Novel mylar film and assembly structure thereof

Abstract

The utility model provides a novel mylar membrane and an assembly structure thereof, and belongs to the technical field of batteries. The packaging film comprises an upper film and side films, the side films are arranged on the two sides of the upper film, at least one positioning through hole is formed in the upper film, a pole group can penetrate through the positioning through hole so that the upper film can be located between lower plastic and a smooth aluminum sheet, the upper ends of the side films are connected with the upper film, and the lower ends of the side films are provided with bottom limiting structures capable of being connected with the bottom of a battery cell. The mylar film is fixed between the bright aluminum sheet and the lower plastic, hot melting of the mylar film and the lower plastic is not needed, procedures are effectively reduced, and the cost is reduced; the problem of malposition of the mylar film caused by displacement in the pole group packaging process of the mylar film is avoided; and the battery cell processing efficiency and the battery cell processing first pass yield are effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries and relates to a novel mylar film and an assembly structure thereof. Background Art

[0002] Power batteries and energy storage batteries are the two major scenarios for the application of battery technology. The packaging types of power batteries are classified into three forms: cylindrical, square and soft pack. Intuitively, their differences are only in shape, but they also differ in technology development and application. Square batteries are more flexible and can be customized according to the specific needs of the products they carry, so they vary in size. At present, there is no clear standard division like cylindrical batteries in terms of manufacturing process or application standards.

[0003] For square batteries, before the bare cell is put into the shell, Mylar is used to wrap the bare cell in order to prevent the bare cell from contacting the aluminum shell and causing a short circuit. However, the mylar is fixed by hot melting with the lower plastic. During the hot melting process, because the thickness of the lower plastic is small and the thickness of the lower plastic is constantly decreasing, it becomes increasingly difficult for the mylar to melt during the hot melting process. In addition, if the mylar is misplaced during the electrode packing process, when the mylar is inserted between the shell and the cover, poor welding between the cover and the shell occurs during the peripheral welding process, resulting in leakage. Utility Model Content

[0004] The purpose of the utility model is to provide a new type of mylar film in view of the above problems.

[0005] Another object of the utility model is to provide a novel mylar film assembly structure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A new type of mylar film includes an upper film and a side film. The side films are arranged on both sides of the upper film. The upper film is provided with at least one positioning through hole for the electrode group to pass through so that the upper film is located between the lower plastic and the bare aluminum sheet. The upper end of the side film is connected to the upper film, and a bottom limiting structure that can be connected to the bottom of the battery cell is provided at the lower end of the side film.

[0008] The upper film is positioned and fixed between the lower plastic and the bare aluminum sheet through the positioning through holes. There is no need for hot melting with the lower plastic, which can effectively reduce the number of processes and costs, improve the efficiency of the battery cell manufacturing process and the straight-through rate of the battery cell manufacturing process. The bottom limiting structure at the lower end of the side film can prevent the displacement of the side film from being misaligned, resulting in poor welding of the cover plate and the shell during the peripheral welding process when the mylar film is inserted between the shell and the cover plate, resulting in leakage.

[0009] In the above-mentioned novel mylar film, the bottom limiting structure includes at least one bottom film arranged at the lower end of the side film.

[0010] At least one bottom film is provided at the lower end of the side film. When the two side films are respectively covered on the two sides of the electrode group, the bottom films at the lower ends of the two side films overlap to raise the electrode group. The abutment contact between the bottom film and the bottom of the battery cell can prevent the displacement of the side film.

[0011] In the above-mentioned novel mylar film, the bottom film has two pieces which are connected end to end and can be overlapped, and one of the bottom films is connected to the side film.

[0012] When the two side films are respectively coated on the two sides of the electrode group, the bottom films at the lower ends of the two side films are folded and overlapped to raise the electrode group. The abutment contact between the bottom film and the bottom of the battery cell can prevent the displacement of the side films.

[0013] In the above-mentioned novel mylar film, side surrounding films are respectively provided on both sides of the side film.

[0014] The side surrounding films on both sides of the side film are used to cover the side of the electrode group.

[0015] In the above-mentioned novel mylar film, the width of the side surrounding films on both sides of one side film is smaller than the width of the side surrounding films on both sides of the other side film.

[0016] The width of the side surrounding films on both sides of one side film is smaller than the width of the side surrounding films on both sides of another side film, so as to facilitate the overlapped and fixed connection between the side surrounding films on both sides of the two side films.

[0017] In the above-mentioned novel mylar film, the upper film, the side film, the bottom film and the side surrounding film are all rectangular, and the two outer corners of the side surrounding film are both chamfered.

[0018] The upper film, side film, bottom film and side surrounding film are all rectangular in shape to adapt to the shape of the battery cell, and the chamfers on the outer corners of the side surrounding film can prevent interference between the outer corners of the side surrounding film and the upper film and the bottom film.

[0019] In the above-mentioned novel mylar film, the side surrounding film and the side film are connected through the first folded angle film.

[0020] The provision of the first folded corner film facilitates the folding between the side surrounding films and the side films.

[0021] In the above-mentioned novel mylar film, the upper film and the side film are connected through the second folded angle film.

[0022] The provision of the second folded angle film facilitates the folding between the upper film and the side film.

[0023] In the above-mentioned novel mylar film, the bottom film and the side film are connected through the third folded corner film; and the two bottom films are connected through the fourth folded corner film.

[0024] The third folding angle film is provided to facilitate the folding between the base film and the side film, and the fourth folding angle film is provided to facilitate the folding between the base films.

[0025] A novel mylar film assembly structure comprises a novel mylar film, wherein a plain aluminum sheet and a lower plastic are respectively arranged on the upper and lower surfaces of the upper film, an electrode group is passed through a positioning through hole, the plain aluminum sheet and the lower plastic clamp the side edge of the upper film, a side film is coated on the side surface of the electrode group, and a bottom limiting structure is arranged at the bottom of the side film to prevent the side film from displacement.

[0026] The electrode group is passed through the positioning through hole, and the bare aluminum sheet and the lower plastic clamp the side edge of the upper membrane. The upper membrane does not need to be hot-melted with the lower plastic, which can effectively reduce the process and reduce costs, improve the efficiency of the battery cell process and the straight-through rate of the battery cell process, and the bottom limiting structure at the bottom of the side membrane can prevent the side membrane from being displaced.

[0027] Compared with the existing technology, the advantages of the utility model are: 1. The mylar film is fixed between the bare aluminum sheet and the lower plastic, and there is no need to heat-melt the mylar film and the lower plastic, which effectively reduces the process and reduces the cost. 2. The mylar film will not shift during the electrode assembly process, resulting in the problem of mylar film misalignment. 3. Effectively improve the efficiency of the battery cell process and the battery cell process pass rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure provided by the utility model;

[0029] Figure 2 It is a side view provided by the utility model;

[0030] Figure 3 This is a schematic diagram of the structure when the mylar film is not coated;

[0031] Figure 4 It is a top view of the mylar membrane;

[0032] Figure 5 This is the front view of the battery cell when the mylar film is wrapped;

[0033] Figure 6 This is the side view of the battery cell when the mylar film is wrapped;

[0034] In the figure, upper film 1, side film 2, electrode group 3, lower plastic 4, plain aluminum sheet 5, bottom limiting structure 6, positioning through hole 7, bottom film 8, side surrounding film 9, chamfer 10, first folded corner film 11, second folded corner film 12, third folded corner film 13, fourth folded corner film 14. DETAILED DESCRIPTION

[0035] like Figure 1-Figure 6As shown, a new type of mylar film includes an upper film 1 and a side film 2, the side films 2 are arranged on both sides of the upper film 1, the upper film 1 is provided with at least one positioning through hole 7 for the electrode group 3 to pass through so that the upper film 1 is located between the lower plastic 4 and the bare aluminum sheet 5, the upper end of the side film 2 is connected to the upper film 1, and the lower end of the side film 2 is provided with a bottom limiting structure 6 that can be connected to the bottom of the battery cell.

[0036] In the present invention, at least one positioning through hole 7 is provided on the upper film 1 for the electrode group 3 to pass through so that the upper film 1 is positioned and fixed between the lower plastic 4 and the aluminum sheet 5 .

[0037] The upper film 1 is positioned and fixed between the lower plastic 4 and the bare aluminum sheet 5 through the positioning through hole 7. There is no need for hot melting with the lower plastic 4, which can effectively reduce the number of processes and costs, improve the efficiency of the battery cell process and the straight-through rate of the battery cell process. The bottom limiting structure 6 at the lower end of the side film 2 can prevent the displacement of the side film 2 and misalignment, which causes the mylar film to be inserted between the shell and the cover plate, resulting in poor welding between the cover plate and the shell during the peripheral welding process, resulting in leakage.

[0038] Specifically, combined with Figure 1-Figure 6 As shown, the bottom limiting structure 6 includes at least one bottom film 8 arranged at the lower end of the side film 2.

[0039] At least one bottom film 8 is provided at the lower end of the side film 2. When the two side films 2 are respectively covered on the two side surfaces of the electrode group 3, the bottom films 8 at the lower ends of the two side films 2 overlap to raise the electrode group 3. The abutment contact between the bottom film 8 and the bottom of the battery cell can prevent the side film 2 from being displaced.

[0040] Specifically, combined with Figure 1-Figure 3 As shown, the bottom film 8 has two pieces which are connected end to end and can be overlapped, and one of the bottom films 8 is connected to the side film 2 .

[0041] When the two side membranes 2 are respectively covered on the two sides of the electrode group 3, the bottom membrane 8 at the lower ends of the two side membranes 2 are folded and overlapped to raise the electrode group 3. The contact between the bottom membrane 8 and the bottom of the battery cell can prevent the side membrane 2 from shifting and misaligning.

[0042] Specifically, combined with Figure 1 , Figure 3 and Figure 4 As shown, side surrounding films 9 are respectively provided on both sides of the side film 2.

[0043] The side surrounding films 9 on both sides of the side films are used to cover the side of the electrode group 3 .

[0044] Preferably, combined Figure 4 As shown, the width of the side surrounding films 9 on both sides of one side film 2 is smaller than the width of the side surrounding films 9 on both sides of the other side film 2 .

[0045] The width of the side surrounding films 9 on both sides of one side film 2 is smaller than the width of the side surrounding films 9 on both sides of another side film 2 , so as to facilitate the overlapped and fixed connection between the side surrounding films 9 on both sides of the two side films 2 .

[0046] Specifically, combined with Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, the upper film 1 , the side film 2 , the bottom film 8 and the side surrounding film 9 are all rectangular in shape, and the two outer corners of the side surrounding film 9 are both chamfered 10 .

[0047] The upper film 1 , the side film 2 , the bottom film 8 and the side surrounding film 9 are all rectangular in shape to adapt to the shape of the battery cell. The chamfers 10 on the outer corners of the side surrounding film 9 can prevent interference between the outer corners of the side surrounding film 9 and the upper film 1 and the bottom film 8 .

[0048] Preferably, combined Figure 1 , Figure 3 and Figure 4 As shown, the side surrounding film 9 is connected to the side film 2 via a first folded angle film 11 .

[0049] The provision of the first angled film 11 facilitates the folding between the side surrounding film 9 and the side film 2 .

[0050] Preferably, combined Figure 1 , Figure 3 and Figure 4 As shown, the upper film 1 and the side film 2 are connected via the second folded angle film 12 .

[0051] The provision of the second angled film 12 facilitates the folding between the upper film 1 and the side film 2 .

[0052] Preferably, combined Figure 1 , Figure 3 and Figure 4 As shown, the bottom film 8 and the side film 2 are connected via the third folded angle film 13 ; the two bottom films 8 are connected via the fourth folded angle film 14 .

[0053] The third folding angle film 13 is provided to facilitate the folding between the base film 8 and the side film 2 , and the fourth folding angle film 14 is provided to facilitate the folding between the base films 8 .

[0054] like Figure 1-Figure 6 As shown, a new type of mylar film assembly structure includes a new type of mylar film, a plain aluminum sheet 5 and a lower plastic 4 are respectively provided on the upper and lower surfaces of the upper film 1, an electrode group 3 is penetrated through a positioning through hole 7, the plain aluminum sheet 5 and the lower plastic 4 clamp the side edge of the upper film 1, a side film 2 is coated on the side surface of the electrode group 3, and a bottom limiting structure 6 is provided at the bottom of the side film 2 to prevent the side film 2 from displacement.

[0055] The electrode group 3 is passed through the positioning through hole 7, and the bare aluminum sheet 5 and the lower plastic 4 clamp and fix the side edge of the upper film 1. The upper film 1 does not need to be hot-melted with the lower plastic 4, which can effectively reduce the process steps and reduce costs, improve the efficiency of the battery cell process and the battery cell process pass rate, and the bottom limiting structure 6 at the bottom of the side film 2 can prevent the side film 2 from being displaced and misaligned.

[0056] The working principle of the utility model is: at least one positioning through hole 7 is provided on the upper film 1 for the electrode group 3 to pass through so that the upper film 1 is positioned and fixed between the lower plastic 4 and the light aluminum sheet 5, and the light aluminum sheet 5 and the lower plastic 4 clamp and fix the side edge of the upper film 1;

[0057] The upper film 1 is positioned and fixed between the lower plastic 4 and the light aluminum sheet 5 through the positioning through hole 7, and does not need to be hot-melted with the lower plastic 4, which can effectively reduce the process and cost, improve the efficiency of the battery cell process and the straight-through rate of the battery cell process, and the bottom limiting structure 6 at the lower end of the side film 2 can prevent the displacement of the side film 2 from causing misalignment, which causes the cover plate and the shell to be poorly welded during the peripheral welding process when the mylar film is inserted between the shell and the cover plate, resulting in leakage;

[0058] When the two side films 2 are respectively coated on the two sides of the electrode group 3, the bottom films 8 at the lower ends of the two side films 2 are folded and overlapped to raise the electrode group 3, and the contact between the bottom film 8 and the bottom of the battery cell can prevent the displacement of the side films 2; the side surrounding films 9 on both sides of the side films are used to cover the side of the electrode group 3;

[0059] The width of the side surrounding films 9 on both sides of one side film 2 is smaller than the width of the side surrounding films 9 on both sides of another side film 2, so as to facilitate the overlap and fixed connection between the side surrounding films 9 on both sides of the two side films 2;

[0060] The upper film 1, the side film 2, the bottom film 8 and the side surrounding film 9 are all rectangular in shape to adapt to the shape of the battery cell, and the chamfer 10 on the outer corner of the side surrounding film 9 can prevent the outer corner of the side surrounding film 9 from interfering with the upper film 1 and the bottom film 8;

[0061] The first angle folding film 11 is arranged to facilitate the folding between the side surrounding film 9 and the side film 2; the second angle folding film 12 is arranged to facilitate the folding between the upper film 1 and the side film 2; the third angle folding film 13 is arranged to facilitate the folding between the bottom film 8 and the side film 2; and the fourth angle folding film 14 is arranged to facilitate the folding between the bottom films 8.

[0062] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0063] Although this article uses the upper film 1, side film 2, electrode group 3, lower plastic 4, plain aluminum sheet 5, bottom limiting structure 6, positioning through hole 7, bottom film 8, side surrounding film 9, chamfer 10, first folded corner film 11, second folded corner film 12, third folded corner film 13, fourth folded corner film 14, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A novel mylar film, comprising an upper film (1) and side films (2), wherein the side films (2) are arranged on both sides of the upper film (1), characterized in that: The upper membrane (1) is provided with at least one positioning through hole (7) through which the electrode group (3) can pass so that the upper membrane (1) is located between the lower plastic (4) and the bare aluminum sheet (5); the upper end of the side membrane (2) is connected to the upper membrane (1); and the lower end of the side membrane (2) is provided with a bottom limiting structure (6) that can be connected to the bottom of the battery cell.

2. The novel mylar film according to claim 1, characterized in that: The bottom limiting structure (6) comprises at least one bottom film (8) arranged at the lower end of the side film (2).

3. The novel mylar film according to claim 2, characterized in that: The bottom film (8) has two pieces which are connected end to end and can be overlapped, and one of the bottom films (8) is connected to the side film (2).

4. The novel mylar film according to any one of claims 1 to 3, characterized in that: Side surrounding films (9) are respectively provided on both sides of the side film (2).

5. The novel mylar film according to claim 4, characterized in that: The width of the side surrounding films (9) on both sides of one side film (2) is smaller than the width of the side surrounding films (9) on both sides of the other side film (2).

6. The novel mylar film according to claim 4, characterized in that: The upper film (1), the side film (2), the bottom film (8) and the side surrounding film (9) are all rectangular in shape, and the two outer corners of the side surrounding film (9) are both chamfered (10).

7. The novel mylar film according to claim 4, characterized in that: The side surrounding film (9) is connected to the side film (2) via a first folded angle film (11).

8. The novel mylar film according to any one of claims 1 to 3, characterized in that: The upper film (1) and the side film (2) are connected via a second folded angle film (12).

9. The novel mylar film according to claim 2 or 3, characterized in that: The base film (8) and the side film (2) are connected via a third folded angle film (13); the two base films (8) are connected via a fourth folded angle film (14).

10. A new type of mylar film assembly structure, characterized in that: It comprises the new type of mylar film as described in any one of claims 1 to 9, wherein a plain aluminum sheet (5) and a lower plastic (4) are respectively provided on the upper and lower surfaces of the upper film (1), the electrode group (3) is penetrated through the positioning through hole (7), the plain aluminum sheet (5) and the lower plastic (4) clamp the side edge of the upper film (1), the side film (2) is coated on the side of the electrode group (3), and a bottom limiting structure (6) is provided at the bottom of the side film (2) to prevent the side film (2) from displacement.

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