A full tab coated non-edge area thinning gasket

Abstract

The utility model provides a kind of full tab coating non-edge area thinning gasket, it is related to battery technical field, including gasket body, the coating width intermediate position of gasket body is equipped with material stop rib, the end of material stop rib is equipped with flow guide groove, gasket body is located between coating die and die lip.The utility model is equipped with material stop rib in the coating width intermediate position of gasket body, when gasket body is installed between coating die and die lip, material stop rib can form directional block to slurry in coating process, reduce the slurry accumulation amount of non-edge specified area, realize the accurate thinning of this area, make that the thinning area of positive pole piece after slitting can be accurately matched with the thinning area of negative pole piece, avoid the problem that the edge allowance is insufficient due to the mismatch of positive pole piece thickness and negative pole piece thickness, and the U-shaped flow guide groove of material stop rib end and material stop rib smooth transition, can guide slurry to flow smoothly, avoid slurry to be accumulated in the end of material stop rib and form coating defect, ensure that coating quality is stable.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a thinning pad for the non-edge area of ​​the full tab coating. Background Technology

[0002] Lithium-ion batteries have many advantages such as high energy density, high voltage platform, low self-discharge, and environmental friendliness, making them the preferred choice for green energy.

[0003] In the existing technology, in the production of full-tab battery cells, due to the flow of slurry in the extrusion coating machine, the coating edge area is normally lower than the middle area. Cylindrical lithium batteries normally adopt a slitting process. After the electrode sheets are slitting, one side of the edge electrode sheet has a normal thickness and the other side has a lower thickness. If the positive and negative electrode sheets cannot be matched, it will cause the normal side of the positive electrode sheet to match the thinner side of the negative electrode sheet. In the later stage, the edge allowance is insufficient, which easily leads to lithium deposition at the edge, causing safety hazards. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this invention is to solve the problem in the prior art that the thinning of the electrode edge is caused by the flow characteristics of the slurry in the extrusion coating machine, and the thinning areas of the positive and negative electrodes cannot be effectively matched after slitting, resulting in insufficient negative electrode margin and easy to cause safety hazards of edge lithium plating. Therefore, a thinning pad for non-edge areas of full tab coating is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a thinning pad for non-edge areas of full tab coating, comprising a pad body, wherein a baffle rib is provided in the middle of the coating width of the pad body, and a guide groove is provided at the end of the baffle rib, and the pad body is disposed between the coating die head and the die lip.

[0006] Preferably, the gasket body is made of stainless steel.

[0007] Preferably, the cross-section of the baffle rib is trapezoidal, and the baffle rib is arranged parallel to the coating direction.

[0008] Preferably, the guide channel is U-shaped, and there is a smooth transition between the guide channel and the baffle rib.

[0009] Preferably, the length of the baffle rib is consistent with the coating width of the die head.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, by setting a baffle rib in the middle of the coating width of the gasket body, when the gasket body is installed between the coating die head and the die lip, the baffle rib can form a directional block for the slurry during the coating process, reducing the amount of slurry accumulation in non-edge designated areas, achieving precise thinning in this area, so that the thinning area after the positive electrode sheet is cut can be precisely matched with the thinning area of ​​the negative electrode sheet, avoiding the problem of insufficient edge allowance caused by the mismatch of the thickness of the positive and negative electrode sheets. In addition, the U-shaped guide groove at the end of the baffle rib smoothly transitions with the baffle rib, which can guide the slurry to flow smoothly, avoid the slurry accumulation at the end of the baffle rib to form coating defects, and ensure stable coating quality. Attached Figure Description

[0011] Figure 1 A three-dimensional structural diagram of a non-edge region thinning pad coated with a full tab is provided for this utility model; Figure 2 A top view of a non-edge area thinning pad coated with a full tab is provided for this utility model; Figure 3 A cross-sectional view of a non-edge region thinning pad coated with a full tab is provided for this utility model.

[0012] Illustration: 1. Gasket body; 2. Material retaining rib; 3. Flow guide groove. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0014] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0015] Example 1: As Figures 1-3 As shown, this utility model provides a technical solution: a thinning pad for non-edge areas of full-tab coating, including a pad body 1, a baffle rib 2 is provided in the middle of the coating width of the pad body 1, and a guide groove 3 is provided at the end of the baffle rib 2. The pad body 1 is located between the coating die head and the die lip. The pad body 1 is made of stainless steel. The cross-section of the baffle rib 2 is trapezoidal. The baffle rib 2 is arranged parallel to the coating direction. The guide groove 3 is U-shaped. There is a smooth transition between the guide groove 3 and the baffle rib 2. The length of the baffle rib 2 is consistent with the coating width of the die head.

[0016] In this embodiment, the gasket body 1 is installed inside the die head of the extrusion coating machine, located between the die head body and the die lip. When the positive electrode slurry is extruded through the die head for coating, the slurry flows over the surface of the gasket body 1. The baffle rib 2 located in the middle area of ​​the coating width blocks part of the slurry, reducing the slurry flow in that area, thereby reducing the coating thickness at the corresponding position and forming a non-edge thinning zone extending along the coating direction. Since the length of the baffle rib 2 is consistent with the coating width of the die head, it ensures that the thinning zone is uniform and continuous along the entire electrode surface. When the slurry passes around the end of the baffle rib 2, the U-shaped guide groove 3 guides it to smoothly transition to both sides of the thinning zone, avoiding slurry accumulation or flow turbulence, and ensuring the flatness and thickness consistency of the coating edge.

[0017] The working principle of this embodiment is as follows: In use, the gasket body 1 is installed between the coating die head and the die lip. A baffle rib 2 is provided in the middle of the coating width of the gasket body 1. The baffle rib 2 is arranged parallel to the coating direction and has a trapezoidal cross section. Its length is consistent with the coating width of the die head, ensuring that the slurry flow is uniformly blocked throughout the coating process. When the positive electrode slurry is extruded through the die head for coating, the baffle rib 2 forms a directional block on the slurry flowing below it, reducing the slurry flow in non-edge designated areas, thereby achieving precise thinning in that area. At the same time, a U-shaped guide groove 3 is provided at the end of the baffle rib 2. The guide groove 3 and the baffle rib 2 are smoothly transitioned, which can guide the blocked slurry to flow smoothly to both sides, avoiding the slurry from accumulating at the end of the baffle rib 2 or generating turbulence.

[0018] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A full tab coated non-edge area thinning gasket comprising a gasket body (1) characterised in that: The gasket body (1) has a baffle rib (2) in the middle of the coating width, and a guide groove (3) is opened at the end of the baffle rib (2). The gasket body (1) is located between the coating die head and the die lip.

2. The full-tab coated non-edge area thinning gasket of claim 1, wherein: The gasket body (1) is made of stainless steel.

3. The full-tab coated non-edge area thinning gasket of claim 1, wherein: The cross-section of the baffle rib (2) is trapezoidal, and the baffle rib (2) is arranged parallel to the coating direction.

4. The full-tab coated non-edge area thinning gasket of claim 1, wherein: The guide channel (3) is U-shaped, and there is a smooth transition between the guide channel (3) and the baffle rib (2).

5. The full-tab coated non-edge area thinning gasket of claim 1, wherein: The length of the baffle rib (2) is consistent with the coating width of the die head.

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