Extrusion device, pole piece processing equipment and battery processing equipment

Abstract

The invention provides an extrusion device (100), pole piece processing equipment (1000) and battery processing equipment. The battery processing equipment comprises pole piece processing equipment (1000) and shaping equipment (2000), the pole piece processing equipment (1000) comprises an extrusion device (100), and the extrusion device (100) comprises a first extrusion piece (10) with a first surface (101) and a second extrusion piece (20) with a second surface (201). The first surface (101) and the second surface (201) are used for cooperatively extruding an extruded part (C), and the first surface (101) and / or the second surface (201) are / is provided with receding grooves (40). Local clearance is performed on the diaphragm (B) through the clearance groove (40), so that the diaphragm (B) can play a viscous role in shaping operation, and the problem of poor bonding of the electrode assembly is solved.

Description

Extrusion equipment, pole piece processing equipment and battery processing equipment Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to an extrusion device, a pole piece processing equipment and a battery processing equipment. Background Art

[0002] In the battery processing technology, it is usually necessary to first stack the pole pieces and the diaphragm and extrude them to form a composite pole piece, and then shape the composite pole piece by winding or stacking to form an electrode assembly.

[0003] However, in some cases, the extrusion operation on the electrode sheets and diaphragms may easily lead to poor shaping and bonding, thereby causing a decrease in the quality of the electrode assembly. Technical issues

[0004] One of the purposes of the embodiments of the present application is to provide an extrusion device, a pole piece processing device and a battery processing device that can improve the problem of poor shaping and bonding. Technical Solutions

[0005] The technical solution adopted in the embodiment of this application is:

[0006] In a first aspect, an extrusion device is provided, comprising:

[0007] a first extrusion having a first surface;

[0008] The second extrusion piece has a second surface. The first surface and the second surface are used to cooperate with each other to extrude the extruded piece. The first surface and / or the second surface are provided with a space-avoiding groove.

[0009] By adopting this technical solution, during the process of the first and second surfaces cooperating to compress the extruded part, the extruded part can be aligned with the air-avoidance groove. Thus, the air-avoidance groove enables the extrusion device to achieve a localized air-avoidance effect on the extruded part, thereby achieving a corresponding localized extrusion effect on the extruded part. This arrangement can reduce damage to the extrusion device and further improve the problem of poor shaping and bonding of the extruded part.

[0010] In some embodiments, the first surface is a plane or a cylindrical surface, and the second surface is a plane or a cylindrical surface.

[0011] By adopting the above technical solution, the forms in which the first extrusion member and the second extrusion member are used to extrude the extruded member can be varied, thereby making the first extrusion member and the second extrusion member have high design flexibility.

[0012] In some embodiments, the groove wall of the air-avoiding groove transitions to the first surface in an arc shape, and / or the groove wall of the air-avoiding groove transitions to the second surface in an arc shape.

[0013] By adopting the above technical solution, the problem of the extruded piece being punctured can be improved, so that the conveying and extrusion of the extruded piece can be smoothly achieved.

[0014] In some embodiments, the first surface is provided with a plurality of space-avoiding grooves distributed at intervals, and / or the second surface is provided with a plurality of space-avoiding grooves distributed at intervals.

[0015] By adopting the above-mentioned technical solution, only simple processing of the first extrusion part and / or the second extrusion part is required to achieve the local air avoidance effect of the extrusion device on the diaphragm and achieve local extrusion of the diaphragm, so as to improve the problem of decreased shaping adhesion of the diaphragm and damage to the diaphragm due to extrusion.

[0016] In some embodiments, the plurality of air-avoiding grooves on the first surface and / or the second surface are evenly distributed.

[0017] By adopting the above technical solution, when the extrusion device is used to extrude the diaphragm and the electrode, the extrusion device can extrude multiple evenly distributed portions of the diaphragm, thereby providing the diaphragm with better composite bonding strength. In addition, the multiple evenly distributed portions of the diaphragm are left free, thereby providing the diaphragm with better shaping bonding strength.

[0018] In some embodiments, center points of the plurality of air-avoiding grooves on the first surface and / or the second surface may be connected to form a grid structure, and the smallest grid unit of the grid structure is an equilateral triangle.

[0019] By adopting the above technical solution, the portion of the extruded piece that is free from air is distributed densely and evenly along the direction Y and the conveying direction of the extruded piece, so that the diaphragm has better composite bonding strength and shaping bonding strength.

[0020] In some embodiments, the air-avoiding groove includes a plurality of first grooves and second grooves, and two adjacent first grooves are connected through the second groove.

[0021] By adopting the above technical solution, the molding process of the first extruded part and / or the second extruded part is very flexible and easy to implement.

[0022] In some embodiments, the contour of the air-avoiding groove on the first surface and / or the second surface is circular, oval, or square.

[0023] By adopting the above technical solution, the design of the air avoidance groove can be very flexible and easy to implement.

[0024] In some embodiments, the air-avoiding groove is configured such that the ratio of the area of ​​the portion of the extruded component facing the air-avoiding groove to the area of ​​the extruded component is in a range of 30% to 40%.

[0025] By adopting the above technical solution, the composite bonding force of the diaphragm can meet the bonding reliability requirements of the composite electrode, and the shaping bonding force of the diaphragm can also meet the bonding reliability requirements of the electrode assembly, thereby helping to improve the quality of the electrode assembly.

[0026] In some embodiments, the air-avoiding groove is provided on the first surface, and the ratio of the first area to the second area of ​​the air-avoiding groove on the first surface is in the range of 30% to 40%; the second area is the sum of the first area and the area of ​​the first surface.

[0027] By adopting the above technical solution, the extruded part has a 30% to 40% air gap ratio. This configuration, when the extrusion device is used to extrude the diaphragm and electrode sheet, can give the diaphragm better composite bonding strength and shaping bonding strength, thereby improving the problem of poor shaping bonding and enhancing the quality of the electrode assembly.

[0028] In some embodiments, the depth of the air-avoiding groove is greater than 40 μm.

[0029] By adopting the above technical solution, the diaphragm has a better ability to combine the diaphragm and the electrode to form a composite electrode, that is, it has a better composite ability, so that the composite electrode has better quality.

[0030] In some embodiments, the depth of the air-avoiding groove is greater than 100 μm.

[0031] Through the above technical solution, the composite electrode can have better bonding reliability, thereby meeting the quality requirements of the composite electrode.

[0032] In some embodiments, both the first extrusion component and the second extrusion component are provided with a clearance groove, and the clearance groove of the first extrusion component and the clearance groove of the second extrusion component are staggered with respect to the extrusion positions corresponding to the extruded component.

[0033] By adopting the above technical solution, the manufacturing process of the first extrusion member and the second extrusion member can be simplified. In addition, by simultaneously designing the first extrusion member and the second extrusion member to avoid air gaps, the difference in quality between the first extrusion member and the second extrusion member can be minimized, thereby facilitating the stability of the extrusion effect of the first extrusion member and the second extrusion member on the extruded member.

[0034] In some embodiments, the first extrusion member and / or the second extrusion member is a pressing roller rotatable around its rotation axis, and an outer peripheral surface of the pressing roller is provided with an air-avoiding groove.

[0035] By adopting the above technical solution, a rolling effect can be achieved on the extruded part, so that the extruded part can be transported while being rolled by the first extruded part and the second extruded part, so that the extrusion device can have a higher rolling efficiency for the extruded part.

[0036] In some embodiments, the pressing device further includes a cleaning component for cleaning the pressing roller.

[0037] By adopting the above technical solution, the residues on the pressing roller can be removed, thereby improving the problem of the residues damaging the extruded part when the pressing roller presses the extruded part.

[0038] In some embodiments, the cleaning assembly includes:

[0039] A dust collection box is provided with a receiving groove, a dust collection bin, and a dust collection port communicating with the receiving groove and the dust collection bin;

[0040] A cleaning member is assembled in the receiving groove, with a portion of the cleaning member exposed outside the receiving groove and capable of elastically abutting and frictionally contacting with the outer peripheral surface of the pressure roller when the pressure roller rotates;

[0041] The dust collection box is connected to an external exhaust device so that the residue on the cleaning piece can enter the dust collection bin through the dust collection port under the action of the exhaust device.

[0042] By adopting the above technical solution, in the process of the pressure roller pressing the extruded part, the cleaning part cleans the residue on the pressure roller, and the exhaust device can draw the residue cleaned by the cleaning part into the dust collection bin or the exhaust device, thereby realizing real-time cleaning of the pressure roller to improve the problem of residue damaging the extruded part.

[0043] In some embodiments, the cleaning member is rotatable, and the rotation axis of the cleaning member is parallel to the rotation axis of the pressure roller.

[0044] By adopting the above technical solution, the cleaning member can rotate relative to the pressure roller, and the rotation axis of the cleaning member is parallel to the rotation axis of the pressure roller, so that the cleaning member can elastically support and frictionally contact various positions of the outer peripheral surface of the pressure roller in turn, thereby achieving the cleaning effect of the residue on the pressure roller.

[0045] In some embodiments, the cleaning assembly further includes a scraper disposed in the receiving groove, and the scraper is used to scrape off residues on the cleaning member when the cleaning member rotates.

[0046] By adopting the above technical solution, during the rotation of the cleaning member, the cleaning member moves relative to the scraping member, so that the scraping member can scrape off the residue remaining on the cleaning member, thereby improving the problem of the residue remaining on the cleaning member damaging the extruded member during the process of the pressure roller pressing the extruded member.

[0047] In some embodiments, the extrusion device also includes a dust-sticking component, which includes a first dust-sticking roller that can be rotatably arranged, the rotation axis of the first dust-sticking roller is parallel to the rotation axis of the pressure roller, the outer peripheral surface of the first dust-sticking roller contacts the outer peripheral surface of the pressure roller, and can stick to and remove residues from the pressure roller during rotation.

[0048] By adopting the above technical solution, the first sticky roller can rotate in the opposite direction to the pressure roller, so as to remove the residue on the pressure roller, thereby improving the problem of damage to the extruded part caused by the residue on the pressure roller.

[0049] In some embodiments, the dust-sticking assembly also includes a rotatable second dust-sticking roller, the rotation axis of the second dust-sticking roller is parallel to the rotation axis of the first dust-sticking roller, the outer peripheral surface of the second dust-sticking roller contacts the outer peripheral surface of the first dust-sticking roller, and can remove the residue of the first dust-sticking roller during rotation.

[0050] By adopting the above technical solution, the second sticky roller can remove the residue on the outer peripheral surface of the first sticky roller, which is beneficial for the first sticky roller to continuously achieve the effect of removing the residue on the outer peripheral surface of the pressure roller.

[0051] In some embodiments, the extrusion device includes a cleaning component, which is used to clean the pressure roller. The dust-binding component and the cleaning member are distributed in sequence along the rotation path of the pressure roller.

[0052] By adopting the above technical solution, it is helpful to improve the cleaning force of the pressure roller, so as to improve the problem that the extruded part C is damaged by the residue on the pressure roller.

[0053] In a second aspect, a pole piece processing device is provided, comprising an extrusion device for extruding pole pieces and diaphragms.

[0054] By adopting the above technical solution, in the process of the extrusion device squeezing the electrode sheet and the diaphragm to form a composite electrode sheet, the air avoidance groove of the extrusion device can realize local air avoidance of the diaphragm, which can reduce the damage of the extrusion device to the diaphragm, so that after the extrusion operation, the adhesion force of the air avoided part of the diaphragm can be retained, and then it can play a sticky role in the subsequent shaping operation, thereby improving the problem of poor adhesion of the electrode assembly, which helps to improve the quality of the electrode assembly.

[0055] In some embodiments, the electrode processing equipment further includes a heating device for heating the electrode and the diaphragm, and an extrusion device for extruding the heated electrode and the diaphragm.

[0056] By adopting the above technical solution, the electrode and the diaphragm are first heated by a heating device and then locally extruded by an extrusion device, so as to form a composite electrode, which makes the composite electrode have better bonding reliability.

[0057] In a third aspect, a battery processing device is provided, comprising:

[0058] Pole piece processing equipment, used to extrude pole pieces and diaphragms to form composite pole pieces;

[0059] Shaping equipment is used to shape composite pole pieces into electrode assemblies.

[0060] By adopting the above technical solution, in the process of the extrusion device squeezing the electrode sheet and the diaphragm to form a composite electrode sheet, the air avoidance groove of the extrusion device can realize local air avoidance of the diaphragm, which can reduce the damage of the extrusion device to the diaphragm, so that the diaphragm can retain the adhesion of the avoided part after the extrusion operation, and then can play a sticky role in the shaping operation, thereby improving the problem of poor adhesion of the electrode assembly, which helps to improve the quality of the electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0062] FIG1 is a schematic diagram of rolling of a pole piece and a diaphragm in some cases;

[0063] FIG2 is a perspective schematic diagram of an extrusion device and an extruded part provided in some embodiments of the present application;

[0064] FIG3 is a top view of FIG2 ;

[0065] FIG4 is a cross-sectional view taken along line AA in FIG3 ;

[0066] FIG5 is a schematic diagram of the extrusion device of FIG4 ;

[0067] FIG6 is a diagram showing the coordination of a first extrusion member and a second extrusion member provided in some other embodiments of the present application;

[0068] FIG7 is a diagram showing the coordination of a first extrusion member and a second extrusion member provided in some other embodiments of the present application;

[0069] FIG8 is a schematic diagram of a first extrusion member provided in some other embodiments of the present application;

[0070] FIG9 is a schematic diagram of a second extrusion member provided in some other embodiments of the present application;

[0071] FIG10 is a partial schematic diagram of a first extrusion member provided in some embodiments of the present application;

[0072] FIG11 is a partial enlarged view of point B in FIG3 ;

[0073] FIG12 is a schematic diagram of a grid structure formed by connecting the air-avoiding grooves on the first extrusion member shown in FIG11;

[0074] FIG13 is a top view of a first extrusion member provided in some other embodiments of the present application;

[0075] FIG14 is a side view of a first extrusion member provided in some other embodiments of the present application;

[0076] FIG15 is a graph showing the relationship between the air gap ratio of the diaphragm and the composite bonding strength and the shaping bonding strength;

[0077] FIG16 is a diagram showing the coordination of a first extrusion member and a second extrusion member provided in some further embodiments of the present application;

[0078] FIG17 is a graph showing the relationship between the depth of the air-avoiding groove and the composite bonding strength of the diaphragm;

[0079] FIG18 is a schematic diagram of a cleaning assembly of the extrusion device shown in FIG5 ;

[0080] FIG19 is a schematic diagram of a pole piece processing device provided in some embodiments of the present application;

[0081] FIG20 is a schematic diagram of a pole piece processing device provided in some other embodiments of the present application;

[0082] Figure 21 is a schematic diagram of battery processing equipment provided by some embodiments of the present application.

[0083] Among them, the reference numerals in the figures are:

[0084] 1000-pole piece processing equipment; 2000-shaping equipment; 100-extrusion device; 200-heating device; 10-first extrusion piece; 101-first surface; 11-base; 12-extrusion part; 20-second extrusion piece; 201-second surface; 30-extrusion gap; 40-air avoidance groove; 401-first groove; 402-rounded corner; 403-second groove; 50-cleaning component; 51-cleaning part; 511-rotating body; 512-elastic part; 52-dust collection box; 521-accommodating groove; 522-dust collection bin; 523-dust collection port; 53-scraping part; 60-dust sticking component; 61-first dust sticking roller; 62-second dust sticking roller; A-pole piece; A1-first pole piece; A2-second pole piece; B-diaphragm; C-extruded part; D-grid structure; D1-grid unit; D2-line segment. Modes for Carrying Out the Invention

[0085] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0086] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0088] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0089] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0090] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0091] In the battery processing technology, it is usually necessary to first stack the pole pieces and the diaphragm and extrude them to form a composite pole piece, and then shape the composite pole piece by winding or stacking to form an electrode assembly.

[0092] During the process of extruding the diaphragm and electrode sheet to form a composite electrode sheet, the diaphragm achieves the bonding and composite effect of the diaphragm and electrode sheet through its adhesive force (composite adhesive force). During the process of shaping the composite electrode sheet to form an electrode assembly, the diaphragm also needs to achieve the desired bonding effect of the formed electrode assembly through its adhesive force (shaping adhesive force).

[0093] However, in some cases, squeezing the electrode and separator often damages the adhesive coating on the separator surface, reducing the separator's adhesion. This makes it difficult for the separator to exert its adhesive properties during the composite electrode shaping process, which can lead to poor adhesion of the electrode assembly and, in turn, reduced quality.

[0094] Based on the above considerations, the inventors have conducted in-depth research and designed an extrusion device, namely the extrusion device mentioned in the first aspect of the embodiment of the present application. By providing an air-avoidance groove on the first surface of the first extrusion member and / or the second surface of the second extrusion member to avoid air from the diaphragm, the damage to the diaphragm caused by the extrusion device can be reduced, so that after the extrusion operation, the adhesion of the diaphragm avoided by the air-avoidance groove can be retained, and then the adhesive effect can be exerted in the subsequent shaping operation, thereby improving the problem of poor adhesion of the electrode assembly, which helps to improve the quality of the electrode assembly.

[0095] Please refer to Figure 1, which shows a schematic diagram of the rolling of the electrode A and the diaphragm B under certain circumstances. During the rolling process, the diaphragm B is first stacked on both sides of the first electrode A1, and the first electrode A1 and the diaphragm B are transported, and the transport direction of the first electrode A1 and the diaphragm B is the direction X shown in the figure. Then, the second electrode A2 is stacked on the diaphragm B on both sides of the first electrode A1, and the second electrode A2 on both sides of the first electrode A1 are staggered in sequence. Finally, the first electrode A1, the diaphragm B and the second electrode A2 are rolled to form a composite electrode. Among them, since the second electrode A2 on both sides of the first electrode A1 are staggered in sequence, among the multiple second electrode A2 located on the same side of the first electrode A1, the position between any two adjacent second electrode A2 has a portion of the diaphragm B exposed. When the composite electrode is stacked, the exposed portion of the diaphragm B needs to be stacked and bonded with the adjacent second electrode A2.

[0096] However, when the first pole piece A1, the second pole piece A2 and the diaphragm B are rolled, the sticky coating on the surface of the diaphragm B is rolled and destroyed, causing the adhesion of the diaphragm B to decrease. Specifically, the diaphragm B includes a substrate and a plurality of bonding points provided on the surface of the substrate. The bonding points are formed by the sticky coating, which enables the diaphragm B to have the ability to bond. It can be seen that when the diaphragm B is rolled, the bonding points on the surface of the diaphragm B are destroyed, thereby losing its bonding ability. Therefore, when the composite pole pieces are stacked, the exposed part of the above-mentioned diaphragm B cannot be bonded to the adjacent second pole piece A2 due to the decrease in bonding strength, that is, the shaping bonding strength of the diaphragm B decreases, resulting in poor bonding of the formed electrode assembly, thereby affecting the quality of the electrode assembly.

[0097] The first electrode A1 can be a positive electrode, and correspondingly, the second electrode A2 can be a negative electrode. Of course, the first electrode A1 can also be a negative electrode, and correspondingly, the second electrode A2 can be a positive electrode.

[0098] The electrode A involved in the above and following embodiments may refer to the first electrode A1 or the second electrode A2, that is, the positive electrode or the negative electrode.

[0099] The composite bonding force of diaphragm B referred to above and below refers to the ability of diaphragm B to combine with electrode piece A after diaphragm B and electrode piece A are squeezed to form a composite electrode piece, that is, the bonding reliability of diaphragm B and electrode piece A to form a composite electrode piece, which may include the bonding ability of diaphragm B before diaphragm B and electrode piece A are squeezed. The shaping bonding force of diaphragm B referred to above and below refers to the ability of diaphragm B to combine with electrode piece A during the process of stacking and shaping the composite electrode pieces to form an electrode assembly, that is, the bonding reliability of the composite electrode pieces to form an electrode assembly. It can be understood that diaphragm B first bonds to electrode piece A through its composite bonding force to form a composite electrode piece with electrode piece A, and then bonds to electrode piece A through its shaping bonding force to form an electrode assembly with electrode piece A.

[0100] Referring to Figures 2 and 19 , the extrusion device 100 provided in the first aspect of the present embodiment is primarily used to extrude the electrode sheet A and the diaphragm B, thereby forming a composite electrode sheet from the electrode sheet A and the diaphragm B. This allows the electrode sheet A and the diaphragm B to form an electrode assembly in a subsequent shaping process. Of course, depending on actual application requirements, the extrusion device 100 may also be used to extrude an extruded component C other than the electrode sheet A and the diaphragm B, but this embodiment is not limited thereto.

[0101] It is understandable that the extruded part C mentioned below can be the pole piece A and the diaphragm B, or the pole piece A, or the diaphragm B, or other extruded parts C other than the pole piece A and the diaphragm B. The extruded part C can be a sheet material or a block structure or other profile.

[0102] Furthermore, the extrusion device 100 is used to extrude an extruded part C, and may extrude one extruded part C or may extrude multiple extruded parts C, so as to extrude the multiple extruded parts C into a whole.

[0103] When the extrusion device 100 described below is used to extrude the electrode A and the diaphragm B, the number and distribution of the electrode A and the diaphragm B can be the number and distribution shown in Figures 1 and 19, or other numbers and distributions, which are not limited here.

[0104] Please refer to Figures 2 to 5 and Figure 19 together. The extrusion device 100 mainly includes a first extrusion member 10 and a second extrusion member 20. The first extrusion member 10 has a first surface 101, and the second extrusion member 20 has a second surface 201. The first surface 101 and the second surface 201 are used to cooperate in extruding the extruded member C. In some embodiments, as shown in Figures 2, 3, and 8, the first surface 101 is provided with a clearance groove 40; or, in other embodiments, as shown in Figure 9, the second surface 201 is provided with a clearance groove 40; or, in still other embodiments, both the first surface 101 and the second surface 201 are provided with a clearance groove 40.

[0105] The first extrusion 10 and the second extrusion 20 are both structures used to extrude the extruded part C. The first extrusion 10 and the second extrusion 20 may be, but are not limited to, in the form of a block, a plate, a roller, etc. The first surface 101 refers to the surface of the first extrusion 10 used to extrude the extruded part C, and the second surface 201 refers to the surface of the second extrusion 20 used to extrude the extruded part C.

[0106] Definition: The extruded part C needs to be extruded along a predetermined direction. The first surface 101 and the second surface 201 cooperate to extrude the extruded part C, which means that the first surface 101 and the second surface 201 respectively extrudes the two sides of the extruded part C along the predetermined direction. Specifically, the first surface 101 extrudes one side of the extruded part C along the predetermined direction, and the second surface 201 extrudes the other side of the extruded part C along the predetermined direction, so that the extruded part C is subjected to opposite extrusion effects, that is, the effect of the first extrusion part 10 and the second extrusion part 20 cooperating to extrude the extruded part C is achieved. For example, when the extruded part C is a sheet, the first surface 101 and the second surface 201 can respectively extrude the two sides of the extruded part C along the thickness direction.

[0107] As shown in Figures 4 and 5, the first extrusion member 10 and the second extrusion member 20 are spaced apart along the direction Z, and the first surface 101 of the first extrusion member 10 and the second surface 201 of the second extrusion member 20 are spaced apart to form an extrusion gap 30. Furthermore, the extrusion gap 30 extends through the entire structure formed by the first extrusion member 10 and the second extrusion member 20 along the direction X. In this way, the extruded member C can pass through the extrusion gap 30 from one side to the other side along the direction X. Based on this, during the process of the extruded member C passing through the extrusion gap 30 (i.e., during the conveyance of the extruded member C), the two sides of the extruded member C along the direction Z are respectively in contact with the first surface 101 and the second surface 201, so that the first extrusion member 10 presses one side of the extruded member C along the direction Z through the first surface 101, and the second extrusion member 20 presses the other side of the extruded member C along the direction Z through the second surface 201. In this way, the first extrusion member 10 and the second extrusion member 20 can respectively apply pressure to both sides of the extruded member C along a predetermined direction, thereby achieving an extrusion effect on the extruded member C. The direction X is perpendicular to the direction Z, and the direction Z is the predetermined direction mentioned above.

[0108] The dimension of the extrusion gap 30 along the direction Z is smaller than the thickness of the extruded part C along the predetermined direction. Therefore, when the extruded part C passes through the extrusion gap 30 , the extruded part C is subjected to the combined extrusion of the first extrusion part 10 and the second extrusion part 20 , so that the thickness of the extruded part C along the predetermined direction is reduced after passing through the extrusion gap 30 .

[0109] When the first surface 101 defines the air escape groove 40, the first extrusion member 10 is recessed inward from the first surface 101 to form the air escape groove 40, so that the opening of the air escape groove 40 is exposed to the first surface 101. In other words, the first surface 101 defines the opening of the air escape groove 40. The groove wall of the air escape groove 40 is connected to the first surface 101.

[0110] When the second surface 201 defines the air escape groove 40, the second extrusion member 20 is recessed inward from the second surface 201 to form the air escape groove 40, so that the opening of the air escape groove 40 is exposed to the second surface 201. In other words, the second surface 201 defines the opening of the air escape groove 40. The groove wall of the air escape groove 40 is connected to the second surface 201.

[0111] The air escape groove 40 is provided so that the first surface 101 and the second surface 201 can achieve an air escape effect on the extruded part C during the process of extruding the extruded part C. Specifically, when the first surface 101 is provided with the air escape groove 40, the position where the first extruded part 10 and the second extruded part 20 are separated to form the extrusion gap 30 can have the air escape groove 40, and the air escape groove 40 is connected to the extrusion gap 30. When the second surface 201 is provided with the air escape groove 40, the position where the second extruded part 20 and the first extruded part 10 are separated to form the extrusion gap 30 can have the air escape groove 40, and the air escape groove 40 is connected to the extrusion gap 30. With this arrangement, when the extruded part C passes through the extrusion gap 30, when the extruded part C is respectively attached to the first surface 101 and the second surface 201 on both sides along a predetermined direction, the extruded part C also covers the opening of the air escape groove 40 so as to be directly opposite to the air escape groove 40, thereby achieving air escape through the air escape groove 40. In other words, a portion of the extruded component C passing through the extrusion gap 30 is squeezed by the first surface 101 of the first extruded component 10 and the second surface 201 of the second extruded component 20, while the other portion is freed from the first extruded component 10 and the second extruded component 20 by the freeing groove 40. That is, the provision of the freeing groove 40 allows a portion of the extruded component C to be freed from the freeing, that is, the extruded component C is partially freed from the freeing, and thus only a portion of the extruded component C is squeezed.

[0112] It should be noted that as the extruded part C passes through the extrusion gap 30, a portion of the extruded part C is extruded by both the first extrusion part 10 and the second extrusion part 20 along both sides of the predetermined direction. This portion of the extruded part C is subjected to the extrusion effect. Another portion of the extruded part C faces the air escape groove 40 on one or both sides along the predetermined direction. This portion of the extruded part C is also subjected to the air escape effect. Consequently, only a portion of the extruded part C is subjected to the extrusion effect, and accordingly, the extruded part C is partially air escaped.

[0113] The extrusion device 100 provided in the embodiment of the present application has a clearance groove 40 provided on the first surface 101 of the first extrusion member 10 for extruding the extruded member C and / or the second surface 201 of the second extrusion member 20 for extruding the extruded member C. This allows the extruded member C to be aligned with the clearance groove 40 during the process of the first surface 101 and the second surface 201 cooperating to extrude the extruded member C. Thus, the provision of the clearance groove 40 enables the extrusion device 100 to achieve local clearance of the extruded member C, thereby correspondingly achieving a local extrusion effect of the extrusion device 100 on the extruded member C. With such a configuration, when the extrusion device 100 is used to extrude a plurality of extruded members C into a whole, the local extrusion and clearance effect achieved by the extrusion device 100 on the extruded members C during the extrusion process can reduce damage to the extruded member C caused by the extrusion device 100, thereby preserving the bonding strength of the extruded member C to a certain extent, and further improving the problem of poor shaping and bonding of the extruded member C caused by the destruction of the bonding strength after extrusion.

[0114] Based on this, when the extrusion device 100 is used to extrude the electrode A and the diaphragm B, the air avoidance groove 40 can partially avoid the diaphragm B passing through the extrusion gap 30, so that the first extrusion member 10 and the second extrusion member 20 only locally extrude the diaphragm B. This can reduce the extrusion damage to the diaphragm B by the extrusion device 100, so that after the extrusion operation, the bonding force of the avoided part of the diaphragm B can be retained, and then it can play a sticky role in the subsequent shaping operation, thereby improving the problem of poor bonding of the electrode assembly, which helps to improve the quality of the electrode assembly.

[0115] In addition, by locally avoiding the extruded part C through the avoidance groove 40, the damage to the diaphragm B caused by the extrusion effect of the first extrusion part 10 and the second extrusion part 20 can be reduced. In this way, the electrode assembly formed by the shaping can have a higher short-circuit test quality rate, and the damage to the diaphragm B can be avoided as much as possible, which will cause the pole pieces A (that is, the positive pole piece and the negative pole piece) on both sides of the diaphragm B to be conductive.

[0116] In some embodiments, as shown in Figures 2, 5, and 7, the first surface 101 is a cylindrical surface. In other embodiments, as shown in Figures 6 and 8, the first surface 101 is a plane.

[0117] In some embodiments, as shown in Figures 2 and 5 , the second surface 201 is a cylindrical surface. In other embodiments, as shown in Figures 6 , 7 and 9 , the second surface 201 is a plane.

[0118] As shown in Figures 2, 5 and 7, when the first surface 101 is a cylindrical surface, the first extrusion member 10 can be a roller-shaped structure, and the first surface 101 is provided on the outer peripheral surface of the first extrusion member 10. The first surface 101 is the surface of the outer peripheral surface of the first extrusion member 10 excluding the air-avoidance groove 40, that is, the first surface 101 is a portion of the outer peripheral surface of the first extrusion member 10. Based on this, the first extrusion member 10 can rotate around its rotation axis, so that it can rotate during the process of extruding the extruded member C to achieve rolling of the extruded member C. The rotation axis of the first extrusion member 10 is parallel to the direction Y shown in the figure. Of course, the first extrusion member 10 may not rotate.

[0119] As shown in Figures 6 and 8, when the first surface 101 is a plane, the first surface 101 refers to the portion of the surface of the first extrusion member 10 facing the second extrusion member 20 excluding the air-avoidance groove 40, that is, the first surface 101 is one portion of the side of the first extrusion member 10 used to extrude the extruded member C. In other words, the portion of the side of the first extrusion member 10 used to form the extrusion gap 30 with the second extrusion member 20 excluding the air-avoidance groove 40.

[0120] Accordingly, the second surface 201 refers to the surface of the second extrusion member 20 used to extrude the extruded member C. The specific definition of the second surface 201 can be explained in the same way as the first surface 101. Based on the configuration of the second surface 201, the specific structure of the second extrusion member 20 can also be similar to that of the first extrusion member 10, and will not be repeated here.

[0121] As shown in Figures 2 and 8 , when the first surface 101 has the aforementioned air escape groove 40, the opening of the air escape groove 40 specifically extends to the first surface 101, thereby exposing the air escape groove 40 to the first surface 101. It will be understood that the air escape groove 40 and the first surface 101 are disposed adjacent to each other, such that the first surface 101 defines the opening of the air escape groove 40. When the second surface 201 has the aforementioned air escape groove 40, the specific relationship between the air escape groove 40 of the second extrusion member 20 and the second surface 201 can be explained in the same manner as the specific relationship between the air escape groove 40 of the first extrusion member 10 and the first surface 101, and will not be repeated here.

[0122] As shown in Figures 4 to 7 , when the extruded member C passes through the extrusion gap 30, such that the first surface 101 and the second surface 201 cooperate to extrude the extruded member C, the extruded member C is attached to the first surface 101 and the second surface 201 on both sides along a predetermined direction. The first extrusion member 10 extrudes one side of the extruded member C via the first surface 101, and the second extrusion member 20 extrudes the other side of the extruded member C via the second surface 201. Furthermore, at least a portion of the extruded member C covers the opening of the air avoidance groove 40, directly facing the air avoidance groove 40, thereby being protected from air by the air avoidance groove 40.

[0123] In some embodiments, as shown in Figures 2 to 5 , the first extrusion 10 and the second extrusion 20 are both roller-shaped and rotatable, with the rotational axis of the first extrusion 10 and the rotational axis of the second extrusion 20 being parallel and parallel to the direction Y indicated in the figures. In this embodiment, the first surface 101 is provided on the outer circumference of the first extrusion 10, and the second surface 201 is provided on the outer circumference of the second extrusion 20. As the extruded part C passes through the extrusion gap 30, the first surface 101 of the first extrusion 10 and the second surface 201 of the second extrusion 20 respectively press on both sides of the extruded part C. Simultaneously, the first extrusion 10 and the second extrusion 20 can also rotate to accommodate the conveyance of the extruded part C, such that the rotational direction of the first extrusion 10 and the rotational direction of the second extrusion 20 are opposite (for example, the first extrusion 10 rotates clockwise and the second extrusion 20 rotates counterclockwise, or the first extrusion 10 rotates counterclockwise and the second extrusion 20 rotates clockwise). In this way, the first extrusion member 10 and the second extrusion member 20 can adapt to the conveyance of the extruded member C (in the direction X shown in the figure) during the process of extruding the extruded member C toward each other, and can also jointly realize the rolling of the extruded member C, so that the extruded member C can pass through the extrusion gap 30 in a direction while being extruded, thereby realizing the rolling effect on the extruded member C. In other words, the extruded member C can be rolled by the first extrusion member 10 and the second extrusion member 20 while being conveyed, so that the extrusion device 100 has a high rolling efficiency for the extruded member C.

[0124] In other embodiments, as shown in Figures 6, 8, and 9, the first surface 101 of the first extruded member 10 and the second surface 201 of the second extruded member 20 can both be planes. Therefore, the first surface 101 is located on the side of the first extruded member 10 facing the second extruded member 20, and the second surface 201 is located on the side of the second extruded member 20 facing the first extruded member 10. Therefore, the first extruded member 10 and the second extruded member 20 cannot perform a rolling action on the extruded member C.

[0125] Based on this, in some implementations, while the extruded part C passes through the extrusion gap 30, the first extrusion part 10 and the second extrusion part 20 can move toward each other to respectively squeeze the two sides of the extruded part C, thereby achieving an extrusion effect on the extruded part C. The extruded part C needs to stop being conveyed so that the first surface 101 of the first extrusion part 10 and the second surface 201 of the second extrusion part 20 can squeeze the extruded part C. Subsequently, the first extrusion part 10 and the second extrusion part 20 move away from each other so that the first surface 101 and the second surface 201 release the extruded part C. At this point, the extruded part C can continue to be conveyed, so that the extruded portion of the extruded part C can leave the extrusion device 100, so that the next portion of the extruded part C can be extruded through the extrusion gap 30.

[0126] In other implementations, the first surface 101 of the first extrusion member 10 and the second surface 201 of the second extrusion member 20 can both be in sliding contact with the extruded member C. During the process of the extruded member C passing through the extrusion gap 30, the extruded member C slides relative to the first surface 101 and the second surface 201, so that the extruded member C can smoothly pass through the extrusion gap 30. Thus, the effect of the extruded member C being extruded while being transported is achieved. It should be added that, under this implementation, there are high requirements for the conveying force of the extruded member C and the relative sliding of the extruded member C with the first surface 101 and the second surface 201, respectively. Specifically, the extruded member C needs to be squeezed by the first surface 101 and the second surface 201 during the conveying process, and can also slide relative to the first surface 101 and the second surface 201 at the same time. In this way, the extruded member C is inevitably at risk of breaking under the extrusion of the first surface 101 and the second surface 201. Therefore, the situation in which the first extrusion member 10 and the second extrusion member 20 can move toward and away from each other is more conducive to the protection of the extruded member C. However, since the extruded member C needs to be frequently started and stopped for transportation, the extrusion efficiency is low.

[0127] In yet other embodiments, as shown in Figures 7 and 9 , the first extrusion member 10 is rotatable and has a first surface 101 disposed on the outer circumference of the first extrusion member 10. Furthermore, the second surface 201 of the second extrusion member 20 is planar and disposed on the side of the second extrusion member 20 facing the first extrusion member 10, in sliding contact with the extruded member C. Consequently, as the extruded member C passes through the extrusion gap 30, the first extrusion member 10 and the second extrusion member 20 compress the extruded member C via the first surface 101 and the second surface 201, respectively. During this process, the first extrusion member 10 is able to rotate to accommodate the conveyance of the extruded member C, thereby simultaneously squeezing and rolling the extruded member C, thereby achieving a rolling effect on the extruded member C. Furthermore, the extruded member C also slides relative to the second extrusion member 20. This arrangement also achieves the effect of simultaneously extruding the extruded member C while being conveyed.

[0128] By adopting the above technical solution, the surface of the first extrusion member 10 used to extrude the extruded member C can be a plane or a cylindrical surface, and the surface of the second extrusion member 20 used to extrude the extruded member C can also be a plane or a cylindrical surface. In this way, the first extrusion member 10 and the second extrusion member 20 can extrude the extruded member C in various forms, thus providing the first extrusion member 10 and the second extrusion member 20 with high design flexibility.

[0129] In some embodiments, referring to FIG. 2 and FIG. 10 , when the first surface 101 defines a clearance groove 40 , the groove wall of the clearance groove 40 transitions to the first surface 101 in an arc shape. When the second surface 201 defines a clearance groove 40 , the groove wall of the clearance groove 40 transitions to the second surface 201 in an arc shape.

[0130] As shown in Figure 10, Figure 10 shows a partial schematic diagram of the first extrusion member 10. When the first extrusion member 10 is used to extrude the first surface 101 of the extruded member C and is provided with the above-mentioned avoidance groove 40, the connection position between the groove wall of the avoidance groove 40 and the first surface 101 is provided with a rounded corner 402 to achieve a circular arc transition between the groove wall of the avoidance groove 40 and the first surface 101, thereby improving the problem of the sharp connection between the first surface 101 and the inner side wall of the avoidance groove 40. Correspondingly, when the second extrusion member 20 is used to extrude the second surface 201 of the extruded member C and is provided with the above-mentioned avoidance groove 40, the connection position between the groove wall of the avoidance groove 40 and the second surface 201 can also be provided with a rounded corner 402 to achieve a circular arc transition between the groove wall of the avoidance groove 40 and the second surface 201.

[0131] By adopting the above technical solution, the problem of the sharp opening of the air-avoiding groove 40 can be improved, and the problem of the extruded part C being punctured can be improved, so that the conveying and extrusion of the extruded part C can be smoothly realized.

[0132] In some embodiments, referring to FIG. 2 , FIG. 3 , FIG. 8 and FIG. 19 , the first surface 101 is provided with a plurality of the aforementioned air-avoiding grooves 40 , and the plurality of air-avoiding grooves 40 on the first surface 101 are distributed at intervals.

[0133] In some other embodiments, please refer to FIG. 9 and FIG. 19 , the second surface 201 is provided with a plurality of the aforementioned air-avoiding grooves 40 , and the plurality of air-avoiding grooves 40 on the second surface 201 are distributed at intervals.

[0134] In some other embodiments, both the first surface 101 and the second surface 201 are provided with a plurality of the aforementioned air-avoiding grooves 40 . The plurality of air-avoiding grooves 40 on the first surface 101 are distributed at intervals, and the plurality of air-avoiding grooves 40 on the second surface 201 are distributed at intervals.

[0135] By adopting the above technical solution, the plurality of air-avoiding grooves 40 on the first surface 101 are spaced apart, and / or the plurality of air-avoiding grooves 40 on the second surface 201 are spaced apart. Based on this, the air-avoiding grooves 40 can be formed by forming a depression in the first surface 101 or the second surface 201. In other words, only a simple treatment of the first extrusion member 10 and / or the second extrusion member 20 is required to achieve the local air-avoiding effect of the extrusion device 100 on the diaphragm B and to achieve local extrusion of the diaphragm B, thereby improving the problem of decreased plastic bonding strength of the diaphragm B and damage to the diaphragm B due to extrusion.

[0136] In some embodiments, referring to FIG. 2 , FIG. 3 , FIG. 8 and FIG. 19 , there are a plurality of air-avoiding grooves 40 on the first surface 101 , and the plurality of air-avoiding grooves 40 are evenly distributed on the first surface 101 .

[0137] By adopting the above technical solution, the multiple air-avoiding grooves 40 of the first surface 101 can be evenly distributed on the first surface 101. In the process of the extruded part C passing through the extrusion gap 30, the multiple air-avoiding grooves 40 can achieve the air-avoiding effect of the multiple evenly distributed parts of the extruded part C, that is, the air-avoided parts of the extruded part C are evenly distributed. Correspondingly, the extrusion device 100 can extrude the multiple evenly distributed parts of the extruded part C, that is, the extruded parts of the extruded part C are evenly distributed. Based on this, when the extrusion device 100 is used to extrude the diaphragm B and the electrode A, the extrusion device 100 can extrude the multiple evenly distributed parts of the diaphragm B, so that the diaphragm B can achieve a better bonding effect with the electrode A, that is, the diaphragm B can have a better composite bonding force. In addition, the extrusion device 100 can also achieve the air-avoiding effect of the multiple evenly distributed parts of the diaphragm B, so that the bonding force of the multiple evenly distributed parts of the diaphragm B is retained, thereby making the diaphragm B have a better shaping bonding force. When the composite electrode formed by squeezing the electrode A and the diaphragm B is shaped, the avoided portion of the diaphragm B can better achieve the bonding effect of the electrode assembly, thereby making the electrode assembly have better quality.

[0138] In some embodiments, as shown in FIG. 9 and FIG. 19 , when the second surface 201 of the second extrusion member 20 is provided with a plurality of the aforementioned air-avoiding grooves 40 , the plurality of air-avoiding grooves 40 are evenly distributed on the second surface 201 .

[0139] By adopting the above technical solution, a uniform extrusion effect on the extruded part C can also be achieved, thereby enabling the diaphragm B to have better composite bonding strength and shaping bonding strength, thereby enabling the electrode assembly to have higher quality.

[0140] In some embodiments, referring to Figures 2, 3, 11, 12, and 19, when the first surface 101 has a plurality of air gaps 40, the center points of the plurality of air gaps 40 can be connected to form a grid structure D, and the smallest grid unit D1 of the grid structure D is an equilateral triangle, thereby achieving a uniform distribution of the plurality of air gaps 40 on the first surface 101. Correspondingly, when the second surface 201 has a plurality of air gaps 40, the center points of the plurality of air gaps 40 can also be connected to form a grid structure D, and the smallest grid unit D1 of the grid structure D is an equilateral triangle, thereby achieving a uniform distribution of the plurality of air gaps 40 on the second surface 201.

[0141] The center point of the air-avoiding groove 40 refers to the approximate center position of the opening of the air-avoiding groove 40 .

[0142] As shown in Figures 3, 11, and 12, taking the first surface 101 provided with a plurality of air-avoiding grooves 40 as an example, the plurality of air-avoiding grooves 40 form a plurality of rows of air-avoiding grooves 40. When the first extrusion member 10 is in the shape of a roller, as shown in Figures 2, 3, 11, and 12, the plurality of rows of air-avoiding grooves 40 are evenly distributed along the circumferential direction on the outer circumference of the first extrusion member 10; when the first surface 101 is a plane, the plurality of rows of air-avoiding grooves 40 are evenly distributed along direction X on the side of the first extrusion member 10 used for extruding the extruded member C. Each row of air-avoiding grooves 40 includes a plurality of air-avoiding grooves 40 spaced apart along direction Y, and in the distribution direction (direction Y) of each row of air-avoiding grooves 40, the air-avoiding grooves 40 of two adjacent rows of air-avoiding grooves 40 are alternately distributed. Specifically, the distribution of the two rows of air avoidance grooves 40 (the first row of air avoidance grooves 40 and the second row of air avoidance grooves 40) is as follows. In the direction Y, the air avoidance grooves 40 are distributed according to the first air avoidance groove 40 of the first row of air avoidance grooves 40, the first air avoidance groove 40 of the second row of air avoidance grooves 40, the second air avoidance groove 40 of the first row of air avoidance grooves 40, and so on.

[0143] Based on this, when the center points of two adjacent air-avoiding grooves 40 are connected, multiple air-avoiding grooves 40 can form a grid structure D through the connected line segment D2, as shown in FIG12 , FIG12 shows a schematic diagram of multiple air-avoiding grooves 40 on the first extrusion member 10 connected by the line segment D2 to form a grid structure D. Among them, in two adjacent air-avoiding grooves 40, one end of the line segment D2 is connected to the center point of one of the air-avoiding grooves 40, and the other end of the line segment D2 is connected to the center point of the other air-avoiding groove 40. As can be seen from FIG12 , the grid unit D includes multiple grid units D1, and the smallest grid unit D1 is an equilateral triangle, thereby achieving a uniform distribution of multiple air-avoiding grooves 40.

[0144] Correspondingly, when the second surface 201 is provided with a plurality of air-avoiding grooves 40 , the distribution of the plurality of air-avoiding grooves 40 may also refer to the distribution of the plurality of air-avoiding grooves 40 on the first surface 101 , which will not be repeated here.

[0145] By adopting the above technical solution, the air avoidance grooves 40 in any two adjacent rows of air avoidance grooves 40 are alternately distributed along the direction Y, so that more parts of the extruded component C are avoided along the direction Y and the conveying direction of the extruded component C, that is, the parts of the extruded component C that are avoided are distributed more densely along the direction Y and the conveying direction of the extruded component C, so that the diaphragm B can have better composite bonding force to combine the electrode piece A and the diaphragm B to form a composite electrode piece, and the diaphragm B also has better shaping bonding force to shape the composite electrode piece to form an electrode assembly.

[0146] In other embodiments, as shown in FIG8 , when the first surface 101 is provided with a plurality of air gaps 40, the plurality of air gaps 40 may be arranged in an array along two different directions, thereby achieving a uniform distribution of the plurality of air gaps 40. When the first extruded member 10 is in the form of a roller, the plurality of air gaps 40 are arranged in an array along the circumferential direction and direction Y of the first extruded member 10. When the first surface 101 is planar, as shown in FIG8 , the plurality of air gaps 40 are arranged in an array along directions Y and X.

[0147] Correspondingly, when the second extrusion component 20 is provided with a plurality of air avoidance grooves 40, as shown in FIG9 , the plurality of air avoidance grooves 40 can also be distributed in an array along two different directions, thereby achieving a uniform distribution of the plurality of air avoidance grooves 40. For details, please refer to the distribution method of the plurality of air avoidance grooves 40 on the first extrusion component 10, which will not be repeated here.

[0148] Based on the above structure, it can be understood that when multiple air avoidance grooves 40 are only provided on the first surface member 101, as shown in Figures 2, 3 and 12, the center points of the multiple air avoidance grooves 40 can form a grid structure D, and the smallest grid unit D1 of the grid structure D is an equilateral triangle.

[0149] When both the first surface 101 and the second surface 201 are provided with a plurality of air-avoiding grooves 40, in some embodiments, the plurality of air-avoiding grooves 40 provided on the first surface 101 may be arranged such that the center points of the plurality of air-avoiding grooves 40 are connected to form a grid structure D, with the smallest grid unit D1 of the grid structure D being an equilateral triangle. Furthermore, the plurality of air-avoiding grooves 40 provided on the second surface 201 may be arranged in an array along two different directions. Alternatively, in other embodiments, the plurality of air-avoiding grooves 40 provided on the first surface 101 may be arranged such that the center points of the plurality of air-avoiding grooves 40 are connected to form a grid structure D, with the smallest grid unit D1 of the grid structure D being an equilateral triangle. Furthermore, the plurality of air-avoiding grooves 40 provided on the second surface 201 may be arranged such that the center points of the plurality of air-avoiding grooves 40 are connected to form a grid structure D, with the smallest grid unit D1 of the grid structure D being an equilateral triangle. Alternatively, in some other embodiments, the plurality of air-avoiding grooves 40 opened on the first surface 101 are distributed in arrays along two different directions, and the plurality of air-avoiding grooves 40 opened on the second surface 201 are distributed in arrays along two different directions.

[0150] In some embodiments, please refer to Figures 13 and 14 together. The air avoidance groove 40 includes multiple first grooves 401 and multiple second grooves 403. A second groove 403 can be set between two adjacent first grooves 401, and the two adjacent first grooves 401 are connected through the second groove 403.

[0151] In this embodiment, the number of the air-avoiding grooves 40 can be one or more.

[0152] As shown in Figures 13 and 14, both Figures 13 and 14 show schematic diagrams of the first extrusion 10. Taking the first extrusion 10 as an example, in which a plurality of first grooves 401 and second grooves 403 are provided, a second groove 403 is provided between two adjacent first grooves 401, so that the plurality of first grooves 401 and the plurality of second grooves 403 are sequentially connected. In this way, the first grooves 401 and the second grooves 403 can divide the first surface 101 into a plurality of discontinuous parts, that is, the first surface 101 is a discontinuous surface. Of course, in other embodiments, the provision of the second grooves 403 can also achieve communication between only some of the first grooves 401, and some of the first grooves 401 can also be spaced apart. In this case, the first surface 101 can still be a continuous surface.

[0153] By adopting the above technical solution, when the first extrusion member 10 is provided, a plurality of first grooves 401 and a plurality of second grooves 403 can be directly opened on the first surface 101 of the first extrusion member 10 .

[0154] Alternatively, the base 11 of the first extruded member 10 can be fabricated first, and then multiple extrusion portions 12 can be disposed on the base 11 at intervals, so that the multiple extrusion portions 12 can form the aforementioned multiple first grooves 401 and multiple second grooves 403. In this case, all first grooves 401 and all second grooves 403 are connected. In this case, the first extruded member 10 extrudes the extruded member C through the extrusion portions 12, and the surfaces of the multiple extrusion portions 12 facing away from the base 11 form the first surface 101. This arrangement makes the molding process of the first extruded member 10 very flexible and easy to implement.

[0155] Correspondingly, when the second surface 201 of the second extruded member 20 defines a plurality of first grooves 401, the second surface 201 may also define a plurality of second grooves 403. The relationship between the second grooves 403 and the first grooves 401 in the second extruded member 20 can be seen in the relationship between the second grooves 403 and the first grooves 401 in Figures 13 and 14 , and will not be repeated here. This allows for a highly flexible and easily implemented molding process for the second extruded member 20.

[0156] In some embodiments, referring to Figures 2, 3, and 8, when the first surface 101 has a cavity 40, the contour of the cavity 40 on the first surface 101 is circular, although it can also be elliptical, square, or other shapes. As shown in Figure 9, when the second surface 201 has a cavity 40, the contour of the cavity 40 on the second surface 201 is circular, although it can also be elliptical, square, or other shapes.

[0157] Take the air avoidance groove 40 on the first surface 101 as an example: as shown in Figures 8 and 9, the outline of the air avoidance groove 40 on the first surface 101 is circular, which means that the outline of the opening of the air avoidance groove 40 is circular, that is, the opening outline of the air avoidance groove 40 defined by the first surface 101 is circular.

[0158] Correspondingly, the contour of the avoidance groove 40 on the first surface 101 is oval, square, etc., which can be interpreted in the same way. The contour of the avoidance groove 40 on the second surface 201 is circular, oval, square, etc., which can be interpreted in the same way.

[0159] By adopting the above technical solution, the outline of the air-avoiding groove 40 on the first surface 101 and / or the second surface 201 can be circular, elliptical, square or other shapes, making the design of the air-avoiding groove 40 very flexible and easy to implement.

[0160] In addition, when the first extrusion member 10 is roller-shaped and has the avoidance groove 40 , the avoidance groove 40 can also be spirally shaped. Specifically, the avoidance groove 40 is spirally wound around the outer circumference of the first extrusion member 10 with the rotation axis of the first extrusion member 10 as the axis.

[0161] In some embodiments, referring to FIG. 2 and FIG. 15 , the air-avoiding groove 40 is configured such that the ratio of the area of ​​the portion of the extruded component C facing the air-avoiding groove 40 to the area of ​​the extruded component C is in a range of 30% to 40%.

[0162] The area of ​​the portion of the extruded part C facing the air-avoidance groove 40 refers to the area of ​​one side of the portion of the extruded part C facing the air-avoidance groove 40 along the predetermined direction. The area of ​​the extruded part C refers to the area of ​​one side of the extruded part C along the predetermined direction. Correspondingly, the area of ​​the portion of the diaphragm B facing the air-avoidance groove 40 below also refers to the area of ​​one side of the diaphragm B and the air-avoidance groove 40 along the predetermined direction, and the area of ​​the diaphragm B refers to the area of ​​one side of the diaphragm B along the predetermined direction. When the extruded part C is a sheet material, the predetermined direction is the thickness direction. For the convenience of description, the following description will be made by taking the predetermined direction as the thickness direction as an example, but the thickness direction should be the extrusion direction of the extruded part C.

[0163] During the process of the extruded member C passing through the extrusion gap 30, one or both sides of a portion of the extruded member C face the avoidance groove 40 to be avoided by the avoidance groove 40. The area of ​​one side of this portion of the extruded member C along the thickness direction accounts for 30% to 40% of the area of ​​one side of the extruded member C along the thickness direction. The portion of the extruded member C that does not face the avoidance groove 40 is extruded by the first extrusion member 10 and the second extrusion member 20. The area of ​​one side of this portion of the extruded member C accounts for 60% to 70% of the area of ​​one side of the extruded member C.

[0164] When the extrusion device 100 is used to extrude the electrode piece A and the diaphragm B, during the process of the electrode piece A and the diaphragm B passing through the extrusion gap 30, a portion of the diaphragm B is shielded by the shielding groove 40, and the area of ​​one side of the shielded portion of the diaphragm B accounts for 30% to 40% of the area of ​​the one side of the diaphragm B. The other portion of the diaphragm B is extruded by the first extrusion member 10 and the second extrusion member 20, and the area of ​​one side of the extruded portion of the diaphragm B accounts for 60% to 70% of the area of ​​the one side of the diaphragm B. Based on this, it can be understood that when the electrode piece A and the diaphragm B are combined to form a composite electrode piece, the diaphragm B is bonded to the electrode piece A through 60% to 70% of the bonding points thereon, thereby achieving a composite bonding of the diaphragm B and the electrode piece A. When the composite electrode piece formed by the electrode piece A and the diaphragm B is shaped to form an electrode assembly, the remaining 30% to 40% of the bonding points on the diaphragm B are again bonded to the electrode piece A, thereby achieving the shaping and bonding of the electrode assembly.

[0165] It should be noted that when the diaphragm B and the electrode piece A are stacked, before the diaphragm B and the electrode piece A are squeezed, there is no adhesion between the diaphragm B and the electrode piece A, that is, the bonding points of the diaphragm B have not failed. Alternatively, the diaphragm B and the electrode piece A are bonded, but the degree of this bonding has little effect on the bonding between the diaphragm B and the electrode piece A during the subsequent shaping operation. That is, at this time, the number of bonding points of the diaphragm B used to bond to the electrode piece A is relatively small. After the diaphragm B is squeezed by the squeezing device 100, the diaphragm B still has 30% to 40% of the bonding points, so that the diaphragm B still has a strong shaping bonding force.

[0166] As shown in FIG15 , FIG15 shows the relationship curves of the air avoidance ratio of the diaphragm B and the composite bonding force of the diaphragm B and the shaping bonding force of the diaphragm B respectively.

[0167] The air avoidance ratio of the diaphragm B refers to the ratio of the area of ​​the part of the diaphragm B facing the air avoidance groove 40 to the area of ​​the diaphragm B, that is, the ratio of the area of ​​one side of the air avoided part of the diaphragm B to the area of ​​one side of the diaphragm B. It can also be defined as the air avoidance ratio of the extruded part C below.

[0168] The relationship curve L1 shown in Figure 15 shows the relationship between the gap ratio of separator B and the composite bonding strength of separator B. As the gap ratio of separator B increases, the composite bonding strength of separator B decreases. The relationship curve L2 shown in Figure 15 shows the relationship between the gap ratio of separator B and the shaping bonding strength of separator B. As the gap ratio of separator B increases, the composite bonding strength of separator B increases. As can be seen from the figure, when the gap ratio of separator B is between 30% and 40%, the corresponding composite bonding strength range can meet the requirements of extruding separator B and electrode sheet A to form a composite electrode sheet, that is, ensuring that the composite electrode sheet has good bonding reliability and meets the quality requirements of the composite electrode sheet. Furthermore, the corresponding shaping bonding strength also meets the requirements of shaping the composite electrode sheet to form an electrode assembly, that is, ensuring that the electrode assembly has good bonding reliability and meets the quality requirements of the electrode assembly. Therefore, in this embodiment, the gap ratio of the extruded part C can be set to 30% to 40%.

[0169] By adopting the above technical solution, the air avoidance ratio of the extruded part C is 30% to 40%, so that the composite bonding force of the diaphragm B can meet the bonding reliability requirements of the composite electrode, and the shaping bonding force of the diaphragm B can also meet the bonding reliability requirements of the electrode assembly, thereby helping to improve the quality of the electrode assembly.

[0170] In some embodiments, referring to Figures 2, 3, 8, 15, and 19, the air-avoiding groove 40 is disposed on the first surface 101, and the ratio of the first area to the second area of ​​the air-avoiding groove 40 on the first surface 101 is in a range of 30% to 40%. The second area is the sum of the first area and the area of ​​the first surface 101.

[0171] As shown in Figure 8, when the first surface 101 is a plane, the first surface 101 refers to the surface of the first extrusion member 10 facing the second extrusion member 20 after the first extrusion member 10 is provided with the avoidance groove 40, excluding the avoidance groove 40. In this case, the second area refers to the area of ​​the first extrusion member 10 facing the second extrusion member 20 before the avoidance groove 40 is provided. As shown in Figures 2 and 3, when the first surface 101 is a cylindrical surface, the first surface 101 refers to the surface of the outer peripheral surface of the first extrusion member 10 after the first extrusion member 10 is provided with the avoidance groove 40, excluding the avoidance groove 40. In this case, the second area refers to the area of ​​the outer peripheral surface of the first extrusion member 10 before the avoidance groove 40 is provided.

[0172] The first area of ​​the air-avoiding groove 40 on the first surface 101 refers to the area of ​​the pattern defined by the opening outline of the air-avoiding groove 40. The first area is the difference between the second area and the area of ​​the first surface 101.

[0173] The ratio of the first area to the second area may be considered as the air avoidance ratio of the first extrusion component 10 , the air avoidance ratio of the air avoidance groove 40 , or the air avoidance ratio of the extrusion device 100 .

[0174] By adopting the above technical solution, when the air avoidance groove 40 is only provided in the first extrusion part 10, the air avoidance ratio of the first extrusion part 10 is in the range of 30% to 40%. With such a setting, when the extruded part C passes through the extrusion gap 30, the extruded part C is avoided by the air avoidance groove 40, so that the extruded part C has an air avoidance ratio of 30% to 40%. In other words, the setting of the air avoidance ratio of the first extrusion part 10 can enable the extruded part C to also obtain a corresponding air avoidance ratio. With such a setting, when the extrusion device 100 is used to extrude the diaphragm B and the electrode A, the diaphragm B can have better composite bonding force and shaping bonding force, thereby improving the problem of poor shaping bonding and improving the quality of the electrode assembly.

[0175] In other embodiments, both the first extrusion member 10 and the second extrusion member 20 are provided with a gas avoidance groove 40. Here, the area of ​​the surface of the first extrusion member 10 used to extrude the extruded member C before the gas avoidance groove 40 is provided is first defined as S1, and the area S1 here is the second area in the above embodiment. In addition, the area of ​​the surface of the second extrusion member 20 used to extrude the extruded member C before the gas avoidance groove 40 is provided is also defined as S2. The area S2 here can also refer to the definition of the second area. In addition, the area of ​​the gas avoidance groove 40 of the first extrusion member 10 on the first surface 101 is defined as S3, and the area of ​​the gas avoidance groove 40 of the second extrusion member 20 on the second surface 201 is defined as S4.

[0176] Based on this, area S1 and area S2 can be the same. When the air escape groove 40 of the first extrusion member 10 and the air escape groove 40 of the second extrusion member 20 are staggered in their corresponding extrusion positions on the extruded member C, the air escape ratio of the extruded member C can be the ratio of the sum of area S3 and area S4 to area S1, and the ratio range is 30% to 40%. When the air escape groove 40 of the first extrusion member 10 and the air escape groove 40 of the second extrusion member 20 overlap in their corresponding extrusion positions on the extruded member C, the area of ​​the overlapping portion of the air escape groove 40 of the first extrusion member 10 and the air escape groove 40 of the second extrusion member 20 corresponding to the extrusion position on the extruded member C is first defined as S5. The air escape ratio of the extruded member C can be the ratio of the value obtained by subtracting area S5 from the sum of area S3 and area S4 to area S1, and the ratio range is 30% to 40%.

[0177] The avoidance groove 40 of the first extrusion member 10 and the avoidance groove 40 of the second extrusion member 20 are staggered in their corresponding extrusion positions on the extruded member C, which means that when the extruded member C passes through the extrusion gap 30, so that the first extrusion member 10 and the second extrusion member 20 cooperate to extrude the extruded member C, the portion of the extruded member C avoided by the avoidance groove 40 of the first extrusion member 10 and the portion avoided by the avoidance groove 40 of the second extrusion member 20 do not overlap. Accordingly, when the avoidance groove 40 of the first extrusion member 10 and the avoidance groove 40 of the second extrusion member 20 overlap in their corresponding extrusion positions on the extruded member C, the portion of the extruded member C avoided by the avoidance groove 40 of the first extrusion member 10 and the portion avoided by the avoidance groove 40 of the second extrusion member 20 overlap, that is, at least part of the extruded member C is avoided by both the avoidance groove 40 of the first extrusion member 10 and the avoidance groove 40 of the second extrusion member 20.

[0178] Area S1 may also be smaller than area S2. At this time, a continuous portion E may be divided in the second extrusion 20, in which the area of ​​the air avoidance groove 40 on the second surface 201 is S6, as shown in FIG16 , which shows a front view of the first extrusion 10 and the second extrusion 20 in some embodiments. Part E is the portion of the second extrusion 20 that is opposite to the first extrusion 10, that is, the portion in which the second extrusion 20 can cooperate with the first extrusion 10 to extrude the extruded part C. Based on this, when the air avoidance groove 40 of the first extrusion 10 and the air avoidance groove 40 of part E are staggered with respect to the extrusion positions on the extruded part C, the air avoidance ratio of the extruded part C can be the ratio of the sum of area S3 and area S6 to area S1, and the ratio range is 30% to 40%. When the air avoidance groove 40 of the first extruded part 10 and the air avoidance groove 40 of part E overlap at the extrusion position corresponding to the extrusion position on the extruded part C, the area of ​​the overlapping part of the air avoidance groove 40 of the first extruded part 10 and the air avoidance groove 40 of part E at the extrusion position corresponding to the extrusion position on the extruded part C is defined as S7. The air avoidance ratio of the extruded part C can be the ratio of the value obtained by subtracting the area S7 from the sum of the area S3 and the area S6 to the area S1, and the ratio range is 30% to 40%.

[0179] In some embodiments, referring to FIG. 2 , FIG. 3 , FIG. 10 , FIG. 17 and FIG. 19 , the depth of the air-avoiding groove 40 is greater than 40 μm.

[0180] As shown in Figure 10 , taking the example of a first extrusion member 10 having a groove 40 formed therein, the depth of the groove 40 refers to the distance between the bottom of the groove 40 and the first surface 101, as indicated by dimension H. This dimension H can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc. Accordingly, when the second extrusion member 20 also has a groove 40 formed therein, the depth of the groove 40 can also be greater than 40 μm.

[0181] As shown in Figure 17, Figure 17 shows a graph showing the relationship between the depth of the air-avoiding groove 40 and the composite bonding strength of the diaphragm B. According to the graph showing the relationship between the depth of the air-avoiding groove 40 and the composite bonding strength of the diaphragm B, when the depth of the air-avoiding groove 40 is greater than 40 μm, the diaphragm B has better composite bonding strength, thereby making the formed composite electrode sheet have better quality.

[0182] The composite bonding force shown in FIG17 specifically refers to the peeling force between the diaphragm B and the electrode A at every 20 mm.

[0183] By adopting the above technical solution, the depth of the air-avoiding groove 40 is made greater than 40 μm, so that the diaphragm B has a better ability to combine the diaphragm B and the electrode A to form a composite electrode, that is, it has a better composite ability, so that the composite electrode has better quality.

[0184] In some embodiments, referring to FIG. 2 , FIG. 3 , FIG. 10 , FIG. 17 and FIG. 19 , the depth of the air-avoiding groove 40 is greater than 100 μm.

[0185] As shown in FIG17 , according to the relationship curve between the depth of the air-avoidance groove 40 and the composite bonding force of the diaphragm B, it can be seen that when the depth of the air-avoidance groove 40 is greater than 100 μm, the composite bonding force of the diaphragm B basically fluctuates at the highest value. It can be seen that the composite electrode formed by the diaphragm B and the electrode A at this time has better bonding reliability.

[0186] By adopting the above technical solution, the depth range of the air-avoiding groove 40 is made greater than 100 μm, which enables the composite electrode to have better bonding reliability, thereby meeting the quality requirements of the composite electrode.

[0187] In other embodiments, the first extrusion member 10 and the second extrusion member 20 are both provided with a clearance groove 40 , and the clearance groove 40 of the first extrusion member 10 and the clearance groove 40 of the second extrusion member 20 are staggered at their corresponding extrusion positions on the extruded member C.

[0188] It can be understood that when the extruded member C passes through the extrusion gap 30, so that the first extrusion member 10 and the second extrusion member 20 cooperate to extrude the extruded member C, the portion of the extruded member C that is shielded by the shielding groove 40 of the first extrusion member 10 and the portion of the extruded member C that is shielded by the shielding groove 40 of the second extrusion member 20 do not overlap. In other words, the shielding groove 40 of the first extrusion member 10 and the shielding groove 40 of the second extrusion member 20 shield different portions of the extruded member C.

[0189] For example, in some implementations, the plurality of air gaps 40 on the first extruded member 10 can be divided into a plurality of rows of air gaps 40, and the plurality of rows of air gaps 40 on the first extruded member 10 are spaced apart on the first extruded member 10 along direction Y. The plurality of air gaps 40 of the second extruded member 220 can be divided into a plurality of rows of air gaps 40, and the plurality of rows of air gaps 40 of the second extruded member 20 are spaced apart on the second extruded member 20 along direction Y. When the first extruded member 10 is in the shape of a roller, the plurality of air gaps 40 in each row of air gaps 40 of the first extruded member 10 are circumferentially distributed on the outer circumferential surface of the first extruded member 10; when the first surface 101 of the first extruded member 10 is a plane, as shown in FIG8 , the plurality of air gaps 40 in each row of air gaps 40 of the first extruded member 10 are spaced apart along direction X on the side of the first extruded member 10 used for extruding the extruded member C. When the second extruded member 20 is in the shape of a roller, the plurality of clearance grooves 40 in each row of clearance grooves 40 of the second extruded member 20 are spaced apart along the circumferential direction on the outer circumferential surface of the second extruded member 20. When the second surface 201 of the second extruded member 20 is planar, as shown in FIG9 , the plurality of clearance grooves 40 in each row of clearance grooves 40 of the second extruded member 20 are spaced apart along direction X on the side of the second extruded member 20 used to extrude the extruded member C. Furthermore, in direction Y, the plurality of clearance grooves 40 in each row of the first extruded member 10 and the plurality of clearance grooves 40 in each row of the second extruded member 20 are alternately arranged. This arrangement allows the plurality of clearance grooves 40 in the first extruded member 10 and the plurality of clearance grooves 40 in the second extruded member 20 to avoid each other.

[0190] In addition, the multiple avoidance grooves 40 on the first extrusion member 10 and the multiple avoidance grooves 40 on the second extrusion member 20 can also be distributed in other ways, as long as the avoidance grooves 40 of the first extrusion member 10 and the avoidance grooves 40 of the second extrusion member 20 can be avoided.

[0191] By adopting the above technical solution, the air-avoidance grooves 40 of the first extrusion member 10 and the air-avoidance grooves 40 of the second extrusion member 20 can respectively provide air-avoidance for different portions of the extruded part C. Thus, under the condition that the air-avoidance ratio of the extruded part C is predetermined, the number of air-avoidance grooves 40 on the first extrusion member 10 and the number of air-avoidance grooves 40 on the second extrusion member 20 can be reduced, thereby simplifying the manufacturing process of the first extrusion member 10 and the second extrusion member 20. In addition, by simultaneously designing the air-avoidance for the first extrusion member 10 and the second extrusion member 20, the difference in quality between the first extrusion member 10 and the second extrusion member 20 can be minimized, and the quality of the first extrusion member 10 and the second extrusion member 20 can even be made equal, thereby facilitating the stability of the extrusion effect of the first extrusion member 10 and the second extrusion member 20 on the extruded part C.

[0192] In some embodiments, referring to Figures 2 through 5 , both the first extrusion member 10 and the second extrusion member 20 are roller-shaped, that is, both are press rollers. Alternatively, in other embodiments, as shown in Figure 7 , only the first extrusion member 10 is a press roller. Alternatively, in still other embodiments, only the second extrusion member 20 is a press roller. The press rollers are rotatable about their rotational axes, and the aforementioned air-avoidance grooves 40 are provided on their outer circumferences.

[0193] The pressing roller is a roller-shaped structure, that is, a columnar structure.

[0194] By adopting the above technical solution, when at least one of the first extrusion member 10 and the second extrusion member 20 is a pressing roller, the pressing roller can press the extruded member C through its outer peripheral surface during the process of the extruded member C passing through the extrusion gap 30, and can adapt to the conveyance of the extruded member C by rotating, and can even realize rolling of the extruded member C by rotating. Based on this, a rolling effect on the extruded member C is achieved, so that the extruded member C can be conveyed while being rolled by the first extrusion member 10 and the second extrusion member 20, thereby enabling the extrusion device 100 to achieve high rolling efficiency for the extruded member C.

[0195] In some embodiments, please refer to FIG. 2 , FIG. 5 and FIG. 18 , the extrusion device 100 further includes a cleaning component 50 , and the cleaning component 50 is used to clean the pressing roller.

[0196] The cleaning component 50 refers to a component capable of cleaning the pressure roller. The specific structure of the cleaning component 50 can be referred to the description of each embodiment below, and will not be described in detail here.

[0197] It should be noted that, in some cases, during use of the extrusion device 100, dust and other residues may easily remain on the surface of the pressure roller. Furthermore, since the pressure roller includes the air escape groove 40, dust and other residues may also easily remain in the air escape groove 40 during use of the extrusion device 100. When the pressure roller presses the extruded part C, the residues may easily fall onto the extruded part C, inevitably creating the risk of damage to the extruded part C due to the residues.

[0198] By adopting the above technical solution and using the cleaning assembly 50 to clean the pressing roller, the residue on the pressing roller can be removed, thereby improving the problem of the residue damaging the extruded part C when the pressing roller presses the extruded part C.

[0199] In some embodiments, please refer to Figures 2, 5 and 18 together. The cleaning assembly 50 includes a dust box 52 and a cleaning piece 51. The dust box 52 is provided with a receiving groove 521, a dust collection bin 522 and a dust suction port 523. The dust suction port 523 is connected to the receiving groove 521 and the dust collection bin 522. The cleaning piece 51 is assembled in the receiving groove 521, and a portion of the cleaning piece 51 is exposed outside the receiving groove 521, and can be elastically supported and frictionally contacted with the outer peripheral surface of the pressure roller when the pressure roller rotates. The dust box 52 is used to be connected to an external exhaust device so that the residue on the cleaning piece 51 can enter the dust collection bin 522 through the dust suction port 523 under the action of the exhaust device.

[0200] The cleaning member 51 refers to a component with certain elastic properties. Based on this, the cleaning member 51 can elastically press against the outer peripheral surface of the pressure roller to extend into the air avoidance groove 40 of the pressure roller. When the pressure roller rotates, the pressure roller can move relative to the cleaning member 51. In this way, the cleaning member 51 can smoothly generate frictional contact with the outer peripheral surface of the pressure roller through its elastic properties, and clean the residues in the air avoidance groove 40 and on the surface of the pressure roller through the elastic force of the cleaning member 51 pressing against the pressure roller. For example, the cleaning member 51 can be a brush. A brush is a flexible member with soft hair and strong toughness, which is convenient for cleaning residues. For another example, the cleaning member 51 can also be, but is not limited to, a component such as a feather duster that can achieve a cleaning function through elastic properties.

[0201] As shown in FIG. 18 , the dust suction port 523 is formed in the wall of the receiving groove 521 and passes through the wall of the receiving groove 521 , so that the dust suction port 523 is connected to the dust suction bin 522 and the receiving groove 521 .

[0202] As shown in Figures 2, 5, and 18, the receiving groove 521 has an opening, and the opening of the receiving groove 521 is directly opposite the pressure roller. The cleaning member 51 is assembled in the receiving groove 521, and a portion of the cleaning member 51 is exposed outside the receiving groove 521 through the opening. In this way, the cleaning member 51 can elastically abut the outer circumference of the pressure roller through the opening of the receiving groove 521. When the pressure roller rotates, it can move relative to the cleaning member 51, so that the outer circumference of the pressure roller and the cleaning member 51 are in frictional contact, allowing the cleaning member 51 to clean residues on the pressure roller.

[0203] The exhaust device refers to a device with a certain suction force to be able to extract air. The exhaust device is connected to the dust box 52 and communicates with the dust bin 522. The exhaust device can be, but is not limited to, an exhaust fan, a vacuum cleaner, etc.

[0204] Based on the above structure, during the rotation of the pressure roller, the pressure roller moves relative to the cleaning member 51, and the outer peripheral surface of the pressure roller and the cleaning member 51 are elastically supported and frictionally contacted, so that the cleaning member 51 cleans the residue on the pressure roller. At the same time, the exhaust device is turned on and exhausts air, so that the air at the pressure roller flows along the receiving groove 521, the dust suction port 523, and the dust collection bin 522 in sequence, so that the residue swept by the cleaning member 51 passes through the receiving groove 521 and the dust suction port 523 in sequence and enters the dust collection bin 522 under the suction action of the exhaust device. Of course, by selecting the exhaust device, the exhaust device can also allow the residue to enter the exhaust device through the receiving groove 521, the dust suction port 523, and the dust collection bin 522 in sequence.

[0205] The opening of the receiving groove 521 is located on the side of the receiving groove 521 facing away from the dust collection bin 522, and the exhaust device is connected to the end of the dust collection bin 522 facing away from the receiving groove 521. This arrangement facilitates air flow along the receiving groove 521, the dust collection port 523, and the dust collection bin 522 in sequence, thereby facilitating the sequential passage of residues cleaned by the cleaning member 51 through the receiving groove 521, the dust collection port 523, and the dust collection bin 522.

[0206] By adopting the above-mentioned technical solution, in the process of the pressure roller pressing the extruded part C, the cleaning part 51 cleans the residue on the pressure roller, and the exhaust device can draw the residue cleaned by the cleaning part 51 to the dust collection bin 522 or the exhaust device, thereby realizing real-time cleaning of the pressure roller to improve the problem of residue damaging the extruded part C.

[0207] In other embodiments, the cleaning assembly may only include an exhaust device, that is, the exhaust device directly extracts the residue on the pressure roller to achieve cleaning of the pressure roller. However, in the above embodiment, the cleaning member 51 can be in frictional contact with the pressure roller, and the cleaning member 51 can move relative to the pressure roller during the rotation of the pressure roller to clean the residue on the pressure roller. This facilitates the exhaust device to extract the residue, and the cleaning effect on the pressure roller is higher.

[0208] In some embodiments, please refer to FIG. 2 , FIG. 5 and FIG. 18 , the cleaning member 51 is rotatable, and the rotation axis of the cleaning member 51 is parallel to the rotation axis of the pressure roller.

[0209] The cleaning member 51 is connected to an external driving device, and the external driving device can drive the cleaning member 51 to rotate around the rotation axis of the cleaning member 51.

[0210] Wherein, the cleaning member 51 is rotatably connected to the dust collection box 52. In addition, the cleaning member 51 is also rotatably connected to the external frame, thereby being able to rotate relative to the dust collection box 52.

[0211] In some implementations, the direction of rotation of the cleaning member 51 and the direction of rotation of the pressure roller can be the same, so that the portion of the cleaning member 51 in contact with the pressure roller and the portion of the pressure roller in contact with the cleaning member 51 can move relative to each other, that is, the cleaning member 51 can rotate relative to the pressure roller, so that the cleaning member 51 can clean the residue on the pressure roller. In other implementations, the direction of rotation of the cleaning member 51 and the direction of rotation of the pressure roller can be the same, and the linear speed of rotation of the cleaning member 51 and the linear speed of rotation of the pressure roller can be different, so that the portion of the cleaning member 51 in contact with the pressure roller and the portion of the pressure roller in contact with the cleaning member 51 can move relative to each other, that is, the cleaning member 51 can rotate relative to the pressure roller, so that the cleaning member 51 can clean the residue on the pressure roller.

[0212] The rotation axis of the cleaning member 51 is parallel to the rotation axis of the pressure roller, so that the outer peripheral surface of the cleaning member 51 can contact the outer peripheral surface of the pressure roller. After the cleaning member 51 rotates relative to the pressure roller, the outer peripheral surface of the cleaning member 51 can still contact the outer peripheral surface of the pressure roller, so that the cleaning member 51 can maintain the elastic resistance and friction contact with the pressure roller, so as to better achieve the cleaning effect on the pressure roller.

[0213] By adopting the above technical solution, the cleaning member 51 can rotate relative to the pressure roller, and the rotation axis of the cleaning member 51 is parallel to the rotation axis of the pressure roller, so that the cleaning member 51 can elastically support and frictionally contact various positions of the outer peripheral surface of the pressure roller in turn, thereby achieving the cleaning effect of the residue on the pressure roller.

[0214] In other embodiments, the cleaning member 51 may be fixed relative to the dust box 52. Based on this, when the pressure roller rotates, the pressure roller moves relative to the dust box 52, which in turn causes the pressure roller to move relative to the cleaning member 51, so that the cleaning member 51 can achieve a cleaning effect on the pressure roller through the relative movement between the pressure roller and the cleaning member 51.

[0215] In some embodiments, as shown in Figures 2, 5, and 18, the cleaning member 51 includes a rotating body 511 and an elastic member 512, and the elastic member 512 is provided on the outer peripheral surface of the rotating body 511. During use, the cleaning member 51 is elastically supported and frictionally contacted with the outer peripheral surface of the pressure roller by the elastic member 512, so that when the cleaning member 51 rotates relative to the pressure roller, the elastic member 512 cleans the residue on the pressure roller. The rotating body 511 can rotate to drive the elastic member 512 to rotate together. Based on this, the cleaning member 51 is able to elastically support, frictionally contact the pressure roller, and rotate.

[0216] In some implementations, the elastic member 512 can be a strip of plastic, such as the bristles on a brush, which has a certain degree of elasticity and toughness. In other implementations, the elastic member 512 can also be the bristles on a feather duster. In still other implementations, the elastic member 512 can also be a strip structure made of bamboo. In the above, the elastic member 512 is provided in multiple forms. In still other implementations, the elastic member 512 can also be a line wrapped around the outer periphery of the rotating body 511, such as a plastic line, in which case the line can be one or more. Among them, the elastic member 512 can be in various forms, which are not listed here one by one.

[0217] In some embodiments, please refer to FIG2 , FIG5 and FIG18 , the cleaning assembly 50 further includes a scraper 53 , which is disposed in the receiving groove 521 . The scraper 53 is used to scrape off residues on the cleaning member 51 when the cleaning member 51 rotates.

[0218] The scraper 53 may be in a strip shape, a sheet shape, or the like.

[0219] As shown in FIG18 , the scraper 53 is disposed within the receiving groove 521 and is fixed relative to the dust collection box 52. At least a portion of the scraper 53 extends into the cleaning member 51. For example, the scraper 53 extends between the plurality of elastic members 512. The at least partial extension of the scraper 53 into the cleaning member 51 may be achieved by partially or completely extending the cleaning member 51.

[0220] When the cleaning member 51 rotates to clean the residue, residue may remain on the cleaning member 51, for example, residue may remain between the elastic member 512. When the pressure roller presses the pressed member C, if residue also remains on the cleaning member 51 while cleaning the residue on the pressure roller, the residue on the cleaning member 51 may fall back onto the pressure roller, thereby damaging the pressed member C.

[0221] During the rotation of the cleaning member 51, the cleaning member 51 rotates relative to the dust collection box 52, while the scraping member 53 is fixed relative to the dust collection box 52, causing the cleaning member 51 to move relative to the scraping member 53. As a result, the elastic member 512 on the cleaning member 51 can also elastically deform under the action of the scraping member 53, causing residue between the elastic member 512 and the elastic member 512 to fall out. In other words, during the rotation of the cleaning member 51, the cleaning member 51 moves relative to the scraping member 53, and the scraping member 53 scrapes the elastic portion of the cleaning member 51, thereby scraping residue remaining on the cleaning member 51 and away from the cleaning member 51. At this time, due to the exhaust device operating, the residue scraped off by the scraping member 53 can be drawn into the dust collection bin 522 or the exhaust device, thereby achieving a cleaning effect on the cleaning member 51.

[0222] By adopting the above-mentioned technical solution, during the rotation of the cleaning member 51, the cleaning member 51 moves relative to the scraping member 53, so that the scraping member 53 can scrape off the residue remaining on the cleaning member 51, thereby improving the problem of the residue remaining on the cleaning member 51 damaging the extruded member C during the process of the pressure roller pressing the extruded member C.

[0223] In some embodiments, referring to Figures 2 to 5 , the extrusion device 100 further includes a dust collecting assembly 60. The dust collecting assembly 60 includes a first dust collecting roller 61, which is rotatably arranged. The rotation axis of the first dust collecting roller 61 is parallel to the rotation axis of the pressure roller. The outer circumference of the first dust collecting roller 61 contacts the outer circumference of the pressure roller and is capable of collecting and removing residue from the pressure roller during rotation.

[0224] The first sticky roller 61 is in a roller shape and can rotate around its rotation axis.

[0225] The outer surface of the first sticky roller 61 is sticky. For example, a sticky coating can be provided on the outer surface of the first sticky roller 61, or a sticky structure can be provided on the outer surface of the first sticky roller 61. All of the above can make the outer surface of the first sticky roller 61 sticky.

[0226] When the pressure roller rotates, the outer surface of the first sticky roller 61 contacts the outer surface of the pressure roller, and the outer surface of the first sticky roller 61 is sticky. This allows the pressure roller to drive the first sticky roller 61 to rotate, with the rotation direction of the first sticky roller 61 being opposite to that of the pressure roller. Furthermore, the first sticky roller 61 can also be rotated by an external force, with the rotation direction of the first sticky roller 61 being opposite to that of the pressure roller. In this case, since the pressure roller and the first sticky roller 61 rotate in opposite directions, the outer surface of the first sticky roller 61 can effectively contact the outer surface of the pressure roller at various locations, thereby achieving a bonding effect at various locations on the outer surface of the pressure roller, thereby removing residue from the pressure roller.

[0227] By adopting the above technical solution, the first dust-sticking roller 61 can rotate in the opposite direction to the pressure roller, thereby removing the residue on the pressure roller, thereby improving the problem of damage to the extruded part C caused by the residue on the pressure roller.

[0228] In some embodiments, please refer to Figures 2 to 5 together. The dust-sticking component 60 also includes a second dust-sticking roller 62. The rotation axis of the second dust-sticking roller 62 is parallel to the rotation axis of the first dust-sticking roller 61. The outer peripheral surface of the second dust-sticking roller 62 contacts the outer peripheral surface of the first dust-sticking roller 61 and can remove the residue of the first dust-sticking roller 61 during rotation.

[0229] The second sticky roller 62 is in a roller shape and is rotatable around its rotation axis.

[0230] The outer surface of the second sticky roller 62 is sticky. For example, a sticky coating can be provided on the outer surface of the second sticky roller 62, or a sticky structure can be provided on the outer surface of the second sticky roller 62. All of the above can make the outer surface of the first sticky roller 61 sticky.

[0231] When the pressure roller rotates, the outer surface of the second sticky roller 62 contacts the outer surface of the first sticky roller 61, and the outer surface of the second sticky roller 62 is sticky. This allows the first sticky roller 61 to drive the second sticky roller 62 to rotate, with the second sticky roller 62 rotating in the opposite direction of the pressure roller. Furthermore, the second sticky roller 62 can also be driven by an external force to rotate in the opposite direction of the first sticky roller 61. In this case, since the first and second sticky rollers 61 and 62 rotate in opposite directions, the outer surface of the second sticky roller 62 can effectively contact the outer surface of the first sticky roller 61 at various locations, thereby achieving adhesion to various locations on the outer surface of the first sticky roller 61 and removing any residue from the first sticky roller 61.

[0232] By adopting the above technical solution, the second sticky roller 62 can remove the residue on the outer peripheral surface of the first sticky roller 61, which is beneficial for the first sticky roller 61 to continuously achieve the effect of removing the residue on the outer peripheral surface of the pressure roller.

[0233] In some embodiments, please refer to FIG. 2 , FIG. 4 and FIG. 5 , the dust-binding assembly 60 and the cleaning assembly 50 are sequentially distributed along the rotation path of the pressure roller.

[0234] As shown in the figure, the dust collecting assembly 60 and the cleaning assembly 50 are both located on the outer periphery of the pressure roller. The dust collecting assembly 60 and the cleaning assembly 50 are sequentially arranged along the rotational path of the rotating pressure roller. Thus, as the pressure roller presses the extruded part C, each position of the pressure roller first passes through the dust collecting assembly 60 to remove residue from the pressure roller surface. The dust collecting assembly 60 then passes through the cleaning assembly 50 to clean residue from the pressure roller's air escape groove 40 and the pressure roller surface, which is then removed by the exhaust device.

[0235] By adopting the above technical solution, it is helpful to improve the cleaning force of the pressure roller, so as to improve the problem that the extruded part C is damaged by the residue on the pressure roller.

[0236] Please refer to Figures 2 to 5, Figure 19, and Figure 20 together. A second aspect of the embodiments of the present application provides a pole piece processing device 1000, which includes an extrusion device 100. The extrusion device 100 is used to extrude the pole piece A and the diaphragm B. The extrusion device 100 provided in this embodiment is the same as the extrusion device 100 involved in the above embodiments. The details can be referenced and will not be repeated here.

[0237] It can be understood that in this embodiment, the pole piece A and the diaphragm B can be equivalent to the extruded part C involved in the above embodiments. The pole piece processing equipment 1000 is mainly used to process the pole piece A and the diaphragm B.

[0238] In some embodiments, as shown in FIG19 , after the electrode sheet A and diaphragm B are extruded to form a composite electrode sheet, they are then stacked to form an electrode assembly. For the electrode sheet A and diaphragm B to be extruded, diaphragm B is first stacked on both sides of the first electrode sheet A1. Then, second electrode sheet A2 is stacked on diaphragm B on both sides of the first electrode sheet A1, and the second electrode sheets A2 on both sides of the first electrode sheet A1 are staggered. For details, see FIG1 for the distribution of the first electrode sheet A1, second electrode sheet A2, and diaphragm B. Thus, after the extrusion device 100 extrudes the first electrode sheet A1, the second electrode sheet A2, and diaphragm B, the diaphragm B is exposed between any two adjacent second electrode sheets A2 on the same side of the first electrode sheet A1. Therefore, during the stacking process of forming the composite electrode sheet formed by the electrode sheet A and diaphragm B into an electrode assembly, the exposed portions of the diaphragm B can be stacked and bonded to the adjacent second electrode sheets A2, resulting in an electrode assembly with excellent bonding reliability.

[0239] In other embodiments, as shown in FIG20 , after the electrode sheet A and the diaphragm B are extruded to form a composite electrode sheet, they are then shaped by winding to form an electrode assembly. The electrode sheets A and diaphragms B to be extruded can be stacked according to the distribution direction of the first electrode sheet A1, diaphragm B, second electrode sheet A2, and diaphragm B. There is no limit on the number of first electrode sheets A1, second electrode sheets A2, and diaphragms B. As long as at least one of the two sides of the stacked structure in the thickness direction is a diaphragm B, the diaphragm B on that side is referred to as the outermost diaphragm B. With this arrangement, when the extrusion device 100 squeezes the electrode sheet A and diaphragm B, the diaphragm B is partially free of air, and thus, the outermost diaphragm B is also partially free of air. In this way, during the process of winding the composite electrode sheet formed by the electrode sheet A and diaphragm B to form an electrode assembly, the outermost diaphragm B can also adhere to the electrode sheet A through its adhesive force, thereby providing the electrode assembly with better adhesive reliability.

[0240] It is understandable that when the extrusion device 100 is used to extrude the pole piece A and the diaphragm B, the distribution of the pole piece A and the diaphragm B may be other ways, and is not limited to the two distribution ways mentioned above.

[0241] By adopting the above-mentioned technical solution, when the extrusion device 100 extrude the electrode A and the diaphragm B to form a composite electrode, the air avoidance groove 40 of the extrusion device 100 can realize local air avoidance of the diaphragm B, which can reduce the damage of the extrusion device 100 to the diaphragm B, so that after the extrusion operation, the adhesion force of the air avoided part of the diaphragm B can be retained, and then it can play a sticky role in the subsequent shaping operation, thereby improving the problem of poor adhesion of the electrode assembly, which helps to improve the quality of the electrode assembly.

[0242] In some embodiments, please refer to Figures 2, 19 and 20. The electrode processing equipment 1000 also includes a heating device 200, which is used to heat the electrode A and the diaphragm B, and the extrusion device 100 is used to extrude the heated electrode A and the diaphragm B.

[0243] The heating device 200 is a device that can dissipate heat to perform heating. For example, the heating device 200 can be an electric heating wire or a device that generates an open flame to perform heating.

[0244] The heating device 200 and the extrusion device 100 are sequentially distributed along the conveying direction of the electrode A and the diaphragm B, wherein the conveying direction of the diaphragm B is the direction X shown in Figures 19 and 20.

[0245] As shown in FIG19 , in this embodiment, after forming a composite electrode sheet, the diaphragm B and the electrode sheet A are primarily shaped by stacking to form an electrode assembly. After the diaphragm B is stacked on both sides of the first electrode sheet A1, the first electrode sheet A1 and the diaphragm B are transported along a direction X. In the direction of transport of the first electrode sheet A1 and the diaphragm B, the first electrode sheet A1 and the diaphragm B first pass through a heating device 200 , which dissipates heat, thereby subjecting the first electrode sheet A1 and the diaphragm B to high temperature conditions. Subsequently, the second electrode sheet A2 is stacked on the diaphragm B on both sides of the first electrode sheet A1, with the second electrode sheets A2 on both sides of the first electrode sheet A1 staggered. The entire assembly of the first electrode sheet A1, the second electrode sheet A2, and the diaphragm B passes through the extrusion gap 30 of the extrusion device 100. Under high temperature conditions, the diaphragm B bonds with the first electrode sheet A1 and the second electrode sheet A2, thereby forming a composite electrode sheet for stacking.

[0246] As shown in Figure 20, after the diaphragm B and the electrode piece A form a composite electrode piece, they are mainly shaped into an electrode assembly by winding. The electrode piece A and diaphragm B to be wound are stacked and transported along the direction X, and then sequentially pass through the heating device 200 and the extrusion device 100. When the electrode piece A and the diaphragm B pass through the heating device 200, the diaphragm B is exposed to high temperature conditions. When the electrode piece A and the diaphragm B enter the extrusion device 100, the diaphragm B and the electrode piece A are extruded by the extrusion device 100 and bonded under high temperature conditions to form a composite electrode piece for shaping by winding.

[0247] By adopting the above technical solution, the electrode A and the diaphragm B are first heated by the heating device 200 and then locally extruded by the extrusion device 100, so as to form a composite electrode, so that the composite electrode has better bonding reliability.

[0248] Please refer to Figures 2 and 19 to 21. A third aspect of the embodiments of the present application provides a battery processing device, which includes a pole piece processing device 1000 and a shaping device 2000. The pole piece processing device 1000 is used to extrude the pole piece A and the diaphragm B to form a composite pole piece. The shaping device 2000 is used to shape the composite pole piece into an electrode assembly. The pole piece processing device 1000 involved in this embodiment is the same as the pole piece processing device 1000 involved in the above embodiments. Please refer to the details for details and will not be repeated here.

[0249] The shaping device 2000 refers to a device used to shape a composite electrode sheet to form an electrode assembly.

[0250] Specifically, when the pole piece processing equipment 1000 extrude the pole piece A and the diaphragm B to form a composite pole piece for shaping by stacking, the shaping equipment 2000 is a device for stacking the pole piece A and the diaphragm B. When the pole piece processing equipment 1000 extrude the pole piece A and the diaphragm B to form a composite pole piece for shaping by winding, the shaping equipment 2000 is a device for winding the composite pole piece.

[0251] The electrode assembly refers to the component in the battery used to generate the electrochemical reaction, which is mainly formed by the electrode A and the diaphragm B. The electrode A involved in the above and following embodiments can be the first electrode A1 or the second electrode A2. The first electrode A1 and the second electrode A2 can be the positive electrode A and the negative electrode A, respectively, or the negative electrode A and the positive electrode A, respectively.

[0252] In addition, the battery processing equipment may further include an assembly device for assembling the electrode assembly shaped by the shaping device 2000 into a housing, thereby forming a battery.

[0253] By adopting the above-mentioned technical solution, when the extrusion device 100 extrude the electrode A and the diaphragm B to form a composite electrode, the air avoidance groove 40 of the extrusion device 100 can realize local air avoidance of the diaphragm B, which can reduce the damage of the extrusion device 100 to the diaphragm B, so that after the extrusion operation, the adhesion force of the air avoided part of the diaphragm B can be retained, and then it can play a sticky role in the shaping operation, thereby improving the problem of poor adhesion of the electrode assembly, which helps to improve the quality of the electrode assembly.

[0254] The above are merely optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. An extrusion device (100), wherein: include: A first extrusion (10) having a first surface (101); The second extrusion piece (20) has a second surface (201), the first surface (101) and the second surface (201) are used to cooperate with each other to extrude the extruded piece (C), and the first surface and / or the second surface are provided with a clearance groove (40).

2. The extrusion device (100) according to claim 1, wherein The first surface (101) is a plane or a cylindrical surface, and the second surface (201) is a plane or a cylindrical surface.

3. The extrusion device (100) according to claim 1 or 2, wherein: The groove wall of the avoidance groove (40) transitions to the first surface (101) in an arc shape, and / or the groove wall of the avoidance groove (40) transitions to the second surface (201) in an arc shape (402).

4. The extrusion device (100) according to any one of claims 1 to 3, wherein: The first surface (101) is provided with a plurality of the space-avoiding grooves (40) distributed at intervals, and / or the second surface (201) is provided with a plurality of the space-avoiding grooves (40) distributed at intervals.

5. The extrusion device (100) according to claim 4, wherein The plurality of air-avoiding grooves (40) on the first surface (101) and / or the second surface (201) are evenly distributed.

6. The extrusion device (100) according to claim 4 or 5, wherein: The center points of the plurality of air-avoiding grooves (40) on the first surface (101) and / or the second surface (201) can be connected to form a grid structure (D), and the smallest grid unit (D1) of the grid structure (D) is an equilateral triangle.

7. The extrusion device (100) according to any one of claims 1 to 6, wherein: The air-avoiding groove (40) comprises a plurality of first grooves (401) and a plurality of second grooves (403), and two adjacent first grooves (401) are connected via the second groove (403).

8. The extrusion device (100) according to any one of claims 1 to 7, wherein: The outline of the air-avoiding groove (40) on the first surface (101) and / or the second surface (201) is circular, elliptical or square.

9. The extrusion device (100) according to any one of claims 1 to 8, wherein: The air avoidance groove (40) is configured such that the ratio of the area of ​​the portion of the extruded component (C) facing the air avoidance groove (40) to the area of ​​the extruded component (C) is in the range of 30% to 40%.

10. The extrusion device (100) according to any one of claims 1 to 9, wherein: The air-avoiding groove (40) is provided on the first surface (101), and the ratio of the first area to the second area of ​​the air-avoiding groove (40) on the first surface (101) is in the range of 30% to 40%; the second area is the sum of the first area and the area of ​​the first surface (101).

11. The extrusion device (100) according to any one of claims 1 to 10, wherein: The depth of the air-avoiding groove (40) is greater than 40 μm.

12. The extrusion device (100) according to any one of claims 1 to 11, wherein: The depth of the air-avoiding groove (40) is greater than 100 μm.

13. The extrusion device (100) according to any one of claims 1 to 12, wherein: The first extrusion member (10) and the second extrusion member (20) are both provided with the air avoidance groove (40), and the air avoidance groove (40) of the first extrusion member (10) and the air avoidance groove (40) of the second extrusion member (20) are staggered with respect to the extrusion positions on the extruded member (C) corresponding to the extrusion positions.

14. The extrusion device (100) according to any one of claims 1 to 13, wherein: The first extrusion member (10) and / or the second extrusion member (20) is a pressing roller rotatable around its rotation axis, and the outer peripheral surface of the pressing roller is provided with the air avoidance groove (40).

15. The extrusion device (100) according to claim 14, wherein The extrusion device (100) further comprises a cleaning assembly (50), and the cleaning assembly (50) is used for cleaning the pressing roller.

16. The extrusion device (100) according to claim 15, wherein The cleaning assembly (50) comprises: A dust collection box (52) is provided with a receiving groove (521), a dust collection bin (522), and a dust collection port (523) communicating with the receiving groove (521) and the dust collection bin (522); A cleaning member (51) is assembled in the receiving groove (521), with a portion of the cleaning member (51) exposed outside the receiving groove (521) and capable of elastically abutting and frictionally contacting the outer peripheral surface of the pressure roller when the pressure roller rotates; The dust collection box (52) is used to be connected to an external exhaust device so that the residue on the cleaning piece (51) can enter the dust collection bin (522) through the dust collection port (523) under the action of the exhaust device.

17. The extrusion device (100) according to claim 16, wherein The cleaning member (51) is rotatably arranged, and the rotation axis of the cleaning member (51) is parallel to the rotation axis of the pressure roller.

18. The extrusion device (100) according to claim 17, wherein The cleaning assembly (50) further comprises a scraping member (53) disposed in the receiving groove (521), wherein the scraping member (53) is used to scrape off residues on the cleaning member (51) when the cleaning member (51) rotates.

19. The extrusion device (100) according to any one of claims 14 to 18, wherein: The extrusion device (100) further includes a dust sticking assembly (60), wherein the dust sticking assembly (60) includes a first dust sticking roller (61) that is rotatably arranged, wherein the rotation axis of the first dust sticking roller (61) is parallel to the rotation axis of the pressure roller, and the outer peripheral surface of the first dust sticking roller (61) contacts the outer peripheral surface of the pressure roller and is capable of sticking to and removing residues from the pressure roller when rotating.

20. The extrusion device (100) according to claim 19, wherein The dust sticking assembly (60) further includes a second dust sticking roller (62) that is rotatably arranged, wherein the rotation axis of the second dust sticking roller (62) is parallel to the rotation axis of the first dust sticking roller (61), the outer peripheral surface of the second dust sticking roller (62) contacts the outer peripheral surface of the first dust sticking roller (61), and is capable of sticking to and removing residues of the first dust sticking roller (61) when rotating.

21. The extrusion device (100) according to claim 20, wherein The extrusion device (100) comprises a cleaning component (50), the cleaning component (50) is used to clean the pressure roller, and the dust-binding component (60) and the cleaning component (50) are distributed in sequence along the rotation path of the pressure roller.

22. A pole piece processing device (1000), wherein: It comprises an extrusion device (100) according to any one of claims 1 to 21, wherein the extrusion device (100) is used for extruding a pole piece (A) and a diaphragm (B).

23. The pole piece processing equipment (1000) according to claim 22, wherein: The electrode processing equipment (1000) further includes a heating device (200), wherein the heating device (200) is used to heat the electrode (A) and the diaphragm (B), and the extrusion device (100) is used to extrude the heated electrode (A) and the diaphragm (B).

24. A battery processing device, wherein: include: The electrode processing device (1000) according to claim 22 or 23, used for extruding the electrode (C) and the diaphragm (B) to form a composite electrode; A shaping device (2000) is used to shape the composite electrode into an electrode assembly.

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