Marking device, pole piece production system and pole piece marking method

Abstract

The application provides a marking device, a pole piece production system and a pole piece marking method, and belongs to the field of battery production equipment. The marking device comprises a roller body and a marking part. The roller body is arranged on one side of the pole piece with an active material layer along the thickness direction of the pole piece, and the axis of the roller body extends along the width direction of the pole piece. The marking part is arranged on the roller body and protrudes from the outer peripheral surface of the roller body. The marking part extends along the axis direction of the roller body and is configured to press the surface of the pole piece when the roller body rotates to form a notch on the pole piece. The marking device with this structure can make the marking speed of the pole piece related to the rotating speed of the roller body, thereby facilitating the improvement and optimization of the marking efficiency of the pole piece. On the other hand, the pole piece does not need to be marked by laser marking technology, thereby relieving the phenomenon that the pole piece forms a heat affected zone after being ablated by laser, reducing the damage to the pole piece during the marking process, and improving the production quality of the pole piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery production equipment, in particular to a marking device, a pole piece production system and a pole piece marking method. BACKGROUND

[0002] Batteries have the outstanding advantages of high energy density, small environmental pollution, large power density, long service life, wide application range, and small self-discharge coefficient, and are an important part of current new energy development. The battery cell of a battery is assembled into an electrode assembly (wound cell or laminated cell) by winding or laminating the positive pole piece, the negative pole piece and the separator film, then is loaded into a shell, a cover is covered, and finally the electrolyte is injected to obtain the battery.

[0003] Because the laminated cell has the advantages of high rate and high energy density compared with the wound cell, and the laminated cell can also be made into various special-shaped batteries according to different needs, the laminated cell is generally used to make batteries in the industry. The traditional laminating equipment usually uses laser marking technology to mark the pole piece, that is, the high-temperature ablation of the active material layer on one side of the pole piece is generated by the high concentration of laser beam, so as to form a notch on one side of the pole piece to facilitate the laminating of the pole piece. However, this marking method is prone to form a heat-affected zone in the active material layer on one side of the pole piece after being ablated by laser, and is prone to damage the pole piece, thereby causing poor production quality of the pole piece. SUMMARY

[0004] The present application provides a marking device, a pole piece production system and a pole piece marking method, which can effectively improve the production quality and production efficiency of the pole piece.

[0005] In a first aspect, the present application provides a marking device for marking a pole piece, the pole piece comprising a current collector and an active material layer, at least one side of the current collector being provided with the active material layer along the thickness direction of the pole piece, the marking device comprising a roller body and a marking portion; the roller body is arranged on the side of the pole piece with the active material layer along the thickness direction of the pole piece, and the axis of the roller body extends along the width direction of the pole piece; the marking portion is arranged on the roller body and protrudes from the outer peripheral surface of the roller body, the marking portion extends along the axis direction of the roller body, and the marking portion is configured to press the surface of the pole piece when the roller body rotates to form a notch on the pole piece.

[0006] In the technical scheme, the roller body is arranged on the side of the polar sheet with the active material layer along the thickness direction of the polar sheet, and the roller body is provided with the marking part extending along the width direction of the polar sheet, so that the roller body can drive the marking part to extrude the surface of the polar sheet during rotation, thereby forming the notch on the position of the active material layer on one side of the polar sheet to meet the stacking requirement. The notch device with the structure can associate the notch speed of the polar sheet with the rotation speed of the roller body, thereby facilitating the improvement and optimization of the notch efficiency of the polar sheet, and on the other hand, the notch device does not need to use the laser notch technology to notch the polar sheet, thereby relieving the phenomenon that the polar sheet forms a heat affected zone after being ablated by the laser, reducing the damage of the polar sheet during the notch process, and thereby effectively improving the production quality of the polar sheet.

[0007] In some embodiments, the marking part is configured to extrude the active material layer when the roller body rotates, to reduce or remove the active material layer at the extruded position and form the notch.

[0008] In the technical scheme, the extrusion of the active material layer by the marking part can remove or reduce the active material layer at the corresponding position, thereby forming the notch on one side of the polar sheet to facilitate the stacking process of the polar sheet, and thereby effectively relieving the damage of the polar sheet during the notch process.

[0009] In some embodiments, the marking part is detachably connected to the roller body.

[0010] In the technical scheme, the marking part is detachably connected to the roller body, thereby achieving the quick disassembly and replacement of the marking part, facilitating the maintenance of the marking part during the later use, and facilitating the replacement of different types of marking parts to meet the notch requirements of different types of polar sheets, thereby facilitating the improvement of the application range of the notch device.

[0011] In some embodiments, the outer periphery of the roller body is provided with a mounting groove extending along the axis direction of the roller body; and the notch device further comprises a mounting part connected to the marking part, and the mounting part is clamped in the mounting groove.

[0012] In the technical scheme, the mounting groove extending along the axis direction of the roller body is arranged on the outer periphery of the roller body, and the mounting part is connected to the marking part, so that the mounting part can be detachably connected to the roller body when clamped in the mounting groove. The notch device with the structure is convenient to manufacture and install, and has high structural stability.

[0013] In some embodiments, the width of the marking part in the circumferential direction of the roller body gradually decreases in the direction away from the roller body along the radial direction of the roller body.

[0014] In the technical scheme, the width of the marking part in the circumferential direction of the roller body is gradually reduced from the radial direction of the roller body, so that the marking part is pressed into the active material layer of the pole piece, thereby facilitating the marking part to form the notch on one side of the pole piece, and improving the marking efficiency of the marking device on the pole piece.

[0015] In some embodiments, the marking part is arc-shaped or planar away from one end of the roller body in the radial direction of the roller body.

[0016] In the technical scheme, the end of the marking part for extruding the active material layer of the pole piece is arc-shaped or planar, which facilitates to reduce the damage of the current collector of the pole piece caused by the marking part when extruding the active material layer of the pole piece, thereby effectively improving the production quality of the pole piece.

[0017] In some embodiments, the size of the marking part protruding from the outer circumferential surface of the roller body is d1, the thickness of the active material layer is d2, and the sum of the thickness of the active material layer and the thickness of the current collector is d3, and d2≤d1≤d3 is satisfied.

[0018] In the technical scheme, the size of the marking part protruding from the outer circumferential surface of the roller body is greater than or equal to the thickness of the active material layer, and less than or equal to the sum of the thickness of the active material layer and the thickness of the current collector, thereby on the one hand, the phenomenon that the marking effect of the pole piece is poor due to the size of the marking part protruding from the outer circumferential surface of the roller body being too small can be reduced, and on the other hand, the risk that the current collector of the pole piece is damaged due to the size of the marking part protruding from the outer circumferential surface of the roller body being too large can be reduced.

[0019] In some embodiments, the active material layer is arranged on both sides of the current collector in the thickness direction of the pole piece; the marking device comprises two roller bodies and two marking parts; the two roller bodies are arranged on both sides of the pole piece in the thickness direction of the pole piece; and the two marking parts are arranged on the two roller bodies, respectively, to form the notch on both sides of the pole piece.

[0020] In the technical scheme, the roller body is arranged on both sides of the pole piece, and the marking part is arranged corresponding to each roller body, thereby meeting the demand of marking on both sides of the pole piece, and optimizing the production rhythm of the pole piece in the marking process, which is conducive to improving the marking efficiency and production efficiency of the pole piece.

[0021] In some embodiments, the two roller bodies are arranged at intervals in the conveying direction of the pole piece.

[0022] In the technical scheme, the two roller bodies of the marking device are arranged along the conveying direction of the pole piece, so that the interference between the two roller bodies can be effectively reduced, and the installation and adjustment of the roller bodies and the marking part can be facilitated.

[0023] In some embodiments, the two roller bodies are oppositely arranged along the thickness direction of the pole piece.

[0024] In the technical scheme, the two roller bodies are oppositely arranged along the thickness direction of the pole piece, so that the two roller bodies can cooperate with each other to support the pole piece, thereby facilitating the marking device to mark the pole piece on both sides of the pole piece and improving the marking quality of the pole piece.

[0025] In some embodiments, the two marking parts are symmetrically arranged on both sides of the pole piece along the thickness direction of the pole piece, so as to form symmetrically arranged marks on both sides of the pole piece.

[0026] In the technical scheme, the two marking parts are symmetrically arranged on both sides of the pole piece along the thickness direction of the pole piece, so that the marking device can form two symmetrically arranged marks on both sides of the pole piece to meet the marking requirement of the pole piece.

[0027] In some embodiments, along the radial direction of the roller body, the roller body has an abutting position opposite to the marking part, when the abutting position of one roller body abuts against one side of the pole piece, the marking part on the other roller body is pressed against the other side of the pole piece to form two marks arranged in a staggered manner on both sides of the pole piece.

[0028] In the technical scheme, when the abutting position of the roller body on one side of the pole piece abuts against the pole piece, the marking part on the roller body on the other side of the pole piece is pressed against the pole piece, so that the rotation angles of the two marking parts are different by 180 degrees, thereby forming two marks arranged in a staggered manner on both sides of the pole piece to meet the marking requirement of the pole piece.

[0029] In some embodiments, the marking device further comprises a support, the support is arranged corresponding to the roller body, the support and the roller body are oppositely arranged on both sides of the pole piece along the thickness direction, and the support is used for supporting the pole piece.

[0030] In the technical scheme, one support is arranged corresponding to each roller body, and the support and the roller body are oppositely arranged along the thickness direction of the pole piece, so that the support can play a better supporting role during the pressing and marking of the pole piece by the marking part, thereby improving the marking quality of the pole piece and reducing the risk of breaking of the pole piece.

[0031] In a second aspect, the embodiments of the present application further provide an electrode sheet production system, comprising a conveying device and the marking device described above; the conveying device is used to convey the electrode sheet.

[0032] In some embodiments, the electrode sheet production system further comprises a dust removal device; the dust removal device is arranged downstream of the marking device along the conveying direction of the electrode sheet, and the dust removal device is used to remove dust from the side of the electrode sheet on which the roller body is arranged.

[0033] In the technical solution described above, the electrode sheet production system is further provided with a dust removal device, and the dust removal device is arranged downstream of the marking device, so that the dust removal device can remove dust from the side of the electrode sheet on which the marks are arranged, thereby reducing the dust attached to the electrode sheet after the marking is completed, and thus facilitating the improvement of the production quality of the electrode sheet.

[0034] In some embodiments, the dust removal device comprises a supporting roller and an ultrasonic dust removal device; the ultrasonic dust removal device and the supporting roller are arranged on opposite sides of the electrode sheet along the thickness direction of the electrode sheet, and the ultrasonic dust removal device is arranged on the same side of the electrode sheet as the roller body.

[0035] In the technical solution described above, the dust removal device is provided with a supporting roller and an ultrasonic dust removal device, the supporting roller is arranged on one side of the electrode sheet, and the ultrasonic dust removal device is arranged on the other side of the electrode sheet corresponding to the position of the supporting roller, so that the ultrasonic dust removal device can remove dust from the side of the electrode sheet on which the marks are arranged. The dust removal device with this structure can improve the dust removal effect on the electrode sheet and reduce the damage to the electrode sheet caused by the dust removal device during the dust removal process.

[0036] In some embodiments, the electrode sheet production system comprises two dust removal devices; the two dust removal devices are arranged at intervals along the conveying direction of the electrode sheet, and the ultrasonic dust removal devices of the two dust removal devices are respectively arranged on the two sides of the electrode sheet along the thickness direction of the electrode sheet.

[0037] In the technical solution described above, two dust removal devices are arranged downstream of the marking device along the conveying direction of the electrode sheet in sequence, and the ultrasonic dust removal devices of the two dust removal devices are respectively arranged on the two sides of the electrode sheet, so that the two sides of the electrode sheet can be removed, which is conducive to further improving the dust removal quality of the electrode sheet.

[0038] In some embodiments, the pole piece production system further comprises a marking device and a detection device; the marking device is arranged upstream of the marking device along the conveying direction of the pole piece, and is configured to form a mark at the position of the pole piece to be marked; the detection device is arranged between the marking device and the marking device along the conveying direction of the pole piece, and is configured to detect the mark and generate a control signal, and the marking device is configured to form the notch at the position to be marked according to the control signal.

[0039] In the above technical solution, the pole piece production system is further provided with a marking device and a detection device. The marking device can mark the position of the pole piece to be marked, and the detection device can detect and feedback, so that the roller body can drive the marking part to form a notch at the position of the pole piece to be marked, thereby effectively improving the marking precision of the pole piece and improving the production quality of the pole piece.

[0040] In some embodiments, the marking device comprises a hole forming mechanism; the hole forming mechanism is configured to form a mark hole at the position of the pole piece to be marked, and the detection device is configured to detect the mark hole and generate the control signal.

[0041] In the above technical solution, the hole forming mechanism is used as the marking device to form a mark hole at the position of the pole piece to be marked, thereby marking the position of the pole piece to be marked. The marking device of this structure is simple in structure, easy to implement, and conducive to the detection of the mark hole formed at the position of the pole piece to be marked by the detection device, thereby effectively improving the detection accuracy of the detection device.

[0042] In a third aspect, the embodiments of the present application also provide a pole piece marking method, comprising: providing a pole piece, the pole piece comprising a current collector and an active material layer, at least one side of the current collector being provided with the active material layer along the thickness direction of the pole piece; providing a marking device, the marking device comprising a roller body and a marking part, the marking part being arranged on the roller body and protruding from the outer peripheral surface of the roller body, the marking part extending along the axis of the roller body; rotating the roller body to drive the marking part to press the surface of the pole piece, so as to form a notch extending along the width direction of the pole piece on the active material layer. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0044] Figure 1A structure schematic diagram of the electrode sheet production system provided for some embodiments of the present application is shown in the figure;

[0045] Figure 2 A front view of the electrode sheet production system provided for some embodiments of the present application is shown in the figure;

[0046] Figure 3 A sectional view of the electrode sheet provided for some embodiments of the present application is shown in the figure;

[0047] Figure 4 A structure schematic diagram of the marking device provided for some embodiments of the present application is shown in the figure; Figure 1 A partial enlarged view of position A of the electrode sheet production system shown in the figure;

[0048] Figure 5 A structure schematic diagram of the marking device provided for some embodiments of the present application is shown in the figure;

[0049] Figure 6 A connection schematic diagram of the roller body and the marking part provided for some embodiments of the present application is shown in the figure;

[0050] Figure 7 A structure schematic diagram of the marking device provided for some embodiments of the present application is shown in the figure;

[0051] Figure 8 A structure schematic diagram of the marking device provided for some embodiments of the present application is shown in the figure;

[0052] Figure 9 A flow schematic diagram of the electrode sheet marking method provided for some embodiments of the present application is shown in the figure.

[0053] Figure legend: 100-electrode sheet production system; 10-marking device; 11-roller body; 111-mounting groove; 12-marking part; 13-mounting part; 14-supporting member; 20-electrode sheet; 21-current collector; 22-active material layer; 23-scribe; 30-dust removal device; 31-supporting roller; 32-ultrasonic dust remover; 40-marking device; 41-hole forming mechanism; 42-waste box; X-thickness direction of the electrode sheet; Y-conveying direction of the electrode sheet; Z-width direction of the electrode sheet. DETAILED DESCRIPTION

[0054] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0056] Reference throughout this application to "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments.

[0057] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0058] The term "and / or" in the application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0059] In the embodiments of the application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0060] "Multiple" appearing in the application means more than two (including two).

[0061] The battery cell includes a shell, an electrode assembly, and an electrolyte, the shell being used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector, and the part of the positive current collector without the positive active material layer being coated as a positive electrode tab to realize the input or output of electric energy of the positive electrode tab through the positive electrode tab. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector, and the part of the negative current collector without the negative active material layer being coated as a negative electrode tab to realize the input or output of electric energy of the negative electrode tab through the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that no fuse occurs through a large current, the number of the positive electrode tabs is multiple and stacked together, and the number of the negative electrode tabs is multiple and stacked together.

[0062] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure, and the embodiments of the present application are not limited thereto.

[0063] It should be noted that the electrode assembly is a component in which an electrochemical reaction occurs in the battery cell. The electrode assembly can include a positive electrode tab, a separator, and a negative electrode tab. The electrode assembly can be a winding type structure formed by winding the positive electrode tab, the separator, and the negative electrode tab to form a winding cell, or a laminated type structure formed by laminating the positive electrode tab, the separator, and the negative electrode tab to form a laminated cell.

[0064] Since the laminated cell has the advantages of high rate and high energy density compared with the winding cell, and the laminated cell can also be made into various special-shaped batteries according to different needs, the laminated cell is generally used to make batteries in the industry.

[0065] The inventor found that in the production process of the electrode assembly of the laminated type, the conventional laminating equipment usually adopts the method of cutting the pole piece by the pole piece cutting machine for laminating, which can meet the laminating requirements, but in the process of cutting the pole piece, burrs are prone to occur on the cutting edge of the pole piece, which leads to poor production quality of the pole piece, and the risk of damage of the isolation film by the burr of the pole piece, and the production efficiency of the battery monomer is low due to the need for single cutting of the pole piece. In order to solve the risk of burr on the cutting edge of the pole piece, in the prior art, marks are made on the active material layer on both sides of the pole piece (i.e. forming a mark line on the surface of the pole piece), so as to eliminate the cutting of the pole piece, thereby facilitating the stacking of the pole piece. The existing pole piece marking usually adopts laser marking technology, that is, the high temperature ablation of the active material layer on one side of the pole piece by the high concentration of laser beam, thereby forming a mark line on one side of the pole piece. However, this marking method has the following problems: on the one hand, the active material layer on one side of the pole piece will form a heat affected zone after being ablated by laser, and the pole piece is prone to be damaged, thereby adversely affecting the production quality of the pole piece; on the other hand, when the moving speed of the pole piece needs to be increased, the ablation of the active material layer on one side of the pole piece by the laser beam is prone to be incomplete, thereby affecting the production efficiency of the pole piece, and the production rhythm of the pole piece cannot be improved and optimized.

[0066] Based on the above considerations, in order to solve the problems of poor production quality and low production efficiency of the pole piece, the inventor has designed a marking device after deep research, which comprises a roller body and a marking part. The roller body is arranged on the side of the pole piece with the active material layer along the thickness direction of the pole piece, and the axis of the roller body extends along the width direction of the pole piece. The marking part is arranged on the roller body and protrudes from the outer peripheral surface of the roller body. The marking part extends along the axis direction of the roller body and is configured to press the surface of the pole piece when the roller body rotates to form a notch on the pole piece.

[0067] In the marking device with the above structure, the roller body is arranged on the side of the pole piece with the active material layer along the thickness direction of the pole piece, and the marking part extending along the width direction of the pole piece is arranged on the roller body. The roller body can drive the marking part to press the surface of the pole piece during rotation, thereby forming a notch on the position of the active material layer on one side of the pole piece, which meets the laminating requirements. The marking device with the above structure has the following advantages: on the one hand, the marking speed of the pole piece is related to the rotating speed of the roller body, which is conducive to improving and optimizing the marking efficiency of the pole piece; on the other hand, the pole piece does not need to be marked by laser marking technology, which can alleviate the phenomenon of forming a heat affected zone on the pole piece after being ablated by laser, and reduce the damage of the pole piece during marking, thereby effectively improving the production quality of the pole piece.

[0068] The embodiment of the present application provides a pole piece production system, which can improve the problem that the existing pole piece production system is easy to damage the pole piece in the process of marking the pole piece, thereby causing poor production quality of the pole piece, and low marking efficiency of the pole piece, and is not conducive to improving and optimizing the production rhythm of the pole piece. The specific structure of the pole piece production system is described in detail below with reference to the drawings.

[0069] Please refer to Figure 1 and Figure 2 , Figure 1 The structure schematic diagram of the pole piece production system 100 provided by some embodiments of the present application is shown in Figure 2 The front view of the pole piece production system 100 provided by some embodiments of the present application is shown in. The pole piece production system 100 provided by the embodiment of the present application comprises a marking device 10 and a conveying device. The conveying device is used for conveying a pole piece 20, and the marking device 10 is used for marking the pole piece 20.

[0070] In some embodiments, as shown in Figure 3 , Figure 3 The cross-sectional view of the pole piece 20 provided by some embodiments of the present application is shown in. The pole piece 20 comprises a current collector 21 and an active material layer 22. Along the thickness direction X of the pole piece, at least one side of the current collector 21 is provided with the active material layer 22.

[0071] For example, in Figure 3 , along the thickness direction X of the pole piece, both sides of the current collector 21 are coated with the active material layer 22.

[0072] According to some embodiments of the present application, refer to Figure 1 and Figure 2 , and further refer to Figure 4 and Figure 5 , Figure 4 The partial enlarged view of A of the pole piece production system 100 shown in Figure 1 is shown in Figure 5 The structure schematic diagram of the marking device 10 provided by some embodiments of the present application is shown in. The marking device 10 provided by the embodiment of the present application comprises a roller body 11 and a marking part 12. The roller body 11 is arranged on one side of the pole piece 20 with the active material layer 22 along the thickness direction X of the pole piece, and the axis of the roller body 11 extends along the width direction Z of the pole piece. The marking part 12 is arranged on the roller body 11 and protrudes from the outer peripheral surface of the roller body 11. The marking part 12 extends along the axis direction of the roller body 11. The marking part 12 is configured to press the surface of the pole piece 20 when the roller body 11 rotates, so as to form a notch 23 on the pole piece 20.

[0073] The axis of the roller body 11 extends along the width direction Z of the pole piece, that is, the roller body 11 is arranged along the width direction Z of the pole piece, and the rotation axis of the roller body 11 extends along the width direction Z of the pole piece. The marking portion 12 extends along the axis direction of the roller body 11, that is, the length direction of the marking portion 12 is the width direction Z of the pole piece, so that the marking portion 12 can press on the active material layer 22 on one side of the pole piece 20 when following the rotation of the roller body 11, thereby removing the active material of the active material layer 22 at this position to form a notch 23 on one side of the pole piece 20.

[0074] Optionally, the marking portion 12 protrudes from the outer peripheral surface of the roller body 11, that is, the outer peripheral surface of the roller body 11 is provided with the marking portion 12 for extruding the pole piece 20. The marking portion 12 and the roller body 11 can be an integral structure or a split structure. When the marking portion 12 and the roller body 11 are an integral structure, the marking portion 12 and the roller body 11 can be made by casting or milling, etc. When the marking portion 12 and the roller body 11 are a split structure, the marking portion 12 can be connected to the roller body 11 by welding, bolting, clamping or bonding, etc.

[0075] It should be noted that, in Figure 5 each roller body 11 is provided with one marking portion 12. Of course, in other embodiments, each roller body 11 can also be provided with multiple marking portions 12, and the multiple marking portions 12 are arranged at intervals along the circumferential direction of the roller body 11 to improve the marking efficiency of the pole piece 20.

[0076] By arranging the roller body 11 on the side of the pole piece 20 having the active material layer 22 along the thickness direction X of the pole piece, and arranging the marking portion 12 extending along the width direction Z of the pole piece on the roller body 11, the roller body 11 can drive the marking portion 12 to extrude the surface of the pole piece 20 during rotation, thereby forming a notch 23 at the position of the active material layer 22 on one side of the pole piece 20 that is extruded, to meet the stacking requirements. The marking device 10 with this structure can on the one hand make the marking speed of the pole piece 20 related to the rotation speed of the roller body 11, thereby facilitating the improvement and optimization of the marking efficiency of the pole piece 20, and on the other hand, without the need for laser marking technology to mark the pole piece 20, thereby being able to alleviate the phenomenon of forming a heat affected zone on the pole piece 20 after being ablated by laser, and being beneficial to reducing the damage to the pole piece 20 during marking, thereby being able to effectively improve the production quality of the pole piece 20.

[0077] According to some embodiments of the present application, the marking portion 12 is configured to extrude the active material layer 22 when following the rotation of the roller body 11, so as to reduce or remove the active material layer 22 at the extruded position and form a notch 23.

[0078] The active material layer 22 at the pressed part is reduced or removed, and the notch 23 is formed. The roller body 11 can drive the notch forming part 12 to rotate, so that the notch forming part 12 presses the active material layer 22 on one side of the pole piece 20, thereby removing or reducing the active material layer 22 at the position to form the notch 23.

[0079] The active material layer 22 at the pressed part is reduced or removed, and the notch 23 is formed. The roller body 11 can drive the notch forming part 12 to rotate, so that the notch forming part 12 presses the active material layer 22 on one side of the pole piece 20, thereby removing or reducing the active material layer 22 at the position to form the notch 23.

[0080] According to some embodiments of the present application, the notch forming part 12 is detachably connected to the roller body 11.

[0081] The notch forming part 12 can be detachably connected to the roller body 11 in various ways, for example, the notch forming part 12 can be detachably connected to the roller body 11 by bolting or clamping.

[0082] By detachably connecting the notch forming part 12 to the roller body 11, the notch forming part 12 can be quickly detached and replaced, which is conducive to the maintenance of the notch forming part 12 during later use, and different models of notch forming parts 12 can be replaced to meet the notch forming requirements of different models of pole pieces 20, such as forming notches 23 of different widths on the pole piece 20, thereby improving the application range of the notch forming device 10.

[0083] In some embodiments, referring to Figure 5 , and further referring to Figure 6 , Figure 6 The connection between the roller body 11 and the notch forming part 12 is shown in the schematic diagram provided by some embodiments of the present application. The outer circumferential surface of the roller body 11 is provided with a mounting groove 111 extending along the axial direction of the roller body 11. The notch forming device 10 further comprises a mounting part 13 connected to the notch forming part 12, and the mounting part 13 is clamped in the mounting groove 111.

[0084] In the above description, the mounting part 13 is clamped in the mounting groove 111 of the roller body 11, and the notch forming part 12 is connected to the mounting part 13 on the side away from the groove bottom wall of the mounting groove 111 along the radial direction of the roller body 11, so that the notch forming part 12 can protrude from the outer circumferential surface of the roller body 11, and the detachable connection between the notch forming part 12 and the roller body 11 is achieved. For example, Figure 6 , the notch forming part 12 and the mounting part 13 are of an integrated structure, of course, in other embodiments, the notch forming part 12 and the mounting part 13 are of a split structure, and the notch forming part 12 is connected to the mounting part 13 by welding or bonding.

[0085] The marking device 10 has the structure that the outer circumferential surface of the roller body 11 is provided with the mounting groove 111 extending along the axial direction of the roller body 11, and the marking part 12 is connected with the mounting part 13, so that the marking part 12 is detachably connected with the roller body 11 when the mounting part 13 is clamped in the mounting groove 111. The structure of the marking device 10 is convenient for manufacturing and mounting, and has high structural stability.

[0086] According to some embodiments of the present application, as shown in Figure 5 and Figure 6 , the width of the marking part 12 in the circumferential direction of the roller body 11 gradually decreases in the direction away from the roller body 11 along the radial direction of the roller body 11.

[0087] The width of the marking part 12 in the circumferential direction of the roller body 11 is the width of the marking part 12 in the conveying direction Y of the pole piece 20 when the marking part 12 is pressed on one side of the pole piece 20.

[0088] For example, the width of the marking part 12 in the circumferential direction of the roller body 11 gradually decreases, and the cross section of the marking part 12 can be trapezoidal or arc-shaped, which is not limited in the embodiments of the present application.

[0089] By setting the width of the marking part 12 in the circumferential direction of the roller body 11 to gradually decrease outwardly along the radial direction of the roller body 11, the marking part 12 is pressed into the active material layer 22 of the pole piece 20, thereby facilitating the marking part 12 to form the notch 23 on one side of the pole piece 20, and improving the marking efficiency of the marking device 10 on the pole piece 20.

[0090] According to some embodiments of the present application, as shown in Figure 6 , the end of the marking part 12 away from the roller body 11 is arc-shaped or planar along the radial direction of the roller body 11.

[0091] The end of the marking part 12 away from the roller body 11 is arc-shaped or planar, that is, one end of the marking part 12 protruding from the outer circumferential surface of the roller body 11 is arc-shaped or planar. For example, in Figure 6 , the end of the marking part 12 away from the roller body 11 is planar. Of course, in other embodiments, the end of the marking part 12 away from the roller body 11 can also be arc-shaped.

[0092] By setting the end of the marking part 12 away from the roller body 11 to be arc-shaped or planar along the radial direction of the roller body 11, that is, setting the end of the marking part 12 for pressing the active material layer 22 of the pole piece 20 to be arc-shaped or planar, this structure is beneficial to reduce the damage of the marking part 12 to the current collector 21 of the pole piece 20 when pressing the active material layer 22 of the pole piece 20, thereby effectively improving the production quality of the pole piece 20.

[0093] According to some embodiments of the present application, as shown in Figure 3 andFigure 6 As shown, the size of the indentation portion 12 protruding from the outer circumferential surface of the roller body 11 is d1, the thickness of the active material layer 22 is d2, and the sum of the thickness of the active material layer 22 and the thickness of the current collector 21 is d3, which satisfies d2≤d1≤d3.

[0094] wherein d2≤d1≤d3, that is, the size of the indentation portion 12 protruding from the outer circumferential surface of the roller body 11 is greater than or equal to the thickness of the active material layer 22, and less than or equal to the sum of the thickness of the active material layer 22 and the thickness of the current collector 21.

[0095] The indentation device 10 with such a structure can reduce the phenomenon that the indentation effect of the pole piece 20 is poor due to the size of the indentation portion 12 protruding from the outer circumferential surface of the roller body 11 being too small, and can reduce the risk that the current collector 21 of the pole piece 20 is damaged by the indentation portion 12 protruding from the outer circumferential surface of the roller body 11 being too large.

[0096] According to some embodiments of the present application, as shown in Figure 3 , Figure 4 and Figure 5 , along the thickness direction X of the pole piece, the current collector 21 is provided with the active material layer 22 on both sides. The indentation device 10 includes two roller bodies 11 and two indentation portions 12. The two roller bodies 11 are respectively arranged on both sides of the pole piece 20 in the thickness direction X of the pole piece. The two indentation portions 12 are respectively arranged on the two roller bodies 11 to form the indentation 23 on both sides of the pole piece 20.

[0097] In the above description, the pole piece 20 is provided with the roller body 11 on both sides, and each roller body 11 is correspondingly provided with the indentation portion 12, so that the roller body 11 can drive the corresponding indentation portion 12 to remove the active material layer 22 on one side of the pole piece 20, thereby forming the indentation 23 on the corresponding side of the pole piece 20.

[0098] It should be noted that in Figure 4 and Figure 5 , the pole piece 20 is provided with one roller body 11 on each side. Of course, in other embodiments, the pole piece 20 can be provided with two, three or four roller bodies 11 on each side, and the indentation portion 12 can be arranged corresponding to each roller body 11.

[0099] In some embodiments, the two roller bodies 11 can also be adjustably arranged on the two sides of the pole piece 20 along the thickness direction X of the pole piece, so as to adjust the distance between the marking part 12 and the pole piece 20. That is, the roller body 11 can also be movably arranged on one side of the pole piece 20 along the thickness direction X of the pole piece, so that the position of the roller body 11 relative to the pole piece 20 along the thickness direction X of the pole piece can be adjusted, so as to adjust the distance between the marking part 12 and the pole piece 20. The marking device 10 with such a structure can adjust the distance between the marking part 12 and the pole piece 20, so as to meet the marking requirements of pole pieces 20 with different thicknesses, and can effectively reduce the scratching phenomenon between the marking part 12 and the pole piece 20, thereby facilitating the improvement of the production quality of the pole piece 20. For example, the roller body 11 is installed on the output end of a pneumatic cylinder or an electric push rod, so as to drive the roller body 11 to move along the thickness direction X of the pole piece by the pneumatic cylinder or the electric push rod, so as to adjust the distance between the marking part 12 and the pole piece 20.

[0100] By arranging the roller body 11 on the two sides of the pole piece 20, and arranging the marking part 12 corresponding to each roller body 11, the marking requirements of the two sides of the pole piece 20 can be met, and the production rhythm of the pole piece 20 during marking can be optimized, thereby facilitating the improvement of the marking efficiency and production efficiency of the pole piece 20.

[0101] According to some embodiments of the present application, as shown in Figure 4 and Figure 5 , the two roller bodies 11 are oppositely arranged along the thickness direction X of the pole piece.

[0102] Among them, the two roller bodies 11 are oppositely arranged along the thickness direction X of the pole piece, that is, the two roller bodies 11 are arranged in sequence along the thickness direction X of the pole piece, and are located on the two sides of the pole piece 20.

[0103] In some embodiments, in Figure 5 , along the radial direction of the roller body 11, the roller body 11 has an abutting position arranged opposite to the marking part 12, when the abutting position of one roller body 11 abuts on one side of the pole piece 20, the marking part 12 on the other roller body 11 is pressed on the other side of the pole piece 20, so as to form two notches 23 arranged in a staggered manner on the two sides of the pole piece 20.

[0104] In the above description, when the abutting position of the roller body 11 on one side of the pole piece 20 abuts on the pole piece 20, the marking part 12 on the roller body 11 on the other side of the pole piece 20 is pressed on the pole piece 20, so that the rotation angles of the two marking parts 12 are different by 180 degrees, so that two notches 23 arranged in a staggered manner can be formed on the two sides of the pole piece 20, so as to meet the marking requirements of the pole piece 20.

[0105] In some embodiments, please refer to Figure 7 , as shown, Figure 7A structural schematic diagram of the marking device 10 is provided for some embodiments of the present application. Along the thickness direction X of the pole piece, two marking portions 12 are symmetrically arranged on both sides of the pole piece 20 to form two symmetrically arranged notches 23 on both sides of the pole piece 20. That is, when the marking portion 12 on the roller body 11 on one side of the pole piece 20 presses on the pole piece 20, the marking portion 12 on the roller body 11 on the other side of the pole piece 20 also presses on the pole piece 20, so that the marking portions 12 on the two roller bodies 11 can simultaneously press on both sides of the pole piece 20, thereby forming two symmetrically arranged notches 23 on both sides of the pole piece 20 by symmetrically arranging the two marking portions 12 on both sides of the pole piece 20 along the thickness direction X of the pole piece, so as to meet the marking requirement of the pole piece 20.

[0106] By oppositely arranging the two roller bodies 11 on both sides of the pole piece 20 along the thickness direction X of the pole piece, the two roller bodies 11 can mutually cooperate to support the pole piece 20, thereby facilitating the marking of the marking device 10 on both sides of the pole piece 20 and improving the marking quality of the pole piece 20.

[0107] According to some embodiments of the present application, please refer to Figure 8 , Figure 8 A structural schematic diagram of the marking device 10 is provided for some embodiments of the present application. The two roller bodies 11 are arranged at intervals along the conveying direction Y of the pole piece.

[0108] Among them, the two roller bodies 11 are arranged at intervals along the conveying direction Y of the pole piece, that is, the two roller bodies 11 are sequentially arranged along the conveying direction Y of the pole piece, so that there is a spacing between the two roller bodies 11 in the conveying direction Y of the pole piece.

[0109] By arranging the two roller bodies 11 of the marking device 10 at intervals along the conveying direction Y of the pole piece, the interference between the two roller bodies 11 can be effectively reduced, and the installation and debugging of the roller body 11 and the marking portion 12 can be facilitated.

[0110] In some embodiments, please continue to refer to Figure 8 As shown, the marking device 10 further comprises a support 14. The support 14 corresponds to the roller body 11 one by one, and the support 14 and the roller body 11 are oppositely arranged on both sides of the pole piece 20 along the thickness direction X of the pole piece, and the support 14 is used to support the pole piece 20.

[0111] Among them, each support 14 is arranged corresponding to one roller body 11, and the support 14 plays a role in supporting the pole piece 20, thereby facilitating the marking of the marking portion 12 on the side of the pole piece 20 away from the support 14.

[0112] Exemplarily, in Figure 8In some embodiments, the support member 14 is a roller arranged on the side of the pole piece 20 away from the roller body 11. The support member 14 in this structure is conducive to reducing the friction between the pole piece 20 and the support member 14, thereby reducing the damage to the pole piece 20. Of course, in other embodiments, the support member 14 can also be a support plate or a support block, etc.

[0113] By arranging one support member 14 corresponding to each roller body 11, and arranging the support member 14 and the roller body 11 opposite to each other along the thickness direction X of the pole piece, the support member 14 can play a better supporting role in the process of the marking part 12 extruding the mark of the pole piece 20, thereby improving the marking quality of the pole piece 20 and reducing the risk of breaking the pole piece 20.

[0114] According to some embodiments of the present application, the present application also provides a pole piece production system 100, as shown in Figure 1 and Figure 2 , the pole piece production system 100 comprises a conveying device and the marking device 10 of any of the above solutions, and the conveying device is used to convey the pole piece 20.

[0115] For example, the conveying device can be a roller conveyor or a plate chain conveyor, etc., which is used to provide driving force for the pole piece 20 to drive the pole piece 20 to move along the conveying direction Y of the pole piece. The specific structure of the conveying device can be referred to the related art, which will not be described here.

[0116] According to some embodiments of the present application, please continue to refer to Figure 1 and Figure 2 , the pole piece production system 100 further comprises a dust removal device 30. The dust removal device 30 is arranged downstream of the marking device 10 along the conveying direction Y of the pole piece, and the dust removal device 30 is used to remove dust from the side of the pole piece 20 provided with the roller body 11.

[0117] Among them, the dust removal device 30 is arranged downstream of the marking device 10 along the conveying direction Y of the pole piece, that is, along the conveying direction Y of the pole piece, the marking device 10 and the dust removal device 30 are arranged in sequence, that is, the production process of the pole piece 20 is first through the marking device 10, and then through the dust removal device 30.

[0118] Optionally, the dust removal device 30 can be various, such as ultrasonic dust removal device, negative pressure air suction device or adhesion device, etc., wherein the air blowing device is used to extract dust attached to the surface of the pole piece 20, and the adhesion device is used to adhere dust attached to the surface of the pole piece 20.

[0119] The pole piece production system 100 is further provided with a dust removal device 30, and the dust removal device 30 is arranged downstream of the marking device 10, so that the side of the pole piece 20 with the notch 23 can be dusted by the dust removal device 30 to reduce the dust attached to the pole piece 20 after the marking is completed, thereby facilitating the improvement of the production quality of the pole piece 20.

[0120] According to some embodiments of the present application, please continue to refer to Figure 1 and Figure 2 The dust removal device 30 includes a supporting roller 31 and an ultrasonic dust remover 32. The ultrasonic dust remover 32 and the supporting roller 31 are oppositely arranged on both sides of the pole piece 20 along the thickness direction X of the pole piece, and the ultrasonic dust remover 32 is located on the same side of the pole piece 20 as the roller body 11.

[0121] The supporting roller 31 is arranged on the side of the pole piece 20 away from the ultrasonic dust remover 32, and the supporting roller 31 serves to support the pole piece 20 to facilitate the ultrasonic dust remover 32 to dust the side of the pole piece 20 with the notch 23. The ultrasonic dust remover 32 is a device that uses dust-containing gas under acoustic vibration to cause dust particles to resonate, collide with each other, and coagulate into larger particles to settle down, thereby achieving the effect of dust removal. For the specific structure of the ultrasonic dust remover 32, please refer to the related technology, which will not be described here.

[0122] It should be noted that in other embodiments, the dust removal device 30 can also have other structures, for example, the dust removal device 30 includes a supporting roller 31 and a negative pressure air suction mechanism. The negative pressure air suction mechanism and the supporting roller 31 are oppositely arranged on both sides of the pole piece 20 along the thickness direction X of the pole piece, and the negative pressure air suction mechanism is located on the same side of the pole piece 20 as the roller body 11. The negative pressure air suction mechanism is used to suck air to the side of the pole piece 20 with the notch 23, thereby dusting the pole piece 20.

[0123] By arranging the supporting roller 31 on one side of the pole piece 20 and the ultrasonic dust remover 32 on the other side of the pole piece 20 corresponding to the supporting roller 31, the ultrasonic dust remover 32 can dust the side of the pole piece 20 with the notch 23. The dust removal device 30 with this structure can improve the dust removal effect on the pole piece 20 and reduce the damage to the pole piece 20 caused by the dust removal device 30 during dust removal.

[0124] According to some embodiments of the present application, please continue to refer to Figure 1 and Figure 2 The pole piece production system 100 includes two dust removal devices 30, and the two dust removal devices 30 are arranged at intervals along the conveying direction Y of the pole piece. The ultrasonic dust removers 32 of the two dust removal devices 30 are respectively located on both sides of the pole piece 20 along the thickness direction X of the pole piece.

[0125] Two dust removal devices 30 are arranged in sequence downstream of the marking device 10 along the conveying direction Y of the pole piece, and the ultrasonic dust removers 32 of the two dust removal devices 30 are respectively located on the two sides of the pole piece 20 to remove dust from the two sides of the pole piece 20.

[0126] By arranging the two dust removal devices 30 in sequence downstream of the marking device 10 along the conveying direction Y of the pole piece, and the ultrasonic dust removers 32 of the two dust removal devices 30 are respectively located on the two sides of the pole piece 20, the dust on the two sides of the pole piece 20 can be removed, which is conducive to further improving the dust removal quality of the pole piece 20.

[0127] According to some embodiments of the present application, please continue to refer to Figure 1 and Figure 2 The pole piece production system 100 further comprises a marking device 40 and a detection device. The marking device 40 is arranged upstream of the marking device 10 along the conveying direction Y of the pole piece, and the marking device 40 is used to form a mark at the position to be marked on the pole piece 20. The detection device is arranged between the marking device 40 and the marking device 10 along the conveying direction Y of the pole piece, and the detection device is used to detect the mark and generate a control signal, and the marking device 10 is configured to form a notch 23 at the position to be marked according to the control signal.

[0128] The marking device 40 is arranged upstream of the marking device 10 along the conveying direction Y of the pole piece, that is, the marking device 40 and the marking device 10 are arranged in sequence along the conveying direction Y of the pole piece, that is, the production process of the pole piece 20 is in the order of first passing through the marking device 40 and then passing through the marking device 10.

[0129] The marking device 40 is used to form a mark at the position to be marked on the pole piece 20. The mark can be various, which can be a point marked at the position to be marked on the pole piece 20, or a hole made at the position to be marked on the pole piece 20, of course, it can also be a scratch formed at the position to be marked on the pole piece 20, etc.

[0130] Optionally, the detection device can be an infrared sensor, a photosensitive sensor, or a distance sensor, etc. The detection device is used to detect the mark formed by the marking device 40 on the pole piece 20, and transmit a production control signal to the marking device 10, so that the marking device 10 marks the pole piece 20.

[0131] The pole piece production system 100 is further provided with a marking device 40 and a detection device. The marking device 40 can mark the position to be marked on the pole piece 20, and the detection device can detect and feedback, so that the roller body 11 can drive the marking part 12 to form a notch 23 at the position to be marked on the pole piece 20, thereby effectively improving the marking precision of the pole piece 20 and improving the production quality of the pole piece 20.

[0132] According to some embodiments of the present application, please continue to refer toFigure 1 and Figure 2 The marking device 40 includes a hole making mechanism 41. The hole making mechanism 41 is configured to make a marking hole at the position to be marked on the pole piece 20, and the detection device is configured to detect the marking hole and generate a control signal.

[0133] In some embodiments, the hole making mechanism 41 is arranged on one side of the pole piece 20, and the hole making mechanism 41 is configured to make a hole at the position to be marked on the pole piece 20, thereby forming a marking hole, which is the marking formed by the marking device 40 on the pole piece 20. The specific structure of the hole making mechanism 41 can be referred to related art, which will not be described here.

[0134] For example, the hole making mechanism 41 includes two hole making mechanisms 41, which are arranged along the width direction Z of the pole piece 20, so as to make two marking holes on the pole piece 20, thereby facilitating the detection accuracy of the detection device.

[0135] In some embodiments, the marking device 40 can further include a waste box 42, which is arranged on the side of the pole piece 20 away from the hole making mechanism 41, and the waste box 42 is configured to receive the waste generated during the making of the marking hole on the pole piece 20, thereby reducing the risk of waste scattering.

[0136] The hole making mechanism 41 is used as the marking device 40 to make a marking hole at the position to be marked on the pole piece 20, thereby marking the position to be marked on the pole piece 20. The marking device 40 has a simple structure, is easy to implement, and is conducive to the detection of the marking hole made at the position to be marked by the detection device, thereby effectively improving the detection accuracy of the detection device.

[0137] According to some embodiments of the present application, as shown in Figures 1-6 The present application provides a marking device 10, which includes two roller bodies 11, two mounting portions 13 and two marking portions 12. The two roller bodies 11 are arranged on the two sides of the pole piece 20 along the thickness direction X of the pole piece 20, and the axis of the roller body 11 extends along the width direction Z of the pole piece. The outer circumferential surface of the roller body 11 is provided with a mounting groove 111 extending along the axis direction of the roller body 11, each mounting portion 13 is clamped in the mounting groove 111 of one roller body 11, and each marking portion 12 is connected to one mounting portion 13. The marking portion 12 protrudes from the outer circumferential surface of the roller body 11, and is configured to press the surface of the pole piece 20 when the roller body 11 rotates, so as to remove the active material layer 22 and form a notch 23. In the radial direction of the roller body 11 away from the roller body 11, the width of the marking portion 12 in the circumferential direction of the roller body 11 gradually decreases, and the end of the marking portion 12 away from the roller body 11 is an arc surface or a flat surface.

[0138] The present application also provides a pole piece marking method, which can be referred to Figure 9 , Figure 9A flowchart of a method for marking a pole piece is provided for some embodiments of the present application. The method for marking a pole piece comprises:

[0139] S100: providing a pole piece 20, the pole piece 20 comprising a current collector 21 and an active material layer 22, at least one side of the current collector 21 being provided with the active material layer 22 along a thickness direction X of the pole piece;

[0140] S200: providing a marking device 10, the marking device 10 comprising a roller body 11 and a marking portion 12, the marking portion 12 being arranged on the roller body 11 and protruding from an outer circumferential surface of the roller body 11, the marking portion 12 extending along an axis of the roller body 11;

[0141] S300: rotating the roller body 11 to drive the marking portion 12 to press against a surface of the pole piece 20 to form a score 23 on the active material layer 22, the score 23 extending along a width direction Z of the pole piece.

[0142] It should be noted that the structure of the marking device 10 used in the method for marking a pole piece described above can refer to the marking device 10 provided in the above-mentioned embodiments, which will not be described here again.

[0143] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0144] The above is only the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A marking device for marking an electrode tab, the electrode tab including a current collector and an active material layer, the active material layer being provided on both sides of the current collector in a thickness direction of the electrode tab, characterized by, The marking device comprises: a roller body arranged on the side of the pole piece with the active material layer in the thickness direction, and the axis of the roller body extends in the width direction of the pole piece; and a marking part arranged on the roller body and protruding from the outer peripheral surface of the roller body, the marking part extends in the axial direction of the roller body, and the marking part is configured to press the active material layer when the roller body rotates to form a notch on the active material layer; The marking device comprises two roller bodies and two marking parts, two roller bodies are arranged on both sides of the pole piece in the thickness direction, and two marking parts are arranged on two roller bodies to form notches on both sides of the pole piece, thereby facilitating the stacking of the pole piece.

2. The marking device of claim 1, wherein, The marking part is detachably connected to the roller body.

3. The marking device of claim 2, wherein, The outer peripheral surface of the roller body is provided with a mounting groove extending in the axial direction of the roller body; The marking device further comprises a mounting part connected to the marking part, and the mounting part is clamped in the mounting groove.

4. The marking device of claim 1, wherein, In the radial direction of the roller body, the width of the marking part in the circumferential direction of the roller body gradually decreases away from the roller body.

5. The marking device of claim 4, wherein, In the radial direction of the roller body, the end of the marking part away from the roller body is an arc surface or a flat surface.

6. The marking device of claim 1, wherein, The size of the marking part protruding from the outer peripheral surface of the roller body is d1, the thickness of the active material layer is d2, and the sum of the thickness of the active material layer and the thickness of the current collector is d3, which satisfies d2≤d1≤d3.

7. The marking device of claim 1, wherein, Two roller bodies are arranged in the conveying direction of the pole piece.

8. The marking device of claim 1, wherein, Two roller bodies are arranged in the thickness direction.

9. The marking device of claim 8, wherein, In the thickness direction, two marking parts are symmetrically arranged on both sides of the pole piece to form symmetrically arranged notches on both sides of the pole piece.

10. The marking device of claim 8, wherein, In the radial direction of the roller body, the roller body has an abutting position opposite to the marking part, when the abutting position of one roller body abuts on one side of the pole piece, the marking part on the other roller body is pressed on the other side of the pole piece to form the notches arranged in staggered manner on both sides of the pole piece.

11. The marking device according to any one of claims 1-7, characterized in that The marking device further comprises: a support corresponding to the roller body, the support and the roller body are arranged on both sides of the pole piece in the thickness direction, and the support is used to support the pole piece.

12. A pole piece production system characterized by, Comprise: The marking device according to any one of claims 1-11; And Conveying device for conveying the pole piece.

13. The pole piece production system of claim 12, wherein, The pole piece production system further comprises: A dust removal device is arranged downstream of the marking device in the conveying direction of the pole piece, and the dust removal device is used to remove dust from the side of the pole piece provided with the roller body.

14. The pole piece production system of claim 13, wherein, The dust removal device comprises: a support roller; An ultrasonic dust remover is arranged on both sides of the pole piece in the thickness direction opposite to the support roller, and the ultrasonic dust remover is located on the same side of the pole piece as the roller body.

15. The pole piece production system of claim 14, wherein, The pole piece production system comprises: Two dust removal devices are arranged in the conveying direction, and the ultrasonic dust remover of each dust removal device is located on both sides of the pole piece in the thickness direction.

16. The pole piece production system of any of claims 12-15, wherein, The pole piece production system further comprises: An identification device is arranged upstream of the marking device in the conveying direction of the pole piece, and is configured to form an identification mark at a position to be marked on the pole piece; A detection device is arranged between the identification device and the marking device in the conveying direction, and is configured to detect the identification mark and generate a control signal, and the marking device is configured to form the notch at the position to be marked according to the control signal.

17. The pole piece production system of claim 16, wherein, The identification device comprises: A hole forming mechanism is configured to form a mark hole at the position to be marked on the pole piece, and the detection device is configured to detect the mark hole and generate the control signal.

18. A method of scoring a pole piece, the method comprising: The method comprises: Providing a pole piece, which comprises a current collector and an active material layer, and the active material layer is arranged on both sides of the current collector in the thickness direction of the pole piece; Providing a marking device, which comprises two roller bodies and two marking portions, the two roller bodies are arranged on both sides of the pole piece in the thickness direction, and the two marking portions are arranged on the two roller bodies respectively and protrude from the outer circumferential surface of the roller bodies, and the marking portions extend along the axis of the roller bodies; Rotating the roller bodies to make the roller bodies drive the marking portions to press the surface of the active material layer of the pole piece, so as to form notches extending in the width direction of the pole piece on the active material layers on both sides of the pole piece, thereby facilitating the stacking of the pole pieces.

Images