Lithium battery protective film

Abstract

The utility model discloses a lithium battery protective film which comprises a rectangular bottom film, two first side films, a plurality of second side films and a reinforcing film, the two first side edge films are symmetrically arranged on the two sides of the rectangular bottom film along the two long edges of the rectangular bottom film. Each second side edge film is arranged on the two sides of the first side edge film along the short edge of the first side edge film; the second side edge films arranged on the same side of the two first side edge films can be folded and overlapped; the reinforcing film is arranged on the edge of the long side of the first side film, and the reinforcing film can be folded towards the direction of the first side film to be overlapped with the first side film and form a reinforcing structure through welding; wherein the rectangular bottom film, the first side film, the second side film and the reinforcing film are integrally formed. According to the lithium battery protective film, the tearing strength can be improved by arranging the reinforcing film and the second side films which can be overlapped with each other.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy battery technical field, specifically about a lithium battery protection film. BACKGROUND

[0002] With the development of new energy vehicles, the use of lithium batteries is gradually widespread. The performance of lithium batteries also gets more attention. Especially the safety of lithium batteries is more and more valued and concerned. In the use process of lithium battery, the surface of lithium battery is covered with insulating protective film to avoid short circuit between adjacent lithium batteries. And due to the limitation of installation space, the insulating protective film is generally a light protective film. The traditional planar light insulating film has the problem of insufficient tear resistance under the premise of lightness. Especially the edge of the insulating film is easy to wear, which causes the short circuit problem of lithium battery, greatly reduces the service life of lithium battery.

[0003] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the utility model and should not be regarded as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0004] The utility model aims at providing a lithium battery protection film which can improve the mechanical strength of the lithium battery protection film, avoid waste of materials and take into account the lightness of the protective film.

[0005] In order to achieve the above-mentioned purpose, the technical scheme provided by a specific embodiment of the utility model is as follows: a lithium battery protection film, comprising: a rectangular bottom film, two first side edge films, a plurality of second side edge films and a reinforcing film. Two first side edge films are symmetrically arranged on both sides of the rectangular bottom film along two long edges of the rectangular bottom film; each second side edge film is arranged on both sides of the first side edge film along the short edge of each first side edge film; the second side edge films arranged on the same side of the two first side edge films can be folded and overlapped; the reinforcing film is arranged on the long edge of the first side edge film, and the reinforcing film can be folded towards the first side edge film and overlapped with the first side edge film to form a reinforcing structure by welding; wherein the rectangular bottom film, the first side edge film, the second side edge film and the reinforcing film are integrally formed.

[0006] In one or more embodiments of the utility model, the length of the reinforcing film is equal to the length of the first side edge film, and the width of the reinforcing film is less than the width of the first side edge film; the width of the reinforcing film is between 2mm-5mm.

[0007] In one or more embodiments of the utility model, the connecting part of the first side edge film and the reinforcing film is provided with a rectangular hollow part along the long edge direction thereof; the rectangular hollow part is symmetrically arranged on the first side edge film and the reinforcing film.

[0008] In one or more embodiments of the utility model, the connecting part of the first side edge film and the reinforcing film is provided with a plurality of micropores along the long edge direction of the first side edge film, and the plurality of micropores are sequentially arranged to form a first folding line; the connecting part of the first side edge film and the rectangular bottom film is provided with a plurality of micropores along the long edge direction of the first side edge film, and the plurality of micropores are sequentially arranged to form a second folding line.

[0009] In one or more embodiments of the utility model, the connecting part of the first side edge film and the second side edge film is provided with a plurality of micropores along the short edge direction of the first side edge film, and the plurality of micropores are sequentially arranged to form a third folding line.

[0010] In one or more embodiments of the utility model, the connecting part of the first side edge film and the second side edge film is provided with two parallel third folding lines along the short edge direction of the first side edge film; the two third folding lines have a gap therebetween.

[0011] In one or more embodiments of the utility model, the distance of the gap is between 0.5mm and 1mm.

[0012] In one or more embodiments of the utility model, the end angle of the rectangular bottom film connected with the first side edge film is an arc-shaped angle.

[0013] In one or more embodiments of the utility model, both ends of the rectangular bottom film along the length direction thereof are provided with positioning holes, and the shapes of the two positioning holes are different.

[0014] In one or more embodiments of the utility model, the thickness of the rectangular bottom film, the first side edge film, the second side edge film and the reinforcing film is between 0.1mm and 0.3mm.

[0015] Compared with the prior art, the lithium battery protection film of the utility model can increase the thickness and tear resistance of the edge part of the protection film by arranging the reinforcing film and the second side edge film which can overlap each other; the folding line is easier to fold, and is suitable for automatic production. The rectangular bottom film, the first side edge film, the second side edge film and the reinforcing film are integrally formed, do not need additional design in the production process, can fully utilize the structure of the raw material, can realize the improvement of the mechanical strength of the lithium battery protection film without additional reinforcing parts, avoid the waste of materials and can also consider the lightness and thinness of the protection film. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to make the technical personnel in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person of ordinary skill in the art without creative labor should belong to the protection scope of the present application.

[0017] Figure 1 Figure is a schematic diagram of the lithium battery protection film in an embodiment of the present application;

[0018] Figure 2 Figure is a schematic diagram of the reinforcing film and the first side film after folding and welding in the lithium battery protection film in an embodiment of the present application.

[0019] Main figure mark explanation:

[0020] 1-rectangular bottom film, 2-first side film, 3-second side film, 4-reinforcing film, 41-rectangular hollow part, 42-rectangular notch, 5-reinforcing structure, 6-micropore, 61-first folding line, 62-second folding line, 63-third folding line, 631-gap, 7-arc-shaped corner, 8-positioning hole. Specific implementation

[0021] In order to make the technical personnel in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person of ordinary skill in the art without creative labor should belong to the protection scope of the present application.

[0022] As Figures 1-2 shown, the lithium battery protection film in an embodiment of the present application includes a rectangular bottom film 1, two first side films 2, a plurality of second side films 3 and a reinforcing film 4. The two first side films 2 are symmetrically arranged on both sides of the rectangular bottom film 1 along two long edges of the rectangular bottom film 1, and each first side film 2 is also approximately rectangular. Each second side film 3 is arranged on both sides of the first side film 2 along each short edge of the first side film 2. The second side films 3 arranged on the same side of the two first side films 2 can be folded and arranged in overlap. The reinforcing film 4 is arranged at the long edge of the first side film 2. The reinforcing film 4 can be folded in the direction of the first side film 2 to overlap the first side film 2 and form a reinforcing structure 5 through welding. Wherein, the rectangular bottom film 1, the first side film 2, the second side film 3 and the reinforcing film 4 are integrally formed.

[0023] In the above embodiment, when the lithium battery protective film is used, the first side film 2 is folded approximately 90° towards the rectangular base film 1; the second side film 3 is folded approximately 90° towards the first side film 2. The second side films 3 on the two symmetrically arranged first side films 2 overlap each other and are welded together to form a rectangular structure. This rectangular structure has an opening on one side where the reinforcing film 4 is provided, and there is an accommodating space in the middle of the rectangular structure for placing the lithium battery. Before using the lithium battery protective film, the reinforcing film 4 needs to be folded so that it overlaps with the edge of the first side film 2, and then welded together to form a reinforcing structure 5. Because the material at the opening of the rectangular structure formed by the lithium battery protective film is relatively thin, the mechanical strength at the opening can be improved by providing the reinforcing film 4, avoiding wear at the edge of the lithium battery protective film.

[0024] This lithium battery protective film, by incorporating a reinforcing film 4 and overlapping second side films 3, increases the thickness and tear resistance of the film's edges. The rectangular base film 1, first side films 2, second side films 3, and reinforcing film 4 are integrally molded, requiring no additional design during production and fully utilizing the structure of the raw materials. This achieves improved mechanical strength of the lithium battery protective film without the need for additional reinforcing components, thus avoiding material waste.

[0025] In one embodiment, the length of the reinforcing film 4 is equal to the length of the first side film 2, and the width of the reinforcing film 4 is smaller than the width of the first side film 2. Preferably, the width of the reinforcing film 4 is between 2mm and 5mm. The width of the reinforcing film 4 should not be too large, as an excessively large width would result in too much overlap between it and the first side film 2, leading to a significant increase in the range and thickness of the welded reinforcing structure 5, which would not meet the requirements for the thinness of the lithium battery protective film. In particular, when multiple lithium batteries are arranged closely together, obvious bulges are generated, which is not conducive to the close arrangement of lithium batteries.

[0026] The first side membrane 2 and the reinforcing membrane 4 are provided with rectangular cutouts 41 spaced apart along their long sides. For example, the rectangular cutouts 41 are symmetrically arranged on the first side membrane 2 and the reinforcing membrane 4. Figure 2 As shown, the fold line formed when the reinforcing film 4 is folded toward the first side film 2 can be the straight line containing the axis of symmetry of the rectangular cutout portion 41. When the reinforcing film 4 is folded toward the first side film 2, the rectangular cutout portion 41 located on the first side film 2 and the reinforcing film 4 overlaps, forming a rectangular notch 42. This rectangular notch 42 can be used to match the structural shape of the lithium battery itself, so that the lithium battery protective film fits more closely to the surface of the lithium battery.

[0027] Further, in order to facilitate the folding of the rectangular base film 1, the first side film 2, the second side film 3 and the reinforcing film 4 and ensure that the rectangular structure formed after folding of each lithium battery protection film is consistent, a plurality of micro-holes 6 are provided at the connecting part of the first side film 2 and the reinforcing film 4 along the long side direction of the first side film 2, and the plurality of micro-holes 6 are arranged in sequence to form a first folding line 61. A plurality of micro-holes 6 are provided at the connecting part of the first side film 2 and the rectangular base film 1 along the long side direction of the first side film 2, and the plurality of micro-holes 6 are arranged in sequence to form a second folding line 62. A plurality of micro-holes 6 are provided at the connecting part of the first side film 2 and the second side film 3 along the short side direction of the first side film 2, and the plurality of micro-holes 6 are arranged in sequence to form a third folding line 63.

[0028] The provision of the first folding line 61, the second folding line 62 and the third folding line 63 can make the folding of the rectangular base film 1, the first side film 2, the second side film 3 and the reinforcing film 4 easier. In particular, in automated production, the efficiency of production can be improved and the consistency of the structure obtained after folding can be ensured, thereby ensuring the accuracy of mass production.

[0029] Further, since the lithium battery protection film is close to the surface of the lithium battery when in use, in order to improve the adhesion of the lithium battery protection film to the lithium battery, two parallel third folding lines 63 are provided at the connecting part of the first side film 2 and the second side film 3 along the width direction of the first side film 2. The two third folding lines 63 have a gap 631 therebetween. Preferably, the distance of the gap 631 is between 0.5mm and 1mm, so as to adapt to the curvature of the edge of the lithium battery, thereby achieving better protection effect.

[0030] In an embodiment, the end angle of the rectangular base film 1 connected to the first side film 2 is an arc-shaped angle 7. The arc-shaped angle 7 makes the end part of the connecting part of the rectangular base film 1 and the first side film 2 not connected, thereby providing a certain avoiding space for folding of the first side film 2 and the rectangular base film 1, and making the folding easier.

[0031] In an embodiment, the rectangular base film 1 is provided with a positioning hole 8 at each end along the length direction thereof, and the shapes of the two positioning holes 8 are different. The provision of the positioning hole 8 can be used for positioning in the process of automated production, thereby improving the accuracy of machine folding. In addition, the positioning hole 8 can also be used for positioning when the lithium battery protection film is assembled with the lithium battery, thereby making the lithium battery protection film more adhesive to the lithium battery.

[0032] Further, the thickness of the rectangular base film 1, the first side film 2, the second side film 3 and the reinforcing film 4 is between 0.1mm and 0.3mm, so as to ensure the lightness and thinness of the lithium battery protection film.

[0033] In summary, the lithium battery protection film of the utility model can increase the thickness and tear resistance of the edge part of the protection film by setting the reinforcing film 4 and the second side edge film 3 which can overlap each other, and the folding line is easier to fold, and the utility model is suitable for automatic production. The rectangular bottom film 1, the first side edge film 2, the second side edge film 3 and the reinforcing film 4 are integrally formed, no additional design is needed in the production process, and the structure of the raw material can be fully utilized, the mechanical strength of the lithium battery protection film can be improved without additional reinforcing parts, material waste is avoided, and the lightness and thinness of the protection film can be considered.

[0034] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the utility model. Any figure mark in the claims should not be regarded as limiting the involved claims.

[0035] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A lithium battery protective film, characterized in that, include: Rectangular base film; Two first side films are symmetrically arranged on both sides of the rectangular bottom film along the two long sides of the rectangular bottom film; A plurality of second side films, each second side film being disposed on both sides of each first side film along the short side of each first side film; The second side membrane, which is located on the same side of the two first side membranes, can be folded and overlapped. and A reinforcing membrane is disposed on the long edge of the first side membrane. The reinforcing membrane can be folded toward the first side membrane and overlapped with the first side membrane, and formed into a reinforcing structure by welding. The rectangular bottom film, the first side film, the second side film, and the reinforcing film are integrally formed.

2. The lithium battery protective film according to claim 1, characterized in that, The length of the reinforcing membrane is equal to the length of the first side membrane, and the width of the reinforcing membrane is less than the width of the first side membrane; the width of the reinforcing membrane is between 2mm and 5mm.

3. The lithium battery protective film according to claim 1, characterized in that, A rectangular cutout is provided at the connection between the first side membrane and the reinforcing membrane along its long side; the rectangular cutouts are symmetrically arranged on the first side membrane and the reinforcing membrane.

4. The lithium battery protective film according to claim 1, characterized in that, At the connection between the first side membrane and the reinforcing membrane, a plurality of micropores are sequentially spaced along the long side of the first side membrane, and the plurality of micropores are arranged sequentially to form a first fold line; at the connection between the first side membrane and the rectangular bottom membrane, a plurality of micropores are sequentially spaced along the long side of the first side membrane, and the plurality of micropores are arranged sequentially to form a second fold line.

5. The lithium battery protective film according to claim 1, characterized in that, At the connection between the first side membrane and the second side membrane, a plurality of micropores are sequentially spaced along the short side of the first side membrane, and the plurality of micropores are arranged sequentially to form a third fold line.

6. The lithium battery protective film according to claim 5, characterized in that, At the junction of the first side membrane and the second side membrane, two parallel third fold lines are provided along the short side of the first side membrane; there is a gap between the two third fold lines.

7. The lithium battery protective film according to claim 6, characterized in that, The distance of the gap is between 0.5mm and 1mm.

8. The lithium battery protective film according to claim 1, characterized in that, The corner where the rectangular bottom film connects to the first side film is an arc angle.

9. The lithium battery protective film according to claim 1, characterized in that, The rectangular base film has positioning holes at both ends along its length, and the two positioning holes have different shapes.

10. The lithium battery protective film according to claim 1, characterized in that, The thickness of the rectangular base film, the first side film, the second side film, and the reinforcing film is between 0.1 mm and 0.3 mm.

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