Pole piece flattening device

Abstract

The utility model provides a pole piece flattening device which comprises flattening units symmetrically arranged in tab areas on two sides of an external pole piece, a first roller and a second roller in the flattening unit are arranged on the upper side and the lower side of the tab area of the external pole piece in parallel and are perpendicular to the conveying direction of the external pole piece, and the roller surfaces of the first roller and the second roller are respectively in contact with the upper side surface and the lower side surface of the tab area of the external pole piece; and when the pole piece passes through the space between the first roller and the second roller, wrinkles on a tab area of the pole piece can be flattened by the first roller and the second roller and are fed into the next process. And at least two groups of flattening units are sequentially arranged and mounted on each bracket along the conveying direction of the external pole pieces, so that the pole pieces conveyed to pass through the pole piece flattening device are sequentially flattened by the sequentially arranged flattening units. The distance between the first rollers and the second rollers in the flattening units arranged in the conveying direction of the external pole pieces is controlled, so that the first rollers and the second rollers are sequentially reduced in the conveying direction of the external pole pieces, the pole pieces are sequentially flattened in a reinforced mode, and the flattening effect is better.

Description

Technical Field

[0001] The present application belongs to the technical field of battery manufacturing, and specifically relates to a pole piece flattening device. Background Art

[0002] In the production process of lithium batteries, pole piece production is an important process. Pole pieces usually use foil as the substrate, and active materials are coated on the foil at intervals. The area coated with active materials is the coating area, and the area not coated with active materials is the lug area. During production, the pole pieces after coating need to be dried at high temperature to volatilize and remove the solvent in the coating material. The pole pieces that have undergone the drying process are prone to warping in the lug area due to the inconsistent shrinkage degree between the coating area and the lug area, and irregular wrinkles appear on the pole pieces. In the subsequent winding process, winding damage and broken belts will occur, which seriously affect product performance. Therefore, the pole pieces with warped lugs after drying need to be flattened before winding, so as to avoid damage to the pole pieces and improve the subsequent product qualification rate. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a pole piece flattening device to eliminate the wrinkles of the pole piece after drying and avoid the pole piece from shaking during transportation, so as to keep it in a fixed position in a stable state and enter the next process.

[0004] The pole piece flattening device provided in the present application comprises brackets symmetrically arranged at the pole ear regions on both sides of the external pole piece, each bracket comprises at least one flattening unit, and each flattening unit comprises a roller group;

[0005] The roller group consists of a first roller and a second roller;

[0006] The first roller and the second roller are arranged in parallel at the upper and lower sides of the external pole piece tab area and perpendicular to the conveying direction of the external pole piece;

[0007] The roller surface of the first roller is in contact with the upper side surface of the outer pole piece and the pole ear area;

[0008] The roller surface of the second roller is in contact with the lower side surface of the outer pole piece and the pole ear area;

[0009] The first roller and the second roller are rotatably connected to the bracket.

[0010] Furthermore, the flattening units are sequentially connected to the bracket along the conveying direction of the external pole pieces.

[0011] Furthermore, the distance between the first roller and the second roller decreases successively along the conveying direction of the external pole piece.

[0012] Furthermore, the bracket includes at least one supporting seat and a base frame, the supporting seat is detachably connected to the base frame; the supporting seat and the flattening unit correspond one to one; the first roller and the second roller are rotatably connected to the supporting seat.

[0013] Furthermore, the support seat includes a base, two support shafts and two bearings; one end of the support shaft is detachably connected to the base; the bearings correspond to the support shafts one by one and are sleeved on the support shafts; the first roller and the second roller are respectively sleeved on the other ends of the support shaft and are rotatably connected to the support shaft through the bearings.

[0014] Furthermore, a waist-shaped hole is provided on the base, and one end of the support shaft is connected to the base through the waist-shaped hole.

[0015] Furthermore, the spacing between the first roller and the second roller is 0.3 mm-1 mm.

[0016] This application has the following beneficial effects:

[0017] The present application provides a pole piece flattening device, which includes flattening units symmetrically arranged on the pole ear areas on both sides of the external pole piece, the first roller and the second roller in the flattening unit are arranged parallel to the upper and lower sides of the pole ear area of ​​the external pole piece and perpendicular to the conveying direction of the external pole piece, and the roller surfaces of the first roller and the second roller are in contact with the upper and lower side surfaces of the pole ear area of ​​the external pole piece respectively; when the pole piece passes between the first roller and the second roller, the wrinkles on the pole ear area of ​​the pole piece will be flattened by the first roller and the second roller and sent to the next process. At least two groups of flattening units are arranged in sequence on each bracket along the conveying direction of the external pole piece, so that the pole piece conveyed through the pole piece flattening device is flattened in sequence by the flattening units arranged in sequence. The spacing between the first roller and the second roller in the flattening unit arranged along the conveying direction of the external pole piece is controlled to be reduced in sequence along the conveying direction of the external pole piece, so that the pole piece is strengthened and flattened in sequence, and the flattening effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall schematic diagram of a pole piece flattening device provided in some embodiments of the present application,

[0019] Figure 2 is an overall schematic diagram of a pole piece flattening device provided in some embodiments of the present application,

[0020] Figure 3 It is a front view of a pole piece flattening device provided in some embodiments of the present application.

[0021] Description of reference numerals:

[0022] 100. Bracket,

[0023] 110. Support seat, 120. Base frame,

[0024] 111. Base, 112. Support shaft, 113. Bearing, 114. Waist hole,

[0025] 200. Roller set,

[0026] 210. First roller, 220. Second roller,

[0027] 201. Roller surface. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0029] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and other terms indicating direction or position relationship used herein are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, if there is a description of "first", "second", etc. in the embodiment of the utility model, the description of "first", "second", etc. is only for descriptive purposes, and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] like Figure 1 and Figure 2 As shown, the present application provides a pole piece flattening device, comprising a bracket 100 symmetrically arranged at the pole ear regions on both sides of the external pole piece, each bracket 100 includes at least one flattening unit, and each flattening unit includes a roller group 200; the roller group 200 is composed of a first roller 210 and a second roller 220; the first roller 210 and the second roller 220 are arranged in parallel at the upper and lower sides of the pole ear region of the external pole piece and perpendicular to the conveying direction of the external pole piece; the roller surface 201 of the first roller 210 contacts the upper side of the pole ear region of the external pole piece; the roller surface 201 of the second roller 220 contacts the lower side of the pole ear region of the external pole piece; the roller shaft 202 of the first roller 210 and the second roller 220 are rotatably connected to the bracket 100. The pole piece conveyed through the pole piece flattening device passes between the first roller and the second roller, and the wrinkles on the pole ear region are flattened by the first roller and the second roller and sent to the next process.

[0033] In some embodiments provided in the present application, the spacing between the first roller 210 and the second roller 220 is 0.3mm-1mm. At present, the electrode substrates commonly used in industry include aluminum foil and copper foil, with an aluminum foil thickness of 10-20μm and a copper foil thickness of 4.5-15μm. Different battery systems are configured with different positive and negative electrode slurry solvent ratios. There are certain differences in the degree of wrinkles produced by the electrode after coating and drying. The electrode sheets made of the above two types of foil materials can be flattened by the device provided in the present application. This device adjusts the spacing between the first roller 210 and the second roller 220 according to the degree of wrinkles of different electrode sheets, so that the corresponding electrode sheet can pass between the first roller 210 and the second roller 220 and the wrinkles on the pole ear area are flattened by the first roller 210 and the second roller 220 and sent to the next process.

[0034] In some embodiments provided in the present application, the flattening units are sequentially connected to the brackets 100 along the conveying direction of the external pole piece. In this embodiment, the pole piece flattening device includes two brackets 100 symmetrically arranged in the pole ear areas on both sides of the external pole piece. Along the conveying direction of the external pole piece, at least two groups of flattening units are sequentially arranged and installed on each bracket 100, so that the pole piece conveyed through the pole piece flattening device is flattened in sequence by the sequentially arranged flattening units. In this embodiment, the pole piece that has been flattened multiple times by the sequentially arranged flattening units has a better flattening effect, and the setting of at least two groups of flattening units limits the displacement of the pole piece up and down, so that the pole piece is more smoothly conveyed after passing through the pole piece flattening device, which is conducive to the next process.

[0035] In the preferred mode provided by the above embodiment, the spacing between the first roller 210 and the second roller 220 of the flattening unit arranged in sequence decreases in sequence along the conveying direction of the external pole piece. As the spacing between the roller groups gradually decreases along the conveying direction of the external pole piece, the flattening effect of the first roller 210 and the second roller 220 gradually increases, so that the external pole piece passing through the flattening units arranged in sequence is strengthened and flattened in sequence, and the flattening effect of the wrinkles is better. In an embodiment provided by this embodiment, there are two groups of flattening units arranged in sequence on each bracket 100, and the spacing between the first roller 210 and the second roller 220 in the first flattening unit arranged in front along the conveying direction of the external pole piece is 1mm, and the spacing between the first roller 210 and the second roller 220 in the second flattening unit arranged in the rear along the conveying direction of the external pole piece is 0.5mm. The above embodiment enables the two adjacent groups of rollers to cooperate in the secondary flattening of the pole piece, and the provision of two groups of roller groups reduces the shaking of the pole piece during the conveying process, which is conducive to the next step of the process.

[0036] In some embodiments provided in the present application, the support 100 of the pole piece flattening device includes at least one support seat 110 and a base frame 120, the support seat 110 is detachably connected to the base frame 120; the support seat 110 and the flattening unit correspond one to one; the first roller 210 and the second roller 220 are rotatably connected to the support seat 110. The support seat 110 is detachably connected to the base frame 120 to facilitate the disassembly and maintenance of the flattening unit. In this embodiment, the connection hole between the support seat 110 and the base frame 120 can be preferably designed as a waist-shaped hole. Through the design of the waist-shaped hole, the support seat 110 can adjust the fixed position on the base frame 120 up and down to fine-tune the relative height of the flattening unit on the support 100. In this embodiment, the height of the flattening unit is controlled to adapt to the position of pole pieces of different weights by adjusting the vertical sliding of the support seat 110 on the base frame 120.

[0037] In some embodiments provided in the present application, the support seat 110 includes a base 111, two support shafts 112 and two bearings 113; one end of the support shaft 112 is detachably connected to the base 111; the bearing 113 corresponds to the support shaft 112 one by one and is sleeved on the support shaft 112; the first roller 210 and the second roller 220 are respectively sleeved on the other end of the support shaft 112 and are rotatably connected to the support shaft 112 through the bearing 113. In this embodiment, the support shaft 112 is detachably connected to the base 111, which is convenient for disassembly and maintenance of the first roller 210 or the second roller 220. Preferably, the mounting hole of the support shaft 112 on the base 111 is designed as a waist-shaped hole, and the spacing between the first roller 210 and the second roller 220 can be flexibly adjusted as needed.

[0038] The above is a detailed introduction to a pole piece flattening device provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A pole piece flattening device, characterized in that: It comprises brackets (100) symmetrically arranged at the pole ear regions on both sides of the external pole piece, each bracket (100) comprising at least one flattening unit, and the flattening unit comprises a roller group (200); The roller assembly (200) consists of a first roller (210) and a second roller (220); The first roller (210) and the second roller (220) are arranged in parallel at the upper and lower sides of the external pole piece tab region and are perpendicular to the conveying direction of the external pole piece; The roller surface (201) of the first roller (210) is in contact with the upper side surface of the external pole piece and the pole ear region; The roller surface (201) of the second roller (220) contacts the lower side surface of the external pole piece and the pole ear region; The first roller (210) and the second roller (220) are rotatably connected to the bracket (100).

2. The pole piece flattening device according to claim 1, characterized in that: The flattening units are sequentially connected to the bracket (100) along the conveying direction of the external pole piece.

3. The pole piece flattening device according to claim 2, characterized in that: The spacing between the first roller (210) and the second roller (220) decreases sequentially along the conveying direction of the external pole piece.

4. The pole piece flattening device according to claim 1, characterized in that: The bracket (100) comprises at least one supporting seat (110) and a base frame (120), wherein the supporting seat (110) is detachably connected to the base frame (120); the supporting seat (110) and the flattening unit correspond one to one; and the first roller (210) and the second roller (220) are rotatably connected to the supporting seat (110).

5. The pole piece flattening device according to claim 4, characterized in that: The support seat (110) comprises a base (111), two support shafts (112) and two bearings (113); one end of the support shaft (112) is detachably connected to the base (111); the bearing (113) corresponds to the support shaft (112) one by one and is sleeved on the support shaft (112); the first roller (210) and the second roller (220) are respectively sleeved on the other end of the support shaft (112) and are rotatably connected to the support shaft (112) through the bearing (113).

6. The pole piece flattening device according to claim 5, characterized in that: The base (111) is provided with a waist-shaped hole (114), and one end of the support shaft (112) is connected to the base (111) through the waist-shaped hole (114).

7. The pole piece flattening device according to any one of claims 1 to 6, characterized in that: The distance between the first roller (210) and the second roller (220) is 0.3 mm-1 mm.

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