some embodiments, the first vision detection unit 504 is used to detect on the first surface side of the electrode sheet (such as the positive electrode sheet): the position of the root AP1 of the first 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 tab R2 on the first surface side. The position of the root AP1 of the first tab R1 corresponds to the extension line of the roots of the tabs in the length direction of the upper electrode sheet. The boundary line between the upper insulating material region and the active material region is denoted as AP2. The boundary line between the active material region and the lower insulating material region is denoted as AP4. The position of the root AP5 of the second tab R2 corresponds to the extension line of the roots of the tabs in the length direction of the lower electrode sheet. At the detection points of the first vision detection unit 504, the electrode sheet has not been slit yet. Therefore, the first vision detection unit 504 cannot detect the slit line.

[0133] According to some embodiments, based on the detection results of the first vision detection unit for the first surface side, for example, 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 concave 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.

[0134] Based on the detection results of the first vision detection unit for the first surface side, the distance from the root AP1 of the first tab R1 to the root AP5 of the second tab R2 (this distance corresponds to the width of the electrode sheet) can be denoted as the electrode sheet width L, the distance from the root AP1 of the first tab R1 to the boundary line AP2 between the upper insulating material region and the upper active material region can be denoted as K1 (i.e., the AT width K1 on the A surface side), the distance between the boundary line AP2 between the upper insulating material region and the upper active material region and the boundary line AP4 between the lower active material region and the lower insulating material region can be denoted as the width M of the active material region (i.e., the film width M on the A surface side), and the distance from the root AP5 of the second tab R2 to the boundary line AP4 between the active material region and the lower insulating material region can be denoted as K2 (i.e., the lower AT width K2 on the A surface side). These values satisfy the relationship of L = K1 + M + K2, that is, the electrode sheet width L = the AT width K1 on the A surface side + the film width M on the A surface side + the lower AT width K2 on the A surface side.

[0135] 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.

[0136] According to some embodiments, a second vision detection unit is used to detect on the second surface side: the position of the root BP1 of the first tab R1 on the second surface side, the position of the boundary line BP2 between the upper insulating material region and the upper active material region on the second surface side, the position P3 of the tangent line P3 between the first electrode tab and the second electrode tab on the second surface side, the position of the boundary line BP4 between the lower active material region and the lower insulating material region on the second surface side, and the position of the root BP5 of the second tab R2 on the second surface side.

[0137] Based on the detection results of the second vision detection unit for the second surface side, the distance from the root BP1 of the first tab R1 to the tangent line P3 between the first electrode tab and the second electrode tab can be expressed as the width L1 of the first electrode tab (i.e., the upper tab width L1 on the B surface side), the distance from the tangent line P3 between the first electrode tab and the second electrode tab to the root BP5 of the second tab R2 can be expressed as the width L2 of the second electrode tab (i.e., the lower tab width L2 on the B surface side), the distance from the boundary line BP2 between the upper insulating material region and the upper active material region to the tangent line P3 between the first electrode tab and the second electrode tab can be expressed as the width M1 of the upper active material region (i.e., the upper film width M1 on the B surface side), the distance from the tangent line P3 between the first electrode tab and the second electrode tab to the boundary line AP4 between the lower active material region and the lower insulating material region can be 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 tab R1 to the boundary line BP2 between the upper insulating material region and the upper active material region can be expressed as the degree 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 tab R2 can be expressed as N2 (i.e., the lower AT width N2 on the B surface side). These values satisfy the relationships L1 = M1 + N1 and L2 = M2 + N2. That is, the upper tab 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 tab 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.

[0138] According to some embodiments, a first rectifying unit is used to perform closed-loop feedback control on the position in the width direction of the electrode tab based on the rectifying amount E = ((K1 + N1) - (K2 + N2)) / 4. The rectifying amount E of the first rectifying unit is obtained by calculating ((K1 + N1) - (K2 + N2)) / 4 based on the detection results of the first vision detection unit and the detection results of the second vision detection unit, and ((K1 + N1) - (K2 + N2)) / 4 represents one-fourth of the difference amount between the insulating material regions of the first electrode tab and the second electrode tab.

[0139] According to some embodiments, the second deviation correction unit is used to perform closed-loop feedback control on the position in the width direction of the electrode sheet based on the deviation correction amount F = ((M1 + M3) - (M2 + M4)) / 4, where M3 = L1 - K1 and M4 = L2 - K2. The deviation correction amount F of the second deviation correction unit is obtained by calculating ((M1 + M3) - (M2 + M4)) / 4 based on the detection results of the first vision detection unit and the second vision detection unit. ((M1 + M3) - (M2 + M4)) / 4 represents one-fourth of the difference amount between the active material regions of the first electrode sheet and the second electrode sheet.

[0140] According to some embodiments, the timing T1 for the first vision detection unit to perform detection, the timing T2 for the second vision detection unit to perform detection, the speed V of the movement of the electrode sheet, the spatial position P1 of the detection point of the first vision detection unit, and the spatial position P2 of the detection point of the second vision detection unit satisfy (T2 - T1) * V = (P2 - P1). Such a setting enables the detection position of the first vision detection unit on the electrode sheet and the subsequent detection position of the second vision detection unit on the electrode sheet to correspond to the opposite two surfaces of the same position of the electrode sheet.

[0141] For the electrode sheet of 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 each pair of tabs are all preset.

[0142] According to some embodiments, two deviation correction units are provided to dynamically correct the position in the width direction of the electrode sheet. The first deviation correction unit among the two deviation correction units is located upstream of the second deviation correction unit. The first deviation correction unit minimizes the difference between the insulating material regions of the first electrode sheet and the second electrode sheet through closed-loop feedback control based on the detection results of the first vision detection unit and the second vision detection unit, so that the difference amount between the insulating material regions of the first electrode sheet and the second electrode sheet is as close to 0 as possible. The second deviation correction unit minimizes the difference between the active material regions of the first electrode sheet and the second electrode sheet through closed-loop feedback control based on the detection results of the first vision detection unit and the second vision detection unit, so that the difference amount between the active material regions of the first electrode sheet and the second electrode sheet is as close to 0 as possible.

[0143] According to some embodiments, the first vision detection unit 504 is used to detect on the first surface side of the electrode sheet (such as the 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 tab R1 on the first surface side, the position of the root AP4 of the second 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 tab R1 corresponds to the extension line of the roots of the tabs in the length direction of the upper electrode sheet. The position of the root AP4 of the second tab R2 corresponds to the extension line of the roots of the tabs in the length direction of the lower electrode sheet. At the detection points of the first vision detection unit 504, the electrode sheet has not been slit. Therefore, the first vision detection unit 504 cannot detect the slit line.

[0144] According to some embodiments, based on the detection results of the first vision detection unit for the first surface side, for example, 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 the position of the bottom of the concave 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.

[0145] Based on the detection results of the first vision detection unit for the first surface side, the distance from the root AP2 of the first tab R1 to the root AP4 of the second tab R2 (this distance corresponds to the width of the electrode sheet) can be expressed as the electrode sheet width L. The active material region covers a partial region of the tab. The partial region of the tab covered with the active material is called the step region. The distance H from the first boundary of the active material region on the first surface to the root of the first tab A1 (the distance from AP1 to AP2) represents the width of the step region on the first edge side on 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 B1 (the distance from BP1 to BP2) represents the width of the step region on the first edge side on 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 A2 (the distance from AP4 to AP5) represents the width of the step region on the second edge side on 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 B2 (the distance from BP4 to BP5) represents the width of the step region on the second edge side on the second surface.

[0146] 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 width of the active material region seen on the first surface side is equal to the width of the active material region seen on the second surface side.

[0147] According to some embodiments, on the second surface side, a second vision detection unit is used to detect: the distance M from the tab root BP2 on the second surface of the first electrode sheet to the slitting cutting trajectory BP3, and the distance N from the tab root BP4 on the second surface of the second electrode sheet to the slitting cutting trajectory BP3. The distance M from the tab root BP2 on the second surface of the first electrode sheet to the slitting cutting trajectory BP3 represents the width of the first electrode sheet. The distance N from the tab root BP4 on the second surface of the second electrode sheet to the slitting cutting trajectory BP3 represents the width of the second electrode sheet.

[0148] Based on the detection results of the second vision detection unit for the second surface side, the distance from the tab root BP2 on the second surface of the first electrode sheet to the slitting cutting trajectory BP3 can be represented as M, and the distance from the tab root BP4 on the second surface of the second electrode sheet to the slitting cutting trajectory BP3 can be represented as N.

[0149] According to some embodiments, a first rectifying unit is used to, based on the rectifying amount Z = ((H A1 +H B1 )-(H A2 +H B2 )) / 4, perform closed-loop feedback control on the position in the width direction of the electrode sheet. The rectifying amount Z of the first rectifying unit is obtained by calculating ((HA1 + HB1)-(HA2 + HB2)) / 4 based on the detection results of the first vision detection unit and the second vision detection unit. ((HA1 + HB1)-(HA2 + HB2)) / 4 represents one-fourth of the difference amount between the step region of the first electrode sheet and the step region of the second electrode sheet.

[0150] According to some embodiments, a second rectifying unit is used to, based on the rectifying amount W = (M - N) / 2, perform closed-loop feedback control on the position in the width direction of the electrode sheet. The rectifying amount W of the second rectifying unit is obtained by calculating (M - N) / 2 based on the detection results of the second vision detection unit. (M - N) / 2 represents one-half of the difference amount between the pole width dimensions of the first electrode sheet and the second electrode sheet.

[0151] According to some embodiments, the timing T1 for detection by the first vision detection unit, the timing T2 for detection by the second vision detection unit, the speed V of movement of the electrode sheet, the spatial position P1 of the detection point of the first vision detection unit, and the spatial position P2 of the detection point of the second vision detection unit satisfy (T2 - T1)*V = (P2 - P1). Such a setting enables the detection position of the first vision detection unit on the electrode sheet and the subsequent detection position of the second vision detection unit on the electrode sheet to correspond to opposite surfaces of the same position of the electrode sheet.

[0152] For the electrode sheet of 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 each tab are all preset.

[0153] According to some embodiments, two deviation rectifying units are provided to dynamically correct the position of the electrode sheet in the width direction. The first deviation rectifying unit among the two deviation rectifying units is located upstream of the second deviation rectifying unit. The first deviation rectifying unit minimizes the difference between the step region of the first electrode sheet and the step region of the second electrode sheet based on the detection results of the first vision detection unit and the second vision detection unit through closed-loop feedback control, so that the difference between the step region of the first electrode sheet and the step region of the second electrode sheet is as close to 0 as possible. The second deviation rectifying unit minimizes the difference between the tab width dimension of the first electrode sheet and the tab width dimension of the second electrode sheet based on the detection result of the second vision detection unit through closed-loop feedback control, so that the difference between the tab width dimension of the first electrode sheet and the tab width dimension of the second electrode sheet is as close to 0 as possible.

[0154] In order to minimize the manufacturing error of the electrode sheet, the present disclosure illustratively describes the above-mentioned various embodiments. The present disclosure minimizes the manufacturing error of the electrode sheet by means of closed-loop feedback control, for example, by minimizing the difference between the insulating material region of the first electrode sheet and the insulating material region of the second electrode sheet or by minimizing the difference between the active material region of the first electrode sheet and the active material region of the second electrode sheet.

[0155] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for manufacturing an electrode sheet for a battery cell, characterized in that: The device comprises: 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, used for acquiring a second image of a second surface of the first electrode sheet and the second electrode sheet, which is 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 step area where the electrode ear of the first electrode sheet overlaps with the active material area and the step area where the electrode ear of the second electrode sheet overlaps with the active material area; 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 the distance H 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 according to the first image and the second image. A1 , 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 , a distance H 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 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 ,as well as 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 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 .

11. The device for manufacturing an electrode sheet for a battery cell according to claim 7, characterized in that: 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, characterized in that: 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 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 material.

13. A method for manufacturing an electrode sheet for a battery cell, applied to the device for manufacturing an electrode sheet for a battery cell according to claim 1, characterized in that: The method comprises: 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 dimensional parameters and the second set of dimensional parameters; and 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 size parameters includes: a distance H from a boundary of the active material area 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, characterized in that: 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, characterized in that: 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 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 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, characterized in that: 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, characterized in that: Also includes: Controlling a first visual detection mechanism to acquire the first image at a first time; Determine the moving 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.

Images