Mylar membrane structure of sodium ion battery

Abstract

The utility model provides a sodium ion battery Mylar membrane structure which comprises a Mylar membrane box body used for containing a battery cell, the upper side, the lower side, the left side and the right side of a top opening of the Mylar membrane box body are respectively provided with a large side face and a small side face, folding parts are arranged on the two sides of the large side face, self-locking buckles are arranged on the folding parts, and the self-locking buckles are connected with the large side face and the small side face. A self-locking hole correspondingly matched with the self-locking buckle is formed in the side face of the small face. The battery cell can be directly sleeved into the Mylar diaphragm capsule body through the opening in the top of the Mylar diaphragm capsule body, and then is closed in a manner that the large-surface side surface and the small-surface side surface at the top are matched with the self-locking buckle and the self-locking hole; according to the invention, the action of folding the Mylar film by a mechanical clamp is removed, so that the battery cell can be prevented from being damaged when the Mylar film is folded, the adhesive tape sticking action and the adhesive sticking action are omitted, the cost is reduced, and the production efficiency of wrapping the Mylar film is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium ion battery production, in particular to a Mylar film structure of a sodium ion battery. Background Art

[0002] During the production process of sodium battery square aluminum shell batteries, the battery cells need to be wrapped with Mylar film before being put into the shell to prevent the battery cells from contacting the aluminum shell and affecting the battery quality.

[0003] The Mylar film is a flat structure. During the coating process, it needs to be folded by a mechanical clamp. This will inevitably cause powder loss and electrode damage at the bottom of the battery cell due to scratches when the Mylar film is folded. After the Mylar film is folded to wrap the battery cell, it is necessary to fix the Mylar film by gluing the bottom and sides of the battery cell to prevent it from rebounding. This process is time-consuming and labor-intensive. Utility Model Content

[0004] In order to solve the above problems, the utility model aims to propose a Mylar membrane structure for sodium ion batteries, a Mylar membrane box body for accommodating battery cells, a Mylar membrane box body structure with battery cell insertion and top lock, which can avoid damage to the battery cell when the Mylar is folded and reduce the bottom glue sticking action.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A Mylar membrane structure for a sodium ion battery comprises a Mylar membrane box body for accommodating a battery cell, wherein the upper and lower sides, left and right sides of the top opening of the Mylar membrane box body are respectively provided with a large surface side and a small surface side, folding portions are provided on both sides of the large surface side, self-locking buckles are provided on the folding portions, and self-locking holes corresponding to the self-locking buckles are provided on the small surface side.

[0007] Furthermore, the thickness of the Mylar film box body is: 0.1 mm ≤ film thickness ≤ 0.4 mm, the width of the folded portion is: 12 mm ≤ width ≤ 15 mm, 0.1 mm ≤ thickness ≤ 0.6 mm.

[0008] Furthermore, the bottom closed area of ​​the Mylar film box body has a width dimension of 50±5 mm.

[0009] Furthermore, the bottom closed area of ​​the Mylar film box body is a thickened porous structure.

[0010] Furthermore, the thickness of the bottom closed area of ​​the Mylar film box body is: 0.7 mm≤thickness≤0.9 mm.

[0011] Furthermore, the size of a single through hole of the thickened porous structure in the bottom closed area of ​​the Mylar film box body is 0.4±0.1 mm, and the total area of ​​the through holes accounts for 5%-10% of the area of ​​the bottom closed area.

[0012] Beneficial effects: The battery cell of the utility model can be directly inserted into the Mylar film box body through the top opening of the Mylar film box body, and then closed by means of the large side surface and the small side surface of the top in cooperation with the self-locking buckle and the self-locking hole; the action of folding the Mylar film by the mechanical clamp is eliminated, which can avoid damage to the battery cell when the Mylar is folded, and the adhesive tape and the action of gluing are omitted, thereby reducing the cost and improving the production efficiency of Mylar film packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0014] Figure 1 The three-dimensional structure of the Mylar membrane structure of the sodium ion battery described in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0015] Figure 2 The three-dimensional structure of the Mylar membrane structure of the sodium ion battery described in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0016] Figure 3 This is a schematic diagram of the unfolded dimensions of the Mylar membrane structure of a sodium ion battery according to an embodiment of the utility model;

[0017] Figure 4 This is a dimensional diagram of the bottom closed area of ​​the Mylar membrane box body of the Mylar membrane structure for the sodium ion battery described in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] Example 1

[0020] See also Figure 1-4A Mylar membrane structure for a sodium ion battery comprises a Mylar membrane box body 1 for accommodating a battery cell, wherein the upper, lower, left and right sides of the top opening of the Mylar membrane box body 1 are respectively provided with a large surface side surface 11 and a small surface side surface 12, wherein both sides of the large surface side surface 11 are provided with a folding portion 111, wherein the folding portion 111 is provided with a self-locking buckle 1111, and the small surface side surface 12 is provided with a self-locking hole 121 corresponding to and matching the self-locking buckle 1111.

[0021] The battery cell of the present embodiment can be directly inserted into the Mylar film box body through the top opening of the Mylar film box body, and then closed by means of the self-locking buckles and self-locking holes in the large and small side surfaces of the top; eliminating the action of folding the Mylar film with a mechanical clamp can avoid damage to the battery cell when Mylar is folded, eliminating the need for adhesive tape and adhesive action, reducing costs, and improving the production efficiency of Mylar film packaging.

[0022] It should be noted that the lower half of the Mylar film in this embodiment is a Mylar film box body that is integrally formed with an opening on the top; the upper half extends from the lower half, and includes a small side face and a large side face that are relatively arranged. A crease is provided at the connection between the upper and lower parts, and a folding portion is extended from the large side face for overlapping the small side face after folding. Located in the folding area, matching self-locking holes and self-locking buckles are provided on both sides to achieve the closure of the upper half of the Mylar film. When the battery cell is wrapped with the film, the upper half of the Mylar film is opened, and the battery cell enters from this opening. After the battery cell is fully entered, the upper half is closed.

[0023] In a specific example, the thickness of the Mylar film box body 1 is: 0.1 mm ≤ film thickness ≤ 0.4 mm, the width of the folded portion 111 is: 12 mm ≤ width ≤ 15 mm, 0.1 mm ≤ thickness ≤ 0.6 mm.

[0024] The above-mentioned size design of this embodiment can not only ensure the closing effect of the Mylar film, but also avoid the waste of materials; the consideration of the thickness of the folding part, that is, to ensure the structural strength of the folding area and avoid the thickness of the folding area being too large, which affects the coating effect. The selection of the above specific parameters needs to consider the size of the aluminum shell and the difficulty of the battery cell entering the shell.

[0025] In a specific example, the width dimension of the bottom closed area of ​​the Mylar film box body 1 is 50±5 mm.

[0026] When the battery cell enters the Mylar film, it needs to be positioned and calibrated first. After calibration, the bottom of the battery cell slowly enters the closed area at the bottom of the Mylar film. Entering too quickly may cause the Mylar film to be soft, easy to deform, wrinkle and break, and powder falling off at the bottom of the battery cell. If the bottom closing width is too small, the battery cell will take a long time to enter the film and the risk of quality problems will be high, affecting the coating efficiency. If the closed area width is too large, it will affect the closing effect of the self-locking holes and self-locking buckles in the upper half, resulting in ineffective coating of some areas.

[0027] In a specific example, the bottom closed area of ​​the Mylar film box body 1 is a thickened porous structure 13 .

[0028] The bottom of the Mylar film box body of this embodiment is a thickened porous structure, and the thickened part replaces the gasket at the bottom of the battery cell, eliminating the need to install a gasket during the film coating process.

[0029] In a specific example, the thickness of the bottom closed area of ​​the Mylar film box body 1 is: 0.7 mm≤thickness≤0.9 mm.

[0030] The thickened portion of the bottom closed area of ​​the Mylar film box body of this embodiment serves to protect the bottom of the battery cell. If it is too thick, it will affect the battery space utilization.

[0031] In a specific example, the size of a single through hole of the thickened porous structure 13 in the bottom closed area of ​​the Mylar film box body 1 is 0.4±0.1 mm, and the total area of ​​the through holes accounts for 5%-10% of the area of ​​the bottom closed area.

[0032] The size of a single through hole in this embodiment is 0.4±0.1 mm, and the total area of ​​the through holes accounts for 5%-10% of the area of ​​the bottom Mylar film. If the opening area is too large, the isolation protection of the bottom thickened part will fail, and the risk of contact between the battery cell and the aluminum shell is high; if the opening area is too small, the electrolyte infiltration effect of the battery cell will be affected.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sodium ion battery Mylar film structure, characterized in that: The Mylar film box body (1) comprises a Mylar film box body (1) for accommodating an electric core, wherein the upper and lower sides and the left and right sides of the top opening of the Mylar film box body (1) are respectively provided with a large surface side surface (11) and a small surface side surface (12), and both sides of the large surface side surface (11) are provided with a folding portion (111), and the folding portion (111) is provided with a self-locking buckle (1111), and the small surface side surface (12) is provided with a self-locking hole (121) corresponding to and matching the self-locking buckle (1111).

2. The sodium ion battery Mylar film structure according to claim 1, characterized in that: The thickness of the Mylar film box body (1) is: 0.1 mm ≤ film thickness ≤ 0.4 mm, the width of the folded portion (111) is: 12 mm ≤ width ≤ 15 mm, 0.1 mm ≤ thickness ≤ 0.6 mm.

3. The Mylar membrane structure of a sodium ion battery according to claim 1, characterized in that: The width dimension of the bottom closed area of ​​the Mylar film box body (1) is 50±5 mm.

4. The Mylar membrane structure of a sodium ion battery according to claim 1, characterized in that: The bottom closed area of ​​the Mylar film box body (1) is a thickened porous structure (13).

5. The Mylar film structure of a sodium ion battery according to claim 4, characterized in that: The thickness of the bottom closed area of ​​the Mylar film box body (1) is: 0.7 mm ≤ thickness ≤ 0.9 mm.

6. The Mylar film structure of a sodium ion battery according to claim 4, characterized in that: The size of a single through hole of the thickened porous structure (13) in the bottom closed area of ​​the Mylar film box body (1) is 0.4±0.1 mm, and the total area of ​​the through holes accounts for 5%-10% of the area of ​​the bottom closed area.

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