Pole piece extension device and battery production system

Abstract

The utility model discloses a pole piece extension device and a battery production system. The pole piece extension device comprises a calendering mechanism and a drawing mechanism, the calendering mechanism is provided with an input side and an output side which are opposite to each other, the input side is used for receiving an input pole piece, the support component, the supporting roller and the compression roller assembly are both arranged on the support component, the compression roller assembly comprises a compression roller, and the supporting roller and the compression roller are configured to jointly calender partial blank areas of the pole piece. The drawing mechanism is located on the output side and comprises a drawing roller, the peripheral surface of the drawing roller is provided with a drawing area, the drawing area is configured to draw a blank area left after calendaring, at least one protrusion surrounding the axis of the drawing roller is formed on the peripheral surface of the drawing roller, a drawing area is formed on the peripheral surface of each protrusion, and the drawing area is arranged on the peripheral surface of the drawing roller. And each bulge corresponds to one compression roller.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to an electrode stretching device and a battery production system. Background Technology

[0002] Electrodes are the carriers for chemical reactions in a battery, and they are required for both charging and discharging. During electrode fabrication, an active material layer is typically coated onto the surface of a foil (current collector), followed by drying and stretching. Currently, a technical problem is that electrode strips are prone to breakage during the stretching process, which not only directly results in the loss of electrode raw materials but also affects subsequent production efficiency. Utility Model Content

[0003] In view of the above problems, this application provides an electrode stretching device and a battery production system, which rolls a portion of the blank area of ​​the electrode and then stretches the remaining portion, thereby reducing the likelihood of strip breakage during the electrode stretching process.

[0004] In a first aspect, this application provides an electrode stretching device, comprising:

[0005] A calendering mechanism has an input side and an output side facing away from each other. The input side is used to receive an input electrode sheet. The calendering mechanism includes a support member, a support roller, and a pressure roller assembly. The support roller and the pressure roller assembly are both disposed on the support member. The pressure roller assembly includes a pressure roller. The support roller and the pressure roller are configured to jointly calender a portion of the blank area of ​​the electrode sheet.

[0006] A drawing mechanism, located on the output side, includes a drawing roll with a drawing zone on its outer peripheral surface. The drawing zone is configured to draw the blank area remaining after calendering. At least one protrusion is formed on the outer peripheral surface of the drawing roll around the axis of the drawing roll. Each protrusion has a drawing zone on its outer peripheral surface, and each protrusion corresponds to a pressure roll.

[0007] By first pressing the electrode sheet with the support roller and the pressure roller assembly to extend part of the blank area of ​​the electrode sheet, and then extending the remaining blank area of ​​the electrode sheet through the drawing zone, the stress concentration phenomenon of the current collector of the electrode sheet during the subsequent high-tension stretching and rolling process can be alleviated, and the risk of strip breakage can be significantly reduced. In addition, the protrusions can extend the electrode sheet outward to achieve drawing, so that the electrode sheet can be fully extended and released after rolling, thereby reducing the occurrence of wrinkles in the blank area of ​​the electrode sheet.

[0008] In some embodiments, the number of pressure roller assemblies is at least one, each pressure roller assembly corresponds to a drawing zone, and along the axial direction of the pressure roller assembly, the size of the blank area for the roll pressing portion of each pressure roller is W1, and the size of each drawing zone is W2, wherein the ratio of W2 / W1 ranges from 1 / 4 to 2 / 3.

[0009] Therefore, the area of ​​the blank area of ​​the rolled electrode can be larger than that of the drawn electrode. On the one hand, it can release the stress of the electrode after coating more fully, reducing wrinkles and cracks caused by stress concentration after coating. On the other hand, it can also reduce the possibility of strip breakage caused by excessive extrusion stress.

[0010] In some embodiments, along the axial direction of the pressure roller assembly, the size of the blank area of ​​the electrode sheet is W3, and W1 is configured to be equal to (0.6~0.8)*W3.

[0011] Therefore, the occurrence of electrode breakage due to excessive extrusion stress during the calendering process can be reduced, and the coated electrode can release stress more fully.

[0012] In some embodiments, there are multiple drawing zones and multiple pressure roller assemblies. The multiple drawing zones are spaced apart along the axial direction of the pressure roller assemblies. The multiple pressure roller assemblies are spaced apart along the axial direction of the pressure roller assemblies. The electrode has multiple blanking zones spaced apart along the axial direction of the pressure roller assemblies. Different pressure roller assemblies are configured to co-calculate a portion of different blanking zones with the support rollers. Each drawing zone is configured to draw the remaining portion of each blanking zone after calendering.

[0013] Multiple pressure roller assemblies correspond one-to-one with multiple blank areas for calendering, which can reduce the uneven local extrusion stress caused by a single set of pressure rollers calendering all blank areas. This allows each blank area to obtain an appropriate extrusion and extension force, fully releasing the internal stress after coating in that area.

[0014] In some embodiments, the support member is rotatably connected to the support roller, and the pressure roller assembly is slidably connected to the support member along a first direction. The pressure roller assembly is configured to be driven to co-calculate a portion of the blank area with the support roller, and the first direction intersects the axial direction of the pressure roller assembly.

[0015] Therefore, the calendering operation can be started and stopped by driving the pressure roller assembly, which facilitates maintenance, electrode feeding, and replacement.

[0016] In some embodiments, the rolling mechanism further includes:

[0017] The hydraulic drive assembly includes a hydraulic actuator and a pneumatic-hydraulic booster mechanism. The booster port of the pneumatic-hydraulic booster mechanism is connected to the oil inlet of the hydraulic actuator. The hydraulic actuator is driven to drive the pressure roller assembly to move relative to the support roller in a first direction.

[0018] The booster port of the gas-liquid booster mechanism is connected to the oil inlet of the hydraulic actuator. By utilizing the principle of gas-liquid boosting, it can achieve high-pressure output while ensuring the accuracy of pressure regulation and output stability, preventing large pressure fluctuations. This allows for precise control of the calendering gap and calendering pressure between the pressure roller assembly and the support roller, ensuring that the blank area of ​​the electrode sheet is subjected to uniform force during calendering. This not only fully releases stress but also effectively addresses issues such as electrode sheet damage and strip breakage caused by excessive pressure or insufficient elongation caused by insufficient pressure, thus improving the consistency of the calendering effect.

[0019] In some embodiments, there are multiple pressure roller assemblies, which are spaced apart along the axial direction of the support roller. There are also multiple hydraulic actuators, which are spaced apart along the axial direction of the support roller. Each hydraulic actuator drives and connects to a pressure roller assembly. Each hydraulic actuator corresponds to a pneumatic-hydraulic booster mechanism and is connected to the booster port of each pneumatic-hydraulic booster mechanism.

[0020] By adjusting the boosting parameters of the corresponding gas-liquid boosting mechanism, the output pressure of each hydraulic actuator can be controlled individually, thereby precisely regulating the calendering gap and pressure between a single pressure roller assembly and the support roller. This helps to improve the consistency of pressure of each pressure roller assembly on different blank areas, thereby reducing the occurrence of pleats or strip breakage due to stress concentration caused by large pressure deviations.

[0021] In some embodiments, the calendering mechanism further includes a regulating valve, and the air inlet port of each gas-liquid booster mechanism is connected to the regulating valve. The air inlets of each regulating valve are interconnected, and the regulating valve is used to regulate the gas flow rate and / or velocity at the air inlet port.

[0022] Therefore, the air intake flow rate and velocity of each gas-liquid booster mechanism can be adjusted by regulating the valve, which helps to improve the consistency of pressure of each pressure roller assembly on different blank areas. Furthermore, during roller pressing, multiple pressure roller assemblies can operate synchronously to reduce stress concentration caused by large pressure deviations, which can lead to pleating or belt breakage.

[0023] In some embodiments, the rolling mechanism further includes:

[0024] The guide member and the pressure roller assembly are slidably connected to the support member along the first direction via the guide member;

[0025] The elastic element has one end abutting against the guide element and the other end abutting against the support element. The elastic force of the elastic element has a tendency to move the pressure roller assembly away from the support roller.

[0026] After the calendering operation is completed, the elastic element can drive the guide element to move by its own elastic force, thereby driving the pressure roller assembly away from the support roller along the first direction, realizing the automatic springback reset of the pressure roller assembly, so as to improve work efficiency.

[0027] In some embodiments, the rolling mechanism further includes:

[0028] The tension roller assembly is mounted on the support member and is located downstream of the pressure roller assembly and upstream of the drawing mechanism. The tension roller assembly is used to provide tension to the electrode sheet.

[0029] Speed ​​deviations may occur during calendering and drawing. By setting up tension roller assemblies, stable tension can be provided for the electrode sheets, thereby reducing the possibility of loosening, wrinkling, or breakage of the electrode sheets due to excessive tension.

[0030] In some embodiments, the tension roller assembly includes:

[0031] The swinging component is rotatably connected to the support component around the first axis;

[0032] The tension roller is connected to the oscillating component, and the axis of the tension roller is parallel to the first axis.

[0033] The force-applying component is connected to the swinging component and is used to drive the swinging component to rotate relative to the support component.

[0034] The oscillating component is rotatably connected to the support component around the first axis. The tension roller is connected to the oscillating component, and their axes are parallel. In conjunction with the force-applying component, a rotational force is applied to the oscillating component, allowing the tension roller to adaptively adjust its position according to the tension fluctuations of the electrode. When the electrode experiences momentary slack, the force of the force-applying component drives the oscillating component to rotate, pushing the tension roller closer to the electrode to promptly compensate for the tension gap and tighten the electrode. When the electrode tension increases momentarily, the tension of the electrode can overcome part of the force of the force-applying component, causing the oscillating component to rotate in the opposite direction, buffering the tension impact, thereby maintaining stable electrode tension and reducing electrode tearing caused by sudden tension increases or slack and wrinkling caused by insufficient tension.

[0035] Secondly, this application provides a battery production system, including the electrode stretching device of the first aspect.

[0036] Since the battery production system includes all the technical features of the electrode stretching device described in the first aspect above, its effect is the same as described above, and will not be repeated here.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0039] Figure 1 This is a schematic diagram of the electrode structure;

[0040] Figure 2 This is a schematic diagram of the structure of an electrode stretching device for stretching an electrode according to some embodiments of this application;

[0041] Figure 3 for Figure 2 A magnified view of a portion of point I;

[0042] Figure 4 This is an isometric view of the calendering mechanism of an electrode stretching apparatus according to some embodiments of this application;

[0043] Figure 5 This is a schematic diagram of the calendering mechanism of an electrode stretching apparatus according to some embodiments of this application;

[0044] Figure 6 for Figure 5 A magnified view of section II;

[0045] Figure 7 This is a partial structural diagram of the drawing roller in an electrode stretching apparatus according to some embodiments of this application;

[0046] Figure 8 for Figure 7 AA section view;

[0047] Figure 9 This is a structural diagram showing the connection between the gas-liquid booster mechanism and the regulating valve in an electrode stretching device according to some embodiments of this application.

[0048] The reference numerals in the detailed embodiments are as follows:

[0049] 100. Electrode stretching device;

[0050] 10. Calendering mechanism; 11. Support roller; 12. Pressure roller assembly; 121. Pressure roller; 122. Roller seat; 13. Support component; 14. Hydraulic drive assembly; 141. Hydraulic actuator; 142. Gas-liquid booster mechanism; 143. Regulating valve; 15. Guide component; 16. Elastic component; 17. Tension roller assembly; 171. Tension roller; 172. Swinging component; 1721. First swing arm; 1722. Second swing arm; 1723. Rotating shaft; 173. Force application component;

[0051] 20. Drawing mechanism; 21. Drawing roll; 211. Protrusion; 2111. Drawing zone;

[0052] 30. Coating roller;

[0053] 40. Guide rollers;

[0054] 200, Electrode; 210, Blank Area;

[0055] X, the first direction. Detailed Implementation

[0056] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0058] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0059] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0061] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0062] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0063] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0064] Electrode coating involves applying an active material layer to the surface of a foil. The areas on the electrode surface not coated with this active material layer are typically called blank areas. After coating, the coated areas usually need to be stretched, and then the blank areas are stretched as well to release stress. Currently, a technical problem is that strip breakage can easily occur during the stretching process in the blank areas.

[0065] In view of this, this application provides an electrode stretching device, which stretches part of the blank area of ​​the electrode by first pressing the electrode support roller and the pressure roller assembly together, and then stretches the remaining blank area of ​​the electrode by the stretching zone. Compared with the method of stretching the blank area at once, the segmented stretching method can reduce the tension of each stretching and reduce the possibility of strip breakage.

[0066] For ease of explanation, the following embodiments use an electrode stretching device 100 from some embodiments of this application as an example.

[0067] Please refer to Figure 1 and Figure 2The electrode stretching apparatus 100 includes a calendering mechanism 10 and a drawing mechanism 20. The calendering mechanism 10 has an input side and an output side facing away from each other. The input side is used to receive the input electrode 200. The calendering mechanism 10 includes a support member 13, a support roller 11, and a pressure roller assembly 12. The support roller 11 and the pressure roller assembly 12 are both disposed on the support member 13. The pressure roller assembly 12 includes a pressure roller 121. The support roller 11 and the pressure roller 121 are configured to jointly calender a portion of the blank area 210 of the electrode 200. The drawing mechanism 20 is located on the output side. The drawing mechanism 20 includes a drawing roller 21. The outer peripheral surface of the drawing roller 21 has a drawing area 2111. The drawing area 2111 is configured to draw the remaining blank area 210 after calendering.

[0068] The blank area 210 refers to the blank area on the surface of electrode 200 where no active material (such as positive electrode active material / negative electrode active material) is coated.

[0069] Calendering refers to the process in which the support roller 11 and the pressure roller assembly 12 of the calendering mechanism 10 exert pressure on a portion of the blank area 210 of the electrode sheet 200, causing the blank area 210 to undergo plastic deformation and achieve extension.

[0070] Drawing refers to the process in which the drawing zone 2111 of the drawing mechanism 20 (drawing roll 21) applies a tensile force to the blank area 210 remaining after rolling, causing the blank area 210 to undergo further plastic deformation and thus achieve extension. Specifically, when the drawing roll 21 is working, the drawing zone 2111 on its outer peripheral surface is in close contact with the blank area 210 of the rolled electrode 200. Utilizing the friction between the drawing zone 2111 and the surface of the electrode 200, and in conjunction with the uniform rotation of the drawing roll 21, a traction force (tensile force) is generated on the electrode 200 along its transport direction, causing the remaining blank area 210 of the electrode 200 to extend.

[0071] The drawing zone 2111 refers to the portion that can provide tensile force to the blank area 210 of the electrode 200.

[0072] The drawing roll 21 includes a drawing cylinder and a drawing roll shaft, which are coaxially arranged. As an example, the drawing roll shaft and the drawing cylinder can be an integral structure, i.e., they are fixedly connected or integrally formed. The drawing mechanism 20 includes a frame, and the drawing roll shaft is rotatably connected to the frame. The drawing roll shaft can rotate via a drive component, such as a motor. As another example, the drawing roll shaft can be fixed to the frame, and the drawing roll shaft and the drawing roll 21 are rotatably connected. The electrode sheet 200 can be driven by the traction force of an external traction component. For example, a winding mechanism can be provided downstream of the drawing mechanism 20, and the winding roll can be driven by a motor to rotate, pulling the electrode sheet 200 to move. The electrode sheet 200 then drives the drawing roll 21 to rotate relative to the drawing roll shaft through friction. The drawing mechanism 20 and the support roll 11 can be located on the same frame or on different frames.

[0073] By first pressing the electrode 200 with the support roller 11 and the pressure roller assembly 12, the blank area 210 of the electrode 200 is extended, and then the remaining blank area 210 of the electrode 200 is drawn through the drawing zone 2111. This method can alleviate the stress concentration phenomenon of the current collector of the electrode 200 in the subsequent high-tension stretching and rolling process, and significantly reduce the risk of strip breakage.

[0074] In some embodiments, the support roller 11 includes a support roller shaft and a support roller cylinder. The axes of the support roller shaft and the support roller cylinder are parallel to each other and can be fixed by means of integral molding or fixed connection. The support roller shaft is rotatably connected to the support member 13. The support roller cylinder can also be rotatably connected to the support roller shaft, and the support roller shaft is fixed to the support member 13. The support roller shaft can be driven by a motor to achieve rotation. The support roller 11 may also include only the support roller shaft, which is rotatably connected to the support member 13. The support roller shaft and the pressure roller 121 are located in the blank area 210 of the calendered electrode sheet 200.

[0075] In some embodiments, please refer to Figure 6 and Figure 7 The number of pressure roller assemblies 12 is at least one, and each pressure roller assembly 12 corresponds to a drawing zone 2111. Along the axial direction of the pressure roller assembly 12, the size of the blank area 210 of each pressure roller 121 used for rolling is W1, and the size of each drawing zone 2111 is W2, wherein the ratio of W2 / W1 is in the range of 1 / 4 to 2 / 3.

[0076] As an example, the pressure roller assembly 12 may also include a roller seat 122, with the pressure roller 121 rotatably connected to the roller seat 122. The roller seat 122 can be driven by a drive component to enable the pressure roller 121 and the support roller 11 to jointly squeeze the blank area 210 of the electrode sheet 200 and perform a separation operation.

[0077] Therefore, the area of ​​the blank area 210 of the rolled electrode 200 can be larger than that of the blank area 210 of the drawn electrode 200. On the one hand, it can release the stress of the electrode 200 after coating more fully, reduce the wrinkles and cracks caused by stress concentration after coating, and also reduce the breakage caused by excessive extrusion stress.

[0078] In some embodiments, the minimum gap between the pressure roller 121 and the support roller 11 is 0.01mm-0.1mm, and the thickness of the blank area 210 of the electrode 200 is 15μm-50μm.

[0079] In some embodiments, please refer to Figure 1 and Figure 6Along the axial direction of the pressure roller assembly 12, the size of the blank area 210 of the electrode 200 is W3, and W1 is configured to be equal to (0.6~0.8)*W3.

[0080] When there are multiple blank areas 210 of electrode 200, W3 refers to the size of one blank area 210.

[0081] Therefore, the possibility of electrode 200 breaking due to excessive extrusion stress during the calendering process can be reduced, and the coated electrode 200 can release stress more fully.

[0082] In some embodiments, please refer to Figure 1 , Figure 4 and Figure 5 The number of drawing zones 2111 and the number of pressure roller assemblies 12 are both multiple. Multiple drawing zones 2111 are spaced apart along the axial direction of the pressure roller assembly 12. Multiple pressure roller assemblies 12 are spaced apart along the axial direction of the pressure roller assembly 12. The electrode sheet 200 has multiple blank areas 210 spaced apart along the axial direction of the pressure roller assembly 12. Different pressure roller assemblies 12 are configured to co-calculate a portion of different blank areas 210 with the support roller 11. Each drawing zone 2111 is configured to draw the remaining portion of each blank area 210 after calendering.

[0083] Multiple pressure roller assemblies 12 correspond one-to-one with multiple blank areas 210 for calendering, which can reduce the uneven local extrusion stress caused by the concentrated calendering of all blank areas 210 by a single pressure roller 121, so that a part of each blank area 210 can obtain an extrusion and extension force that is suitable for itself, and fully release the internal stress after coating in that area.

[0084] In some embodiments, please refer to Figure 1 , Figure 7 and Figure 8 The outer peripheral surface of the drawing roll 21 has at least one protrusion 211 surrounding the axis of the drawing roll 21, and the outer peripheral surface of each protrusion 211 has a drawing area 2111, and each protrusion 211 corresponds to a pressure roll 121.

[0085] Along the radial direction of the drawing roll 21, the protrusion 211 has a size of S, which is greater than the maximum thickness of the coating layer on one side of the electrode 200, so as to provide tensile force for the blank area 210 of the electrode 200. The material of the protrusion 211 can be a wear-resistant material, such as Teflon, or polytetrafluoroethylene, etc.

[0086] Please refer to Figure 1 , Figure 6 and Figure 7, along the axial direction of the pressing roller assembly 12, the size of the protrusion 211 is W4, and W4 can be less than or equal to W3. When W4 = W3, W2 is less than W3. For example, W2 is (0.6 - 0.8) times of W3. When W4 < W3, W2 can be less than or equal to W4.

[0087] The protrusion 211 can be fixed to the outer peripheral surface of the drawing roller 21 by means of bonding, injection molding, spraying, etc., or can be integrally formed with the drawing roller 21.

[0088] The protrusion 211 can make the pole piece 200 extend outward to achieve drawing, so that the pole piece 200 can fully extend and release stress after drawing, thereby reducing the occurrence of wrinkles in the blank area 210 of the pole piece 200.

[0089] In some embodiments, please refer to Figures 1-3 , the support member 13 is rotatably connected to the support roller 11, the pressing roller assembly 12 is slidably connected to the support member 13 along the first direction X, and the pressing roller assembly 12 is arranged to be driven for jointly pressing a part of the blank area 210 with the support roller 11, and the first direction X intersects with the axial direction of the pressing roller assembly 12.

[0090] As an example, the pressing roller assembly 12 includes a roller seat 122 and a pressing roller 121. The roller seat 122 is rotatably connected to the pressing roller 121, and the roller seat 122 is slidably connected to the support member 13 along the first direction X. Specifically, the roller seat 122 can be slidably connected to the support member 13 through a guide rail slider, or can be slidably connected to the support through the sliding fit of a guide protrusion in a guide groove. For example, the roller seat 122 is provided with a guide groove and the support member 13 is provided with a guide protrusion, or the roller seat 122 is provided with a guide protrusion and the support member 13 is provided with a guide groove. The roller seat 122 can also be slidably connected to the support member 13 along the first direction X through a guide rod. Specifically, the support member 13 is provided with a through hole extending along the first direction X, the guide rod is slidably connected to the through hole, one end of the guide rod is fixedly connected to the roller seat 122, such as by welding or threaded connection, etc., and a limiting protrusion is provided at the other end of the guide rod to prevent the guide rod from disengaging from the through hole.

[0091] The pressing roller assembly 12 can be driven by a driving mechanism such as an electric push rod, a hydraulic rod or a cylinder.

[0092] Thus, by driving the pressing roller assembly 12, the start and stop of the pressing action can be realized, which is convenient for maintenance and operations such as the feeding and replacement of the pole piece 200.

[0093] In some embodiments, please refer to Figure 2The calendering mechanism 10 also includes a hydraulic drive assembly 14, which includes a hydraulic actuator 141 and a gas-liquid booster mechanism 142. The booster oil port of the gas-liquid booster mechanism 142 is connected to the oil inlet of the hydraulic actuator 141. The hydraulic actuator 141 is driven to connect with the pressure roller assembly 12. The hydraulic actuator 141 is used to drive the pressure roller assembly 12 to move relative to the support roller 11 along the first direction X.

[0094] The gas-liquid booster mechanism 142 may include a gas-liquid booster, a gas-liquid booster cylinder, or a gas-liquid booster pump, etc.

[0095] The hydraulic actuator 141 can be a hydraulic cylinder.

[0096] The booster port of the gas-liquid booster mechanism 142 can be directly connected to the oil inlet of the hydraulic actuator 141, or it can be connected through hydraulic components (such as connectors) or hydraulic pipelines.

[0097] The hydraulic actuator 141 and the pressure roller assembly 12 can be connected by bolts, snap-fit, riveting or welding.

[0098] The booster oil port of the gas-liquid booster mechanism 142 is connected to the oil inlet of the hydraulic actuator 141. By utilizing the principle of gas-liquid booster, high pressure output can be achieved while ensuring the accuracy of pressure regulation and output stability, preventing large pressure fluctuations. This allows for precise control of the calendering gap and calendering pressure between the pressure roller assembly 12 and the support roller 11, ensuring that the blank area 210 of the electrode 200 is subjected to uniform force during calendering. This not only fully releases stress but also effectively prevents problems such as electrode 200 damage and strip breakage caused by excessive pressure or insufficient elongation caused by insufficient pressure, thus improving the consistency of calendering results.

[0099] In some embodiments, please refer to Figure 2 There are multiple pressure roller assemblies 12, which are spaced apart along the axial direction of the support roller 11. There are also multiple hydraulic actuators 141, which are spaced apart along the axial direction of the support roller 11. Each hydraulic actuator 141 drives and connects to a pressure roller assembly 12. Each hydraulic actuator 141 corresponds to a gas-liquid booster mechanism 142 and is connected to the booster oil port of each gas-liquid booster mechanism 142.

[0100] By adjusting the boosting parameters of the corresponding gas-liquid boosting mechanism 142, the output pressure of each hydraulic actuator 141 can be controlled individually, thereby precisely controlling the calendering gap and pressure between a single pressure roller assembly 12 and the support roller 11. This helps to improve the consistency of pressure of each pressure roller assembly 12 on different blank areas 210, so as to reduce the situation of pleating or strip breakage caused by stress concentration due to large pressure deviation.

[0101] In some embodiments, please refer to Figure 2 and Figure 9 The calendering mechanism 10 also includes a regulating valve 143. The air inlet port of each gas-liquid booster mechanism 142 is connected to the regulating valve 143. The air inlets of each regulating valve 143 are interconnected. The regulating valve 143 is used to regulate the gas flow rate and / or velocity at the air inlet port.

[0102] The air inlet port of each gas-liquid booster mechanism 142 can be connected to the regulating valve 143 via hydraulic components (such as connectors) and / or hydraulic lines, or it can be directly connected to the regulating valve 143.

[0103] The regulating valve 143 can be, but is not limited to, a pressure regulating valve, a throttle valve, or a proportional pressure regulating valve.

[0104] The air inlets of each regulating valve 143 are interconnected and connected to the main air intake pipeline, which supplies gas with a certain pressure (not shown in the figure) from the air source.

[0105] Therefore, the air intake flow rate and velocity of each gas-liquid booster mechanism 142 can be adjusted by regulating valve 143, which helps to improve the consistency of pressure of each pressure roller assembly 12 on different blank areas 210. Moreover, multiple pressure roller assemblies 12 can operate synchronously during rolling to reduce the situation of pleating or belt breakage caused by stress concentration due to large pressure deviation.

[0106] In some embodiments, please refer to Figure 2 and Figure 3 The calendering mechanism 10 also includes a guide 15 and an elastic member 16. The pressure roller assembly 12 is slidably connected to the support member 13 along the first direction X via the guide 15. One end of the elastic member 16 abuts against the guide 15, and the other end of the elastic member 16 abuts against the support member 13. The elastic force of the elastic member 16 has a tendency to move the pressure roller assembly 12 away from the support roller 11.

[0107] The elastic element 16 can be a compression spring sleeved on the guide element 15, or it can be multiple elastic plates sleeved on the guide element 15. The guide element 15 can be a guide rod. In other examples, the guide element 15 can be a guide rail, and the end of the guide rail away from the pressure roller assembly 12 can be connected to a limiting element to achieve the function of limiting and connecting to one end of the elastic element 16, while the other end of the elastic element 16 is connected to the support member 13.

[0108] After the calendering operation is completed, the elastic element 16 can push the guide element 15 to move by its own elastic force, thereby driving the pressure roller assembly 12 away from the support roller 11 along the first direction X, so as to realize the automatic springback reset of the pressure roller assembly 12 and improve work efficiency.

[0109] In some embodiments, please refer to Figure 2 and Figure 4The calendering mechanism 10 also includes a tension roller assembly 17. The tension roller assembly 17 is disposed on the support member 13, and is located downstream of the pressure roller assembly 12 and upstream of the calendering mechanism 20. The tension roller assembly 17 is used to provide tension to the electrode sheet 200.

[0110] Upstream refers to the feed side, and downstream refers to the discharge side.

[0111] The tension roller assembly 17 can be rotatably connected to the support member 13 to allow the tension roller 171 in the tension roller assembly 17 to swing relative to the support member 13. Alternatively, it can be slidably connected to the support member 13 along a direction perpendicular to the axis of the tension roller assembly 17. The tension roller assembly 17 can be provided with a preset tension via a spring or similar means, or by being driven by a cylinder. As an example, the tension roller assembly 17 is slidably connected to the support member 13 along a direction perpendicular to its own axis. One end of the tension roller assembly 17 is connected to a compression spring, and the support member 13 is connected to the other end of the compression spring. The tension roller 171 of the tension roller assembly 17 tensions the electrode 200 through the elastic force of the compression spring. The compression spring can be replaced by a cylinder, i.e., the tension roller assembly 17 is driven by a cylinder to provide tension to the tension roller assembly 17. That is, when conveying the electrode 200, the tension roller assembly 17 is compressed, causing the cylinder to contract by a certain amount, thus providing the preset tension.

[0112] Speed ​​deviations may occur during calendering and drawing. By setting the tension roller assembly 17, a stable tension can be provided for the electrode 200, thereby reducing the possibility of slack, wrinkles, or breakage due to excessive tension.

[0113] In some embodiments, please refer to Figure 2 and Figure 4 The tension roller assembly 17 includes a swing member 172, a tension roller 171, and a force-applying component 173. The swing member 172 is rotatably connected to the support member 13 about a first axis. The tension roller 171 is connected to the swing member 172, and the axis of the tension roller 171 is parallel to the first axis. The force-applying component 173 is connected to the swing member 172 and is used to drive the swing member 172 to rotate relative to the support member 13.

[0114] The swing component 172 can be a single piece or an integrated component formed by connecting multiple pieces. For example, the swing component 172 may include a first swing rod 1721, a second swing rod 1722, and a rotating shaft 1723. The rotating shaft 1723 is rotatably connected to the support component 13. One end of each of the first swing rod 1721 and the second swing rod 1722 is connected to the rotating shaft 1723. The other end of the first swing rod 1721 is connected to the force-applying component 173. The other end of the second swing rod 1722 is rotatably connected to the tension roller 171 or fixedly connected to the shaft of the tension roller 171. The tension roller 171 may include a tension roller shaft and a tension roller cylinder. The tension roller cylinder and the tension roller shaft can be fixedly connected together and arranged coaxially. The tension roller shaft is rotatably connected to the other end of the second swing rod 1722; alternatively, the tension roller shaft can be fixedly connected to the other end of the second swing rod 1722, and the tension roller cylinder can be rotatably connected to the tension roller shaft.

[0115] The force-applying component 173 can be either a cylinder or a spring.

[0116] Taking a cylinder as an example, the cylinder body is rotatably connected to the support member 13, and the actuating end of the cylinder is rotatably connected to the swing member 172 around the second axis. The first axis and the second axis are parallel to each other.

[0117] Taking a tension spring as an example, one end of the tension spring can be attached to the support member 13, and the other end of the tension spring can be attached to the swing member 172 to provide elastic force to the swing member 172, so as to drive the swing member 172 to have a tendency to rotate relative to the support member 13, thereby enabling the tension roller 171 to provide tension to the electrode 200.

[0118] The oscillating component 172 is rotatably connected to the support component 13 around the first axis. The tension roller 171 is connected to the oscillating component 172 and their axes are parallel. In conjunction with the force-applying component 173, a force with a rotational tendency is applied to the oscillating component 172, allowing the tension roller 171 to adaptively adjust its position according to the tension fluctuations of the electrode 200. When the electrode 200 experiences momentary slack, the force of the force-applying component 173 drives the oscillating component 172 to rotate, pushing the tension roller 171 closer to the electrode 200, thus promptly compensating for the tension gap and tightening the electrode 200. When the tension of the electrode 200 increases momentarily, the tension of the electrode 200 can overcome part of the force of the force-applying component 173, causing the oscillating component 172 to rotate in the opposite direction, buffering the tension impact, thereby always maintaining the tension of the electrode 200 stable and reducing the possibility of tearing of the electrode 200 due to sudden tension increase or slack and wrinkling due to insufficient tension.

[0119] In some embodiments, please refer to Figure 2 The electrode stretching device 100 also includes at least one guide roller 40, which is configured to convey the electrode 200 and guide the electrode 200 so that the electrode 200 can be conveyed according to a preset conveying path.

[0120] In some embodiments, please refer to Figure 2 The electrode stretching device 100 also includes a pair of coating rollers 30, which are used to roll the region of the electrode 200 with the active material layer. The coating rollers 30 are located between the drawing roller 21 and the tension roller assembly 17, which may be located downstream of the roller assembly 12.

[0121] For ease of explanation, the following embodiments use a battery production system from some embodiments of this application as an example.

[0122] The battery production system includes the electrode stretching device 100 of the above embodiments.

[0123] Since the battery production system includes all the technical features of the electrode stretching device 100 in the above embodiments, the effect is the same as described above, and will not be repeated here.

[0124] In one specific alternative embodiment of the electrode stretching apparatus 100, the electrode stretching apparatus 100 includes a calendering mechanism 10 and a drawing mechanism 20. The calendering mechanism 10 has an input side and an output side facing away from each other, and includes a support roller 11 and a pressure roller assembly 12, which are configured to jointly calender a portion of the blank area 210 of the electrode 200. The drawing mechanism 20 is located on the output side and includes a drawing roller 21, the outer peripheral surface of which has a drawing area 2111, which is configured to draw the remaining blank area 210 after calendering.

[0125] There are multiple pressure roller assemblies 12, with multiple drawing zones 2111 spaced apart along the axial direction of the drawing roller 21, and multiple pressure roller assemblies 12 spaced apart along the axial direction of the pressure roller assembly 12. Each pressure roller assembly 12 corresponds to one drawing zone 2111. The electrode sheet 200 has multiple blanking zones 210 spaced apart along the axial direction of the pressure roller assembly 12. Different pressure roller assemblies 12 are configured to co-calculate a portion of different blanking zones 210 with the support roller 11, and each drawing zone 2111 is configured to draw the remaining portion of each blanking zone 210 after calendering.

[0126] The pressure roller assembly 12 includes pressure rollers 121. Along the axial direction of the pressure roller assembly 12, each pressure roller 121 has a size of W1 for the blank area 210 of the roll pressing portion, and a size of W2 for each drawing area 2111, wherein the ratio of W2 / W1 ranges from 1 / 4 to 2 / 3. Along the axial direction of the pressure roller assembly 12, the size of the blank area 210 of the electrode 200 is W3, and W1 is configured to be equal to (0.6 ~ 0.8) * W3.

[0127] The outer peripheral surface of the drawing roll 21 has a plurality of protrusions 211 surrounding the axis of the drawing roll 21. Each protrusion 211 has a drawing area 2111 on its outer peripheral surface, and each protrusion 211 corresponds to a pressure roll 121.

[0128] The calendering mechanism 10 also includes a support member 13, an adjusting valve 143, a tension roller assembly 17, and multiple hydraulic drive assemblies 14. The support member 13 is rotatably connected to a support roller 11, and the pressure roller assembly 12 is slidably connected to the support member 13 along a first direction X. The pressure roller assembly 12 is configured to be driven to calender a portion of the blank area 210 together with the support roller 11. The first direction X intersects the axial direction of the pressure roller assembly 12.

[0129] The hydraulic drive assembly 14 includes a hydraulic actuator 141 and a pneumatic-hydraulic booster mechanism 142. The booster port of the pneumatic-hydraulic booster mechanism 142 is connected to the inlet port of the hydraulic actuator 141. The hydraulic actuator 141 is driven and connected to the pressure roller assembly 12. The hydraulic actuator 141 is used to drive the pressure roller assembly 12 to move relative to the support roller 11 along a first direction X. Multiple hydraulic actuators 141 are spaced apart along the axial direction of the support roller 11. Each hydraulic actuator 141 is driven and connected to a pressure roller assembly 12. Each hydraulic actuator 141 corresponds to a pneumatic-hydraulic booster mechanism 142 and is connected to the booster port of each pneumatic-hydraulic booster mechanism 142. The air inlet port of each pneumatic-hydraulic booster mechanism 142 is connected to a regulating valve 143. The air inlets of each regulating valve 143 are interconnected. The regulating valve 143 is used to regulate the gas flow rate and / or velocity at the air inlet port.

[0130] Tension roller assembly 17 is disposed on support member 13, downstream of pressure roller assembly 12 and upstream of drawing mechanism 20, and is used to provide tension to electrode sheet 200. Tension roller assembly 17 includes oscillating member 172, tension roller 171, and force-applying member 173. Oscillating member 172 is rotatably connected to support member 13 about a first axis. Tension roller 171 is connected to oscillating member 172, and the axis of tension roller 171 is parallel to the first axis. Force-applying member 173 is connected to oscillating member 172 and is used to drive oscillating member 172 to rotate relative to support member 13. Force-applying member 173 is a cylinder.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode stretching device, characterized in that, include: A calendering mechanism has an input side and an output side facing away from each other. The input side is used to receive an input electrode sheet. The calendering mechanism includes a support member, a support roller, and a pressure roller assembly. The support roller and the pressure roller assembly are both disposed on the support member. The pressure roller assembly includes a pressure roller. The support roller and the pressure roller are configured to jointly calender a portion of the blank area of ​​the electrode sheet. A drawing mechanism, located on the output side, includes a drawing roll with a drawing area on its outer peripheral surface. The drawing area is configured to draw the blank area remaining after calendering. At least one protrusion is formed on the outer peripheral surface of the drawing roll around its axis. The drawing area is formed on the outer peripheral surface of each protrusion, and each protrusion corresponds to one pressure roll.

2. The electrode stretching device according to claim 1, characterized in that, The number of pressure roller assemblies is at least one, and each pressure roller assembly corresponds to one drawing zone. Along the axial direction of the pressure roller assembly, the size of the blank area for rolling the portion of the pressure roller is W1, and the size of each drawing zone is W2, wherein the ratio of W2 / W1 ranges from 1 / 4 to 2 / 3.

3. The electrode stretching device according to claim 2, characterized in that, Along the axial direction of the pressure roller assembly, the size of the blank area of ​​the electrode sheet is W3, and W1 is configured to be equal to (0.6~0.8)*W3.

4. The electrode stretching device according to claim 2, characterized in that, The number of drawing zones and the number of pressure roller assemblies are both multiple. The multiple drawing zones are spaced apart along the axial direction of the pressure roller assemblies. The multiple pressure roller assemblies are spaced apart along the axial direction of the pressure roller assemblies. The electrode sheet has multiple blanking zones spaced apart along the axial direction of the pressure roller assemblies. Different pressure roller assemblies are configured to co-calculate a portion of different blanking zones with the support roller. Each drawing zone is configured to draw the remaining portion of each blanking zone after calendering.

5. The electrode stretching device according to any one of claims 1-4, characterized in that, The support member is rotatably connected to the support roller, and the pressure roller assembly is slidably connected to the support member along a first direction. The pressure roller assembly is configured to be driven to jointly calculate a portion of the blank area with the support roller. The first direction intersects the axial direction of the pressure roller assembly.

6. The electrode stretching device according to claim 5, characterized in that, The rolling mechanism further includes: The hydraulic drive assembly includes a hydraulic actuator and a pneumatic-hydraulic booster mechanism. The booster port of the pneumatic-hydraulic booster mechanism is connected to the oil inlet of the hydraulic actuator. The hydraulic actuator is driven to drive the pressure roller assembly to move relative to the support roller along the first direction.

7. The electrode stretching device according to claim 6, characterized in that, The number of pressure roller assemblies is multiple, and the multiple pressure roller assemblies are spaced apart along the axial direction of the support roller. The number of hydraulic actuators is also multiple, and the multiple hydraulic actuators are spaced apart along the axial direction of the support roller. Each hydraulic actuator drives and connects to one of the pressure roller assemblies. Each hydraulic actuator corresponds to one of the gas-liquid booster mechanisms and is connected to the booster oil port of each gas-liquid booster mechanism.

8. The electrode stretching device according to claim 7, characterized in that, The calendering mechanism also includes a regulating valve. The air inlet port of each gas-liquid booster mechanism is connected to the regulating valve, and the air inlets of each regulating valve are interconnected. The regulating valve is used to regulate the gas flow rate and / or velocity of the air inlet port.

9. The electrode stretching device according to claim 5, characterized in that, The rolling mechanism further includes: The guide member, wherein the pressure roller assembly is slidably connected to the support member along the first direction via the guide member; An elastic element, one end of which abuts against the guide element and the other end of which abuts against the support member, the elastic force of which has a tendency to move the pressure roller assembly away from the support roller.

10. The electrode stretching apparatus according to any one of claims 1-4, characterized in that, The rolling mechanism further includes: A tension roller assembly is disposed on the support member, the tension roller assembly being located downstream of the pressure roller assembly and upstream of the drawing mechanism, the tension roller assembly being used to provide tension to the electrode sheet.

11. The electrode stretching device according to claim 10, characterized in that, The tension roller assembly includes: A swinging component is rotatably connected to the support component about a first axis; A tension roller is connected to the oscillating member, and the axis of the tension roller is parallel to the first axis. The force-applying component is connected to the swinging component. The force-applying component is used to drive the swinging component to rotate relative to the support component.

12. A battery production system, characterized in that, Includes the electrode stretching device as described in any one of claims 1-11.

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