Tool for improving folding of copper foil

Abstract

The utility model discloses a tool for improving copper foil folding, which comprises a tool body, the tool body comprises a fixed mounting plate and a negative pressure adsorption cavity, the fixed mounting plate is connected with the side wall of the negative pressure adsorption cavity, and the fixed mounting plate is provided with a fixed mounting hole and a maintenance arc-shaped abdicating hole; the end face, making contact with the copper foil, of the negative pressure adsorption cavity is a working end face, a plurality of adsorption holes are formed in the working end face, and the adsorption holes are communicated with a cavity body of the negative pressure adsorption cavity. An air exhaust hole is formed in the side wall of the negative pressure adsorption cavity and communicated with a cavity body of the negative pressure adsorption cavity. The negative pole piece is installed at the tail of the winding core, the working end face is in contact with the tail of the negative pole piece, namely the copper foil, and negative pressure is formed between the working end face and the copper foil under the action of the air extractor, so that the copper foil is flatly adsorbed, the flatness of the copper foil in the winding process is ensured, and the copper foil is prevented from being folded.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery core production, specifically relating to a tooling for improving copper foil folding. Background Technology

[0002] The closing structure of lithium-ion battery cores is divided into separator closing and copper foil closing. Copper foil closing not only helps to improve the energy density of the cell, but its good thermal conductivity and fast heat dissipation also help to improve the safety performance of the cell. However, because the negative electrode sheet is coated on one side, it is prone to lifting. In addition, due to the influence of the winding process of the winding machine, the lifting state of the negative electrode sheet at the baffle is inconsistent during core closing. The copper foil is prone to folding during core winding, which affects the safety performance and yield of the battery. Utility Model Content

[0003] To address the problem of copper foil easily folding during battery core winding, this utility model provides a tooling that improves the copper foil folding effect.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A fixture for improving copper foil folding includes a fixture body, which comprises a mounting plate and a negative pressure adsorption chamber. The mounting plate is connected to the side wall of the negative pressure adsorption chamber and has mounting holes and maintenance arc-shaped clearance holes. The end face of the negative pressure adsorption chamber that contacts the copper foil is the working end face, which has several adsorption holes communicating with the cavity of the negative pressure adsorption chamber. The side wall of the negative pressure adsorption chamber has an air extraction hole communicating with the cavity. An external air extraction device extracts air through the air extraction hole, creating a negative pressure at the working end face to adsorb the contacting copper foil. Furthermore, because the working end face is flat, it ensures the flatness of the copper foil during winding, preventing folding. The fixed mounting plate is used to install the tooling in the required position. A pin is installed in the inspection arc relief hole. When it is necessary to inspect and clean the negative pressure adsorption chamber, the entire tooling can be rotated around the pin within the range limited by the inspection arc relief hole, so that the tooling leaves the winding station and is convenient for inspection and cleaning.

[0006] In a preferred embodiment of this utility model, the negative pressure adsorption chamber has a groove on the opposite end face of the working end face, the adsorption hole penetrates the bottom wall of the groove, and the air extraction hole penetrates the side wall of the groove; a negative pressure sealing cover is installed at the opening of the groove, and the space enclosed by the negative pressure sealing cover and the inner wall of the groove is the chamber. The negative pressure sealing cover is manufactured separately, and the rest of the parts are integrally formed with the fixed mounting plate.

[0007] As a preferred embodiment of this utility model, a sealing cover assembly groove is provided on the end face opposite to the working end face of the negative pressure adsorption cavity. The bottom wall of the sealing cover assembly groove is connected to the groove. The bottom wall of the sealing cover assembly groove and the side wall of the groove form a step. The negative pressure sealing cover is placed in the sealing cover assembly groove, and the part of the negative pressure sealing cover in contact with the step is filled with sealant.

[0008] As a preferred embodiment of this utility model, the arc center angle of the inspection arc-shaped clearance hole is 90°.

[0009] As a preferred embodiment of this utility model, the center of the inspection arc-shaped clearance hole coincides with the center of the fixed mounting hole.

[0010] As a preferred embodiment of this utility model, the fixed mounting plate and the negative pressure adsorption cavity are integrally formed.

[0011] This invention is installed at the end of the winding core, with the working end face in contact with the end of the negative electrode sheet, i.e., the copper foil. Under the action of the air extraction device, a negative pressure is formed between the working end face and the copper foil, which flatly adsorbs the copper foil, ensuring the flatness of the copper foil during the winding process and preventing the copper foil from folding. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of this utility model, omitting the negative pressure sealing cover.

[0015] Figure 3 This is a cross-sectional view of the present invention, omitting the negative pressure sealing cover. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example:

[0018] A tooling for improving copper foil folding includes a tooling body, such as Figure 1 and 2 As shown, the tooling body includes a fixed mounting plate 1 and a negative pressure adsorption chamber 2. The fixed mounting plate 1 is provided with a fixed mounting hole 11 and a maintenance arc-shaped clearance hole 12; the arc center angle of the maintenance arc-shaped clearance hole 12 is 90°, and the center of the maintenance arc-shaped clearance hole 12 coincides with the center of the fixed mounting hole 11.

[0019] The fixed mounting plate is used to install the tooling in the required position through the fixed mounting hole 11. A pin is installed in the inspection arc relief hole. When it is necessary to inspect and clean the negative pressure adsorption chamber, the tooling can be rotated around the pin within the range limited by the inspection arc relief hole to move the tooling away from the winding station for easy inspection and cleaning.

[0020] like Figure 2 and 3 As shown, the end face of the negative pressure adsorption chamber 2 that contacts the copper foil is the working end face. The working end face has several adsorption holes 21. The negative pressure adsorption chamber 2 has a groove 23 and a sealing cap assembly groove 25 on the opposite end face of the working end face. The groove 23 is located on the bottom wall of the sealing cap assembly groove 25, meaning the size of the sealing cap assembly groove 25 is larger than the size of the groove 23. The bottom wall of the sealing cap assembly groove 25 communicates with the groove 23. The bottom wall of the sealing cap assembly groove 25 and the side wall of the groove 23 form a step. The negative pressure sealing cap 24 is placed in the sealing cap assembly groove, and the part of the negative pressure sealing cap 24 that contacts the step is filled with sealant. The space enclosed by the negative pressure sealing cap 24 and the inner wall of the groove 23 is the cavity. The adsorption hole is connected to the cavity. Specifically, the adsorption hole 21 penetrates the bottom wall of the groove 23. The air extraction hole 22 is set on the side wall of the negative pressure adsorption cavity 2. Specifically, the air extraction hole 22 penetrates the side wall of the groove. The external air extraction device extracts air from the air extraction hole, so that a negative pressure state is generated at the working end face to adsorb the copper foil in contact. Since the working end face is flat, it can ensure the flatness of the copper foil during the winding process and avoid the copper foil from folding.

[0021] In this embodiment, for ease of processing, the negative pressure sealing cover is manufactured separately, and the rest of the negative pressure adsorption cavity 2 is integrally formed with the fixed mounting plate, and the fixed mounting plate 1 is located on the side of the negative pressure adsorption cavity 2.

[0022] During use, the vacuum equipment draws air from the air extraction hole 22, groove 23 and adsorption hole 21, so that a negative pressure is formed between the working end face and the contact end face of the copper foil to flatten and adsorb the copper foil, so that the tail of the negative electrode sheet will not bend during the winding process of the core, thus solving the safety risk problem caused by abnormal copper foil bending, improving the pass rate of core winding, and reducing production costs.

[0023] A comparison of the improvement effect of copper foil folding before and after using the tooling of this utility model shows that the copper foil folding ratio is reduced by 0.03%, which can improve the safety performance of the battery cell.

[0024] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tooling for improving copper foil folding, characterized in that: The fixture body includes a fixed mounting plate (1) and a negative pressure adsorption chamber (2). The fixed mounting plate (1) is connected to the side wall of the negative pressure adsorption chamber (2). The fixed mounting plate (1) is provided with a fixed mounting hole (11) and a maintenance arc-shaped clearance hole (12). The end face of the negative pressure adsorption chamber (2) that contacts the copper foil is the working end face. The working end face is provided with a number of adsorption holes (21). The adsorption holes (21) are connected to the cavity of the negative pressure adsorption chamber (2). The side wall of the negative pressure adsorption chamber (2) is provided with an air extraction hole (22). The air extraction hole (22) is connected to the cavity of the negative pressure adsorption chamber (2).

2. The tooling for improving copper foil folding according to claim 1, characterized in that: The negative pressure adsorption chamber (2) has a groove (23) on the opposite end face of the working end face. The adsorption hole (21) penetrates the bottom wall of the groove (23) and the air extraction hole (22) penetrates the side wall of the groove. A negative pressure sealing cover (24) is installed at the opening of the groove (23). The space enclosed by the negative pressure sealing cover (24) and the inner wall of the groove (23) is the chamber.

3. The tooling for improving copper foil folding according to claim 2, characterized in that: A sealing cap assembly groove (25) is provided on the opposite end face of the working end face of the negative pressure adsorption chamber (2). The bottom wall of the sealing cap assembly groove (25) is connected to the groove (23). The bottom wall of the sealing cap assembly groove (25) and the side wall of the groove (23) form a step. The negative pressure sealing cap (24) is placed in the sealing cap assembly groove, and the part of the negative pressure sealing cap (24) that contacts the step is filled with sealant.

4. The tooling for improving copper foil folding according to any one of claims 1-3, characterized in that: The arc center angle of the inspection arc-shaped relief hole (12) is 90°.

5. The tooling for improving copper foil folding according to claim 4, characterized in that: The center of the inspection arc-shaped clearance hole (12) coincides with the center of the fixed mounting hole (11).

6. The tooling for improving copper foil folding according to claim 5, characterized in that: The fixed mounting plate (1) and the negative pressure adsorption chamber (2) are integrally formed.

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