Pole piece rolling clamp and roller press with same

Abstract

The utility model relates to a pole piece rolling clamp and a roller press with the pole piece rolling clamp, the pole piece rolling clamp comprises a supporting column and a stretching component, the supporting column is movably arranged, the diameter of the supporting column is the same as that of a transmission roller of the roller press, and the supporting column and the transmission roller are coaxially arranged; the stretching component comprises a plurality of stretching rings which are arranged in a stacked and sleeved mode, the outer diameter of each stretching ring is the same as the inner diameter of the adjacent stretching ring, the stretching component is arranged on the peripheral side of the supporting column in a sleeved mode, and the inner diameter of the stretching ring adjacent to the supporting column is the same as the outer diameter of the supporting column. The stretching part is movably arranged on the supporting column in the axis direction of the supporting column. The problems that in traditional rolling, the thickness and position of Teflon on a transmission roller need to be manually adjusted, and the production cost and time are greatly increased are solved.

Description

Technical Field

[0001] The present application relates to the technical field of roller presses, and in particular to a pole piece rolling fixture and a roller press having the same. Background Art

[0002] In recent years, with the rapid development of science and technology, people's requirements for material and spiritual levels have continued to increase, and global energy demand has also increased, resulting in the depletion of traditional energy and increasingly serious environmental pollution. Against this background, the new energy industry has gradually emerged, and new energy vehicles have become a potential means of transportation to replace traditional oil vehicles in the future. Lithium-ion batteries have many advantages such as high safety, long cycle life, wide temperature resistance, fast charging, strong endurance, and strong charge retention. They are widely used in electric vehicles, aerospace military-civilian integration, smart home energy storage, industry, construction, airports, e-commerce, and port logistics.

[0003] The manufacturing process of lithium-ion batteries has a great influence on the electrochemical performance of the battery. In the rolling process, the stretching effect of the pole piece, the flat appearance of the pole piece, the absence of bumps and wrinkles, etc. are crucial. In the traditional rolling process, the stretching effect of the pole piece affects the compaction density, and the compaction density has a very important influence on the electrochemical performance of the battery. If the compaction density is too small, the particle spacing is large, which is conducive to the free movement of lithium ions, but because the contact between the particles is not close enough, it is not conducive to the effective conduction of electrons, and it is easy to cause battery polarization during discharge; if the compaction density is too large, the electronic conductivity increases, but it will cause the ion channel to decrease or block, which is not conducive to the capacity. In addition, the polarization increases, the voltage decreases, and the capacity decreases accordingly. In the traditional rolling process, in order to improve the stretching effect of the pole piece, Teflon is wrapped around the roller at the edge of the pole piece material area. However, for different types of batteries, the position, number of layers and height of Teflon are different for this method, which requires constant adjustment, increasing production time and manpower, and also increases the loss of Teflon. Utility Model Content

[0004] The present application provides a pole piece rolling fixture and a rolling machine having the same, so as to solve the problem that the thickness and position of Teflon on the transmission roller need to be manually adjusted in the traditional rolling process, which greatly increases the production cost and time.

[0005] In a first aspect, the present application provides a pole piece rolling fixture, comprising:

[0006] A support column, wherein the support column is movably arranged, the diameter of the support column is the same as the diameter of the driving roller of the roller press, and the support column is coaxially arranged; and

[0007] The stretching component includes a plurality of stretching rings, each of which is stacked and sleeved, and the outer diameter of the stretching ring is the same as the inner diameter of the adjacent stretching ring. The stretching component is sleeved on the outer peripheral side of the support column, and the inner diameter of the stretching ring adjacent to the support column is the same as the outer diameter of the support column. The stretching component is movably arranged on the support column along the axial direction of the support column.

[0008] In a possible implementation, two adjacent stretch rings are connected via a locking piece.

[0009] In a possible implementation, the stretch ring is provided with a connecting hole along its radial direction, and two ends of the locking member are respectively embedded in the connecting holes of two adjacent stretch rings.

[0010] In a possible implementation manner, the material of the locking member is the same as that of the stretch ring.

[0011] In a possible implementation, a driving mechanism is further included, and a movable end of the driving mechanism is connected to the supporting column.

[0012] In a possible implementation, the material of the stretch ring includes Teflon.

[0013] In a possible implementation, each of the stretch rings is provided with an identification piece, and the identification piece is used for differentiation.

[0014] In a second aspect, the present application provides a rolling machine, comprising the pole piece rolling fixture as described in the first aspect.

[0015] In a possible implementation, it includes a frame on which a plurality of transmission rollers arranged at intervals are rotatably arranged, a plurality of pole piece rolling clamps are arranged on the frame, and each support column of each pole piece rolling clamp is arranged in one-to-one correspondence with each transmission roller.

[0016] In a possible implementation, the support column and the corresponding transmission roller are spaced apart in the axial direction of the transmission roller, and the support column is movably disposed along the axial direction of the transmission roller.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] The pole piece rolling fixture and the rolling machine having the same provided in this embodiment, when in use, move the support column to a position relative to the transmission roller, then set the support column and the transmission roller coaxially, and the end of the support column fits with the end of the transmission roller, and then select the required thickness of the stretching component according to the type of battery pole piece and the tension used, and then use the corresponding number of stretching rings. For example, if one stretching ring is required, move the innermost stretching ring, that is, the smallest diameter stretching ring, along the axis direction of the support column and toward the transmission roller until it is moved to the transmission roller, and adjust the position of the stretching ring in the axis direction of the transmission roller according to the width of the battery pole piece, so that the stretching ring is flush with the edge of the battery pole ear. When the stretching effect of the battery pole piece is not good, other thickness stretching components can be replaced, for example, two or three stretching rings can be selected to roll the battery pole piece. At the same time, when replacing the type of battery pole piece, you only need to select the stretch ring of appropriate thickness and adjust the horizontal position of the stretch ring, which saves the manpower and time of manual replacement of Teflon, and also avoids the safety hazards when manually replacing Teflon. In addition, it also reduces the loss of traditional winding Teflon, thereby reducing production costs to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0022] Figure 1 A schematic diagram of the overall structure of a pole piece rolling fixture provided in an embodiment of the present application.

[0023] Figure 2 A schematic diagram of the structure of a support column in a pole piece rolling fixture provided in an embodiment of the present application.

[0024] Figure 3 A schematic diagram of the structure of a stretching ring in a pole piece rolling fixture provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 1. Support column; 2. Tension ring; 3. Locking piece; 4. Connection hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0030] Reference Figure 1-Figure 3 , the embodiment of the present application provides a pole piece rolling fixture, comprising:

[0031] A support column 1, wherein the support column 1 is movably arranged, the diameter of the support column 1 is the same as the diameter of the driving roller of the roller press, and the support column 1 is coaxially arranged; and

[0032] The stretching component includes a plurality of stretching rings 2, each of which is stacked and sleeved, and the outer diameter of the stretching ring 2 is the same as the inner diameter of the adjacent stretching ring 2. The stretching component is sleeved on the outer peripheral side of the support column 1, and the inner diameter of the stretching ring 2 adjacent to the support column 1 is the same as the outer diameter of the support column 1. The stretching component is movably arranged on the support column 1 along the axial direction of the support column 1.

[0033] When in use, move the support column 1 to a position opposite to the transmission roller, then set the support column 1 and the transmission roller coaxially, and the end of the support column 1 fits with the end of the transmission roller. Then, according to the type of battery pole piece and the tension used, select the stretching component of the required thickness, and then use the corresponding number of stretching rings 2. For example, if one stretching ring 2 is required, move the innermost stretching ring 2 with the smallest diameter along the axis of the support column 1 and move it toward the transmission roller until it is moved to the transmission roller, and adjust the position of the stretching ring 2 in the axis of the transmission roller according to the width of the battery pole piece, so that the stretching ring 2 is flush with the edge of the battery pole ear. When the stretching effect of the battery pole piece is not good, other stretching components of other thicknesses can be replaced, for example, two or three stretching rings 2 are selected to roll the battery pole piece. At the same time, when replacing the type of battery electrode, you only need to select a stretch ring 2 of appropriate thickness and adjust the horizontal position of the stretch ring 2, which saves manpower and time for manual replacement of Teflon, and also avoids the safety hazards when manually replacing Teflon. In addition, it also reduces the loss of traditional winding Teflon, thereby reducing production costs to a certain extent.

[0034] The material of the stretch ring 2 includes Teflon, which is polytetrafluoroethylene, commonly known as the "king of plastics". It is a high molecular polymer made by polymerizing tetrafluoroethylene as a monomer, with a chemical formula of (C2F4)n. It has excellent heat resistance and cold resistance and can be used for a long time at -180 to 260°C. This material has the characteristics of acid and alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance and its friction coefficient is extremely low, so it can be used as a lubricant.

[0035] In some embodiments, two adjacent stretching rings 2 are connected by a locking piece 3, and the two adjacent stretching rings 2 are fixed by the locking piece 3. While ensuring the stretching effect of the stretching component on the battery pole piece, the stability of the stretching component can also be ensured, thereby further improving the stretching effect on the battery pole piece.

[0036] Optionally, the material of the locking piece 3 is the same as that of the stretching ring 2, which can ensure a stable connection between adjacent stretching rings 2 and avoid damage to the stretching ring 2. In addition to achieving the fixing function, the locking piece 3 can also serve as a part of the stretching ring 2 to stretch the battery electrode, thereby achieving a stretching effect.

[0037] Specifically, the stretch ring 2 is provided with a connecting hole 4 along its radial direction, and both ends of the locking member 3 are respectively embedded in the connecting holes 4 of two adjacent stretch rings 2, so that the two stretch rings 2 are fixedly connected by the embedding of the locking member 3.

[0038] It can be known that the thickness of each stretching ring 2 can be the same. When stretching components of different thicknesses are required, different numbers of stretching rings 2 can be selected to cooperate with each other. Of course, the thickness of each stretching ring 2 can also be different, so as to achieve stretching components of different thicknesses after stacking, meeting the application requirements of different battery models, etc.

[0039] In this application, the thickness of each stretch ring 2 is the same as an example, and the number of stretch rings 2 is set to three as an example for description. For the convenience of distinction, the stretch rings 2 arranged in sequence in the radial direction of the support column 1 are the first ring, the second ring and the third ring. Correspondingly, there need to be two locking members 3, namely the first locking and the second locking, wherein the first locking is used to fix the first ring and the second ring, and the second locking is used to fix the second ring and the third ring. Among them, the inner diameter of the first ring is the same as the outer diameter of the support column 1 and the same as the outer diameter of the transmission roller. The length of the first locking is the same as the thickness of the stretch ring 2, wherein half of the first locking length is embedded in the connection hole 4 of the first ring, and the other half of the first locking length is embedded in the connection hole 4 of the second ring, so that the first ring and the second ring are fixed by the first locking. Similarly, the length of the second locking is the same as the thickness of the stretch ring 2, half of the second locking length is embedded in the connection hole 4 of the second ring, and the other half of the second locking length is embedded in the connection hole 4 of the third ring. When one of the stretch rings 2 of different thickness is selected for use, the other two stretch rings 2 are moved to the other end edge of the support column 1 for fixation.

[0040] In some embodiments, each of the stretch rings 2 is provided with an identification piece, and the identification piece is used for differentiation, and the thickness and / or inner diameter size of each stretch ring 2 can be distinguished by the setting of the identification piece. Optionally, the identification piece includes a stretch ring 2 prepared by raw materials of different colors, and the raw materials of each stretch ring 2 are the same, so that each stretch ring 2 after preparation can achieve the stretching effect, but the colors between the stretch rings 2 are complementary and the same, so as to distinguish them. Of course, the identification piece can also be other styles, such as a label or mark set on the stretch ring 2. It can be known that the setting of the identification piece should be located outside the part where the stretch ring 2 contacts the battery pole piece, and can be observed by the technician, so as to ensure the distinction of the technician and avoid damage to the battery pole piece.

[0041] In some embodiments, the pole piece rolling fixture further includes a driving mechanism, the movable end of which is connected to the support column 1; the driving mechanism drives the support column 1 to move synchronously by moving the movable end. When the battery pole piece needs to be stretched, the end of the support column 1 is aligned with the end of the transmission roller, so that the stretching ring 2 on the support column 1 is moved to the transmission roller. During the operation of the transmission roller, the driving mechanism moves the support column 1 to other positions to avoid interfering with the movement of the transmission roller.

[0042] Of course, in order to improve the reliability of the stretching ring 2 being located on the transmission roller, the stretching ring 2 and the transmission roller can also be connected by a connecting assembly, and the connecting assembly includes a first connecting member and a second connecting member that are embedded and matched, and one of the first connecting member and the second connecting member is arranged on the stretching ring 2, and the other is arranged on the transmission roller. Taking the example that the first connecting member is arranged on the stretching ring 2 and the second connecting member is arranged on the transmission roller, the reliability of the position of the stretching ring 2 can be improved by an embedded and matched manner. In addition, in order to ensure the stable movement of the stretching ring 2, a second connecting member is also provided on the support column 1. Of course, the stretching ring 2 with the first connecting member described above is the stretching ring 2 with the smallest inner diameter among the multiple stretching rings 2, that is, the stretching ring 2 used for contact and matching with the support column 1 and the transmission roller, and the remaining stretching rings 2 can be matched with each other through the locking member 3.

[0043] In summary, in the pole piece rolling process, after the pole piece is threaded, the required Teflon thickness is selected according to the type of battery pole piece and the tension used, and then the corresponding stretching ring 2 is used. Then the horizontal position of the stretching ring 2 is adjusted according to the width of the pole piece so that it is flush with the edge of the pole ear. When the pole piece stretching effect is not good, stretching rings 2 of other Teflon thickness types can be replaced for rolling. At the same time, when changing the type of battery pole piece, you only need to select a suitable stretching ring 2 and adjust the horizontal position of the stretching ring 2, which saves manpower and time for manual replacement of Teflon, and also avoids the safety hazards when manually replacing Teflon. In addition, it also reduces the loss of traditional winding Teflon, thereby reducing production costs to a certain extent.

[0044] This solves the problem that when rolling different types of battery pole pieces, the thickness and position of the Teflon on the transmission roller need to be manually adjusted, which greatly increases production costs and time; it also solves the problem that the Teflon is easily wrinkled during the replacement process, which causes the pole piece to be folded, and the Teflon loss during the rolling process is large. In addition, it also solves the problem that in the traditional rolling process, the Teflon is manually wrapped on the transmission roller at the edge of the pole piece material area, which poses certain safety hazards.

[0045] Reference Figure 1-Figure 3 , an embodiment of the present application further provides a rolling machine, comprising the pole piece rolling fixture described in the aforementioned embodiment.

[0046] The roller press comprises a frame on which a plurality of transmission rollers arranged at intervals are rotatably arranged, a plurality of pole piece rolling fixtures are arranged on the frame, and each support column 1 of each pole piece rolling fixture is arranged in one-to-one correspondence with each transmission roller.

[0047] The support column 1 and the corresponding transmission roller are arranged at intervals in the axial direction of the transmission roller, and the support column 1 is movably arranged along the axial direction of the transmission roller; the driving mechanism includes a cylinder or an electric push rod, etc., and taking the driving mechanism as a cylinder as an example, the piston rod of the cylinder is fixedly connected to one end of the support column 1, so the extension and contraction of the cylinder piston rod will drive the reciprocating movement of the support column 1. Among them, the cylinder piston rod is extended along the axial direction of the transmission roller, so the support column 1 can move in the direction close to or away from the transmission roller.

[0048] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0049] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0050] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A pole piece rolling fixture, characterized in that: include: A support column, wherein the support column is movably arranged, the diameter of the support column is the same as the diameter of the driving roller of the roller press, and the support column is coaxially arranged; and The stretching component includes a plurality of stretching rings, each of which is stacked and sleeved, and the outer diameter of the stretching ring is the same as the inner diameter of the adjacent stretching ring. The stretching component is sleeved on the outer peripheral side of the support column, and the inner diameter of the stretching ring adjacent to the support column is the same as the outer diameter of the support column. The stretching component is movably arranged on the support column along the axial direction of the support column.

2. The pole piece rolling fixture according to claim 1, characterized in that: Two adjacent stretching rings are connected via a locking piece.

3. The pole piece rolling fixture according to claim 2, characterized in that: The stretch ring is penetrated with a connecting hole along its radial direction, and the two ends of the locking member are respectively embedded in the connecting holes of two adjacent stretch rings.

4. The pole piece rolling fixture according to claim 2, characterized in that: The material of the locking piece is the same as that of the stretch ring.

5. The pole piece rolling fixture according to claim 1, characterized in that: It also includes a driving mechanism, wherein the movable end of the driving mechanism is connected to the supporting column.

6. The pole piece rolling fixture according to any one of claims 1 to 5, characterized in that: The material of the stretch ring includes Teflon.

7. The pole piece rolling fixture according to any one of claims 1 to 5, characterized in that: Each of the stretch rings is provided with an identification piece, and the identification piece is used for differentiation.

8. A roller press, characterized in that: It comprises a pole piece rolling fixture as described in any one of claims 1 to 7.

9. The roller press according to claim 8, characterized in that It comprises a frame, on which a plurality of transmission rollers arranged at intervals are rotatably arranged, a plurality of pole piece rolling clamps are arranged on the frame, and each supporting column of each pole piece rolling clamp is arranged in one-to-one correspondence with each transmission roller.

10. The roller press according to claim 9, characterized in that The support column and the corresponding transmission roller are arranged at intervals in the axial direction of the transmission roller, and the support column is movably arranged along the axial direction of the transmission roller.

Images