Battery pole piece rolling and stretching equipment

Abstract

The utility model relates to the technical field of rolling equipment, and provides battery pole piece rolling and stretching equipment, which comprises a base and a composite compression roller which is arranged on the base and is used for deviating from one end of the ground, and the composite compression roller comprises a first compression roller and a second compression roller which are arranged in parallel at an interval; the first compression roller comprises a plurality of concentric foil rolling sections and coating area rolling sections, the foil rolling sections are arranged at intervals in the length direction of the first compression roller so as to be matched with the second compression roller to roll blank foil areas of electrode plates, and one coating area rolling section is arranged between every two foil rolling sections; the first pressing roller is matched with the second pressing roller to roll the coating area of the electrode plate, and the outer diameter of the rolling section of the coating area is smaller than that of the foil rolling section. The utility model aims to provide the rolling and stretching equipment for the battery pole piece, which can roll the blank foil area of the pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling equipment, in particular to a battery pole piece rolling and stretching device. Background Art

[0002] The battery pole sheet roller is an important equipment for making battery pole sheets. It is used to roll the positive and negative pole sheets of lithium batteries to the thickness required by the process for assembly. At the same time, it compacts the pole sheets to increase the density of the pole sheets, thereby increasing the energy density of the battery.

[0003] Currently, the roller structure of common battery electrode sheet rolling machines is relatively simple, usually a cylindrical body with a uniform surface. During the rolling process, only the coated area on the electrode sheet can be rolled, and the blank foil area of ​​the electrode sheet cannot be rolled. As a result, the uncoated blank foil area of ​​the electrode sheet cannot be stress-released, which easily causes wrinkles, seriously affecting the quality of the electrode sheet, resulting in a decrease in the yield rate of the electrode sheet and a large amount of waste of raw materials. Therefore, it is necessary to propose a battery electrode sheet rolling and stretching device that can roll the blank foil area of ​​the electrode sheet. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery pole piece rolling and stretching device capable of rolling the blank foil area of ​​the pole piece.

[0005] To achieve the above-mentioned purpose, the battery electrode sheet rolling and stretching equipment proposed in the present invention includes a base and a composite pressing roller installed on the base for one end facing away from the ground, the composite pressing roller includes a first pressing roller and a second pressing roller arranged in parallel and spaced apart, the first pressing roller includes a plurality of concentrically arranged foil rolling sections and coating area rolling sections, each of the foil rolling sections is spaced apart along the length direction of the first pressing roller to cooperate with the second pressing roller to roll the blank foil area of ​​the electrode sheet, a coating area rolling section is arranged between every two foil rolling sections to cooperate with the second pressing roller to roll the coating area of ​​the electrode sheet, and the outer diameter of the coating area rolling section is smaller than the outer diameter of the foil rolling section.

[0006] Preferably, the connection between the coating area rolling section and the foil rolling section is a chamfered transition structure, and the chamfered transition structure is used for rolling the insulating glue areas on both sides of the coating area of ​​the electrode sheet.

[0007] Preferably, the first pressing roller includes four foil rolling sections and three coating area rolling sections, and the first pressing roller is sequentially provided with a first foil rolling section, a first coating area rolling section, a second foil rolling section, a second coating area rolling section, a third foil rolling section, a third coating area rolling section and a fourth foil rolling section along the length direction.

[0008] Preferably, connecting holes for connecting to the driving structure are respectively formed at both ends of the first pressure roller, the connecting holes are concentrically arranged with the first pressure roller, the first pressure roller is hollow, and the inner wall surfaces between the two ends of the first pressure roller are combined to form a hollow space, one end of the hollow space is connected to one of the connecting holes, and the other end of the hollow space is connected to the other connecting hole.

[0009] Preferably, the lengths of the respective coating area rolling sections are consistent, the lengths of the second foil rolling section and the third foil rolling section are consistent, the lengths of the first foil rolling section and the fourth foil rolling section are consistent, the first foil rolling section is used to form a connecting hole at one end away from the first coating area rolling section, and the fourth foil rolling section is used to form another connecting hole at one end away from the third coating area rolling section.

[0010] Preferably, the maximum roughness Ra of the outer wall surface of the first pressing roller is 0.04 mm, and the circular run-out deviation of the outer wall surface of the first pressing roller is ±3 μm.

[0011] Preferably, the first pressing roller is a steel structure, and the outer wall surface of the first pressing roller is provided with a chrome plating layer, and the thickness of the chrome plating layer is at least 0.05 mm.

[0012] Preferably, the outer diameter of the foil rolling section is 120.0 mm to 120.4 mm, and the outer diameter of the coating area rolling section is 121.3 mm to 121.4 mm.

[0013] Preferably, the connecting hole includes a first through hole and a second through hole arranged concentrically, the first through hole is arranged close to the corresponding connecting hole, the second through hole is arranged away from the corresponding connecting hole, and the diameter of the first through hole is larger than the diameter of the second through hole.

[0014] Preferably, the base includes a bottom plate, a frame vertically connected to the top of the bottom plate, and the composite pressing roller connected to the top of the frame, and the first pressing roller and the second pressing roller can approach or move away from each other to adjust the roller axis spacing between the first pressing roller and the second pressing roller.

[0015] In the technical solution of the present invention, by setting the first pressing roller, the first pressing roller includes a plurality of concentrically arranged foil rolling sections and coating area rolling sections. When it is necessary to roll the electrode sheet, the coating area rolling section cooperates with the second pressing roller to roll the coating area of ​​the electrode sheet with a larger thickness. At the same time, since the outer diameter of the foil rolling section is larger than the outer diameter of the coating area rolling section, the foil rolling section can cooperate with the second pressing roller to roll the blank foil area of ​​the electrode sheet with a smaller thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the first pressing roller of an embodiment of the battery pole piece rolling and stretching equipment of the present utility model;

[0018] Figure 2 is a front view of the first pressing roller;

[0019] Figure 3 It is a cross-sectional view of the first pressing roller.

[0020] Description of Figure Numbers:

[0021] 1-first pressing roller; 11-foil rolling section; 11a-first foil rolling section; 11b-second foil rolling section; 11c-third foil rolling section; 11d-fourth foil rolling section; 12-coating area rolling section; 12a-first coating area rolling section; 12b-second coating area rolling section; 12c-third coating area rolling section; 13-chamfered structure; 14-connecting hole; 15-hollow space.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0026] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0027] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0028] The utility model provides a battery pole piece rolling and stretching device.

[0029] Please refer to Figures 1 to 3 The battery electrode sheet rolling and stretching equipment includes a base and a composite roller mounted on the base with one end facing away from the ground. The composite roller includes a first roller 1 and a second roller arranged in parallel and spaced apart. The first roller 1 includes multiple concentrically arranged foil rolling sections 11 and coating area rolling sections 12. Each foil rolling section 11 is spaced along the length of the first roller 1 to cooperate with the second roller in rolling the blank foil area of ​​the electrode sheet. A coating area rolling section 12 is provided between every two foil rolling sections 11 to cooperate with the second roller in rolling the coating area of ​​the electrode sheet. The outer diameter of the coating area rolling section 12 is smaller than that of the foil rolling section 11. Specifically, the foil rolling section 11 and the coating area rolling section 12 are both cylindrical structural members.

[0030] In the technical solution of the present invention, by setting the first pressing roller 1, the first pressing roller 1 includes a plurality of concentrically arranged foil rolling sections 11 and coating area rolling sections 12. When it is necessary to roll the electrode sheet, the coating area rolling section 12 cooperates with the second pressing roller to roll the coating area of ​​the electrode sheet with a larger thickness. At the same time, since the outer diameter of the foil rolling section 11 is larger than the outer diameter of the coating area rolling section 12, the foil rolling section 11 can cooperate with the second pressing roller to roll the blank foil area of ​​the electrode sheet with a smaller thickness.

[0031] Preferably, the connection between the coating area rolling section 12 and the foil rolling section 11 is a chamfered transition structure 13, which is used to roll the insulating adhesive areas on both sides of the coating area of ​​the electrode sheet. In this embodiment, the chamfer size is C5*0.6mm-C8*0.6mm.

[0032] Preferably, the first pressing roller 1 includes four foil rolling sections 11 and three coating area rolling sections 12. The first pressing roller 1 is provided with a first foil rolling section 11a, a first coating area rolling section 12a, a second foil rolling section 11b, a second coating area rolling section 12b, a third foil rolling section 11c, a third coating area rolling section 12c, and a fourth foil rolling section 11d in sequence along its length. Specifically, the number of foil rolling sections 11 and coating area rolling sections 12 provided on the first pressing roller 1 is determined based on actual conditions.

[0033] Preferably, connection holes 14 for connecting to a drive structure are formed at both ends of the first press roller 1. The connection holes 14 are concentrically arranged with the first press roller 1. The first press roller 1 is hollow, and the inner wall surface between the two ends of the first press roller 1 encloses a hollow space 15. One end of the hollow space 15 is connected to one of the connection holes 14, and the other end of the hollow space 15 is connected to the other connection hole 14. In this embodiment, the hollow space 15 is a cylindrical space, and the central axis of the hollow space 15 coincides with the central axis of the first press roller 1.

[0034] Preferably, the lengths of the coating area rolling sections 12 are consistent, the lengths of the second foil rolling section 11b and the third foil rolling section 11c are consistent, and the lengths of the first foil rolling section 11a and the fourth foil rolling section 11d are consistent. The first foil rolling section 11a has one connection hole 14 formed at one end thereof that faces away from the first coating area rolling section 12a, and the fourth foil rolling section 11d has another connection hole 14 formed at one end thereof that faces away from the third coating area rolling section 12c. Specifically, the length of each foil rolling section 11 is determined according to the width of the blank foil area of ​​the electrode piece, and the length of each coating area rolling section 12 is determined according to the width of the coating area of ​​the electrode piece.

[0035] Preferably, the maximum roughness Ra of the outer wall of the first pressing roller 1 is 0.04 mm, and the circular runout deviation of the outer wall of the first pressing roller 1 is ±3 μm. In this embodiment, the height of the first pressing roller 1 is higher than that of the second pressing roller.

[0036] Preferably, the first pressing roller 1 is a steel structure, and the outer wall surface of the first pressing roller 1 is provided with a chrome plating layer, and the thickness of the chrome plating layer is at least 0.05 mm. In this embodiment, the material of the first pressing roller 1 is 45 steel.

[0037] Preferably, the outer diameter of the foil rolling section 11 is 120.0 mm to 120.4 mm, and the outer diameter of the coating area rolling section 12 is 121.3 mm to 121.4 mm. Specifically, the outer diameter of each foil rolling section 11 is determined according to the thickness of the foil of the electrode sheet, and the outer diameter of the coating area rolling section 12 is determined according to the thickness of the coating area of ​​the electrode sheet.

[0038] Preferably, the connecting hole 14 includes a first through hole and a second through hole arranged concentrically, the first through hole is arranged close to the corresponding connecting hole 14, the second through hole is arranged away from the corresponding connecting hole 14, and the diameter of the first through hole is larger than the diameter of the second through hole.

[0039] Preferably, the base includes a bottom plate, a frame vertically connected to the top of the bottom plate, and the composite press roller connected to the top of the frame. The first press roller 1 and the second press roller can move closer to or farther from each other to adjust the roller axis spacing between the first press roller 1 and the second press roller. Providing the first press roller 1 and the second press roller that can move closer to or farther from each other facilitates adjustment of the roller axis spacing between the first press roller 1 and the second press roller to accommodate various electrode thicknesses.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A battery pole piece rolling and stretching device, characterized in that: It includes a base and a composite pressing roller installed on the base for facing away from the ground at one end, the composite pressing roller includes a first pressing roller and a second pressing roller arranged in parallel and spaced apart, the first pressing roller includes a plurality of concentrically arranged foil rolling sections and coating area rolling sections, each of the foil rolling sections is spaced apart along the length direction of the first pressing roller to cooperate with the second pressing roller to roll the blank foil area of ​​the electrode sheet, a coating area rolling section is arranged between every two foil rolling sections to cooperate with the second pressing roller to roll the coating area of ​​the electrode sheet, and the outer diameter of the coating area rolling section is smaller than the outer diameter of the foil rolling section.

2. The battery pole piece rolling and stretching equipment according to claim 1, characterized in that: The connection between the coating area rolling section and the foil rolling section is a chamfered transition structure, and the chamfered transition structure is used for rolling the insulating glue areas on both sides of the coating area of ​​the electrode sheet.

3. The battery pole piece rolling and stretching equipment according to claim 1, characterized in that: The first pressing roller includes four foil rolling sections and three coating area rolling sections. The first pressing roller is sequentially provided with a first foil rolling section, a first coating area rolling section, a second foil rolling section, a second coating area rolling section, a third foil rolling section, a third coating area rolling section and a fourth foil rolling section along the length direction.

4. The battery pole piece rolling and stretching equipment according to claim 3, characterized in that: Both ends of the first pressure roller are respectively formed with connection holes for connecting to the driving structure, the connection holes are concentrically arranged with the first pressure roller, the first pressure roller is hollow, and the inner wall surfaces between the two ends of the first pressure roller are combined to form a hollow space, one end of the hollow space is connected to one of the connection holes, and the other end of the hollow space is connected to the other connection hole.

5. The battery pole piece rolling and stretching equipment according to claim 4, characterized in that: The lengths of the respective coating area rolling sections are consistent, the lengths of the second foil rolling section and the third foil rolling section are consistent, the lengths of the first foil rolling section and the fourth foil rolling section are consistent, the first foil rolling section is used to form a connecting hole at one end away from the first coating area rolling section, and the fourth foil rolling section is used to form another connecting hole at one end away from the third coating area rolling section.

6. The battery pole piece rolling and stretching equipment according to claim 1, characterized in that: The maximum roughness Ra of the outer wall surface of the first pressing roller is 0.04 mm, and the circular run-out deviation of the outer wall surface of the first pressing roller is ±3 μm.

7. The battery pole piece rolling and stretching equipment according to claim 1, characterized in that: The first pressing roller is a steel structure. The outer wall surface of the first pressing roller is provided with a chrome plating layer. The thickness of the chrome plating layer is at least 0.05 mm.

8. The battery pole piece rolling and stretching equipment according to claim 1, characterized in that: The outer diameter of the foil rolling section is 120.0 mm to 120.4 mm, and the outer diameter of the coating area rolling section is 121.3 mm to 121.4 mm.

9. The battery pole piece rolling and stretching equipment according to claim 5, characterized in that: The connecting hole includes a first through hole and a second through hole arranged concentrically, the first through hole is arranged close to the corresponding connecting hole, the second through hole is arranged away from the corresponding connecting hole, and the diameter of the first through hole is larger than the diameter of the second through hole.

10. The battery pole piece rolling and stretching equipment according to any one of claims 1 to 9, characterized in that: The base includes a bottom plate, a frame vertically connected to the top of the bottom plate, and the composite pressing roller connected to the top of the frame. The first pressing roller and the second pressing roller can move closer to or farther away from each other to adjust the roller axis spacing between the first pressing roller and the second pressing roller.

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