Lithium battery packaging structure

Abstract

The utility model discloses a lithium battery packaging structure which comprises a rectangular bottom film, two first side films, a plurality of second side films and a rectangular reinforcing plate. The two first side films are symmetrically arranged on the two sides of the rectangular bottom film along the two long sides of the rectangular bottom film. The second side films are symmetrically arranged on the two sides of the first side film along the short edges of the first side films; the second side films arranged on the same side of the two first side films can be folded and overlapped; the rectangular reinforcing plate is attached to the rectangular bottom film and used for reinforcing the strength of the rectangular bottom film. Wherein the first side film and the second side film can be folded to form a rectangular accommodating structure with an opening; and the battery cell is placed in the rectangular accommodating structure and is propped against the rectangular reinforcing plate. The second side film of the lithium battery packaging structure can be folded and overlapped, so that the mechanical strength of the lithium battery packaging structure can be improved. The rectangular reinforcing plate is attached to the rectangular bottom film, so that the mechanical strength and the tearing resistance of the rectangular bottom film can be improved, and better protection is provided for the bottom of the battery cell.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium battery technical field, specifically about a lithium battery packing structure. 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. Lithium battery includes cell and shell, in the use process of lithium battery, the surface of the cell will be 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 plane light insulating film has the problems of insufficient mechanical strength and insufficient tear resistance under the premise of lightness, and the bottom of the insulating film is subjected to a large pressure during use, which is easy to be damaged during transportation and use, causing short circuit of lithium battery and greatly reducing 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 present utility model and should not be regarded as an acknowledgment or any form of suggestion that it forms prior art that is publicly known. SUMMARY

[0004] The utility model aims at providing a lithium battery packing structure, which can improve the mechanical strength and tear resistance of the rectangular bottom film by bonding the rectangular reinforcing plate with the rectangular bottom 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 packing structure, comprising: a rectangular bottom film, two first side films, a plurality of second side films and a rectangular reinforcing plate. The two first side films are symmetrically arranged on both sides of the rectangular bottom film along the two long edges of the rectangular bottom film; each second side film is symmetrically arranged on both sides of the first side film along the short edge of each first side film; the second side films arranged on the same side of the two first side films can be folded and overlapped; the rectangular reinforcing plate is bonded with the rectangular bottom film to strengthen the strength of the rectangular bottom film; wherein the first side film and the second side film can be folded to form a rectangular containing structure with an opening; the cell is placed in the rectangular containing structure and abuts against the rectangular reinforcing plate.

[0006] In one or more embodiments of the utility model, the length of the rectangular bottom film is greater than the length of the rectangular reinforcing plate, and the two ends of the rectangular bottom film protrude from the two ends of the rectangular reinforcing plate to form a free folding section.

[0007] In one or more embodiments of the utility model, the two ends of the free folding section have gaps with the first side film, and the two ends of the free folding section have arc-shaped corners.

[0008] In one or more embodiments of the utility model, a folding line is etched on the connecting part of the first side film and each second side film along the extension direction of the short side of the first side film.

[0009] In one or more embodiments of the utility model, two folding lines are arranged in parallel at the connecting part of the first side film and the second side film, and there is a gap between the two folding lines.

[0010] In one or more embodiments of the utility model, one of the second side films arranged on the same side of the two first side films has a width smaller than that of the rectangular bottom film, and the other second side film has a width equal to that of the rectangular bottom film.

[0011] In one or more embodiments of the utility model, the thickness of the rectangular bottom film, the first side film and the second side film is less than 0.3mm.

[0012] In one or more embodiments of the utility model, the thickness of the rectangular reinforcing plate is between 0.3mm and 1.5mm.

[0013] In one or more embodiments of the utility model, a first positioning hole is formed in the rectangular bottom film; a second positioning hole is formed in the rectangular reinforcing plate at a position corresponding to the first positioning hole; and the first positioning hole and the second positioning hole are in communication.

[0014] In one or more embodiments of the utility model, a plurality of first flow guide holes are formed in the rectangular bottom film; a plurality of second flow guide holes are formed in the rectangular reinforcing plate at positions corresponding to the first flow guide holes; and the first flow guide holes and the second flow guide holes are in communication.

[0015] Compared with the prior art, the second side film of the lithium battery packaging structure can be folded and overlapped, which can improve the mechanical strength of the lithium battery packaging structure. The rectangular reinforcing plate and the rectangular bottom film can improve the mechanical strength and tear resistance of the rectangular bottom film, and provide better protection for the bottom of the battery cell. The two folding lines can make the lithium battery packaging structure more closely fit the battery cell. In addition, the lithium battery packaging structure is made of insulating material, which can also improve the overall insulation performance of the lithium battery. 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 some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the protection scope of the present application.

[0017] Figure 1 A planar development view of the lithium battery packaging structure in an embodiment of the present application;

[0018] Figure 2 A schematic view of the rectangular bottom film, the first side film and the second side film in an embodiment of the present application;

[0019] Figure 3 A schematic view of the rectangular reinforcing plate in an embodiment of the present application.

[0020] Main figure mark explanation:

[0021] 1-rectangular bottom film, 11-free folding section, 111-arc-shaped corner, 12-first positioning hole, 13-first flow guide hole, 2-first side film, 3-second side film, 4-rectangular reinforcing plate, 41-second positioning hole, 42-second flow guide hole, 5-folding line. Specific implementation

[0022] 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 some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the protection scope of the present application.

[0023] As Figures 1-3 shown, a lithium battery packaging structure in an embodiment of the present application comprises: a rectangular bottom film 1, two first side films 2, a plurality of second side films 3 and a rectangular reinforcing plate 4. The two first side films 2 are symmetrically arranged on both sides of the rectangular bottom film 1 along the long edges of the rectangular bottom film 1. The plurality of second side films 3 are symmetrically arranged on both sides of each first side film 2 along the short edges 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 overlapped. The rectangular reinforcing plate is attached to the rectangular bottom film 1 and is used to strengthen the strength of the rectangular bottom film 1. Among them, the first side film 2 and the second side film 3 can be folded to form a rectangular containing structure with an opening. The cell is placed in the rectangular containing structure and abuts against the rectangular reinforcing plate 4.

[0024] In the above embodiment, the two first side films 2 of the lithium battery packaging structure can be folded along the long edges of the rectangular reinforcing plate 4 to be substantially 90° with the rectangular bottom film 1. The second side film 3 can be folded along the short edge of the first side film 2 to be substantially 90° with the first side film 2. The two second side films 3 arranged on the same side overlap each other and can be connected by ultrasonic welding. The lithium battery packaging structure is folded to form a rectangular accommodating structure for accommodating the battery cell.

[0025] The second side film 3 of the lithium battery packaging structure can be folded and arranged in an overlapping manner, and the rectangular reinforcing plate 4 is arranged on the rectangular bottom film 1, thereby improving the mechanical strength of the lithium battery packaging structure. In particular, compared with the single-layer bottom film in the prior art, the arrangement of the rectangular reinforcing plate 4 can improve the mechanical strength and tear resistance of the rectangular bottom film 1, and provide better protection for the bottom of the battery cell.

[0026] In an embodiment, as shown in Figure 3 the length of the rectangular bottom film 1 is greater than the length of the rectangular reinforcing plate 4. The two ends of the rectangular bottom film 1 protrude beyond the two ends of the rectangular reinforcing plate 4 to form a free folding section 11. The free folding section 11 can be connected to the bottom of the second side film 3 by ultrasonic welding or other means, thereby improving the connection strength between the second side film 3 and the rectangular bottom film 1, and making the rectangular accommodating space formed by the lithium battery packaging structure more stable.

[0027] Further, the two ends of the free folding section 11 have gaps with the first side film 2, and the two ends of the free folding section 11 have arc-shaped corners 111. The two ends of the free folding section 11 have gaps with the first side film 2 arranged on both sides of the free folding section 11, which can improve the foldability of the free folding section 11 relative to the first side film 2 and reduce interference of the first side film 2. The two ends of the free folding section 11 have arc-shaped corners 111, which can further reduce the interference between the free folding section 11 and the first side film 2.

[0028] In an embodiment, in order to improve the structural consistency of the lithium battery packaging structure after folding to meet the precision requirements of automatic production. The connection between the first side film 2 and each second side film 3 is etched with a folding line 5 along the extension direction of the short edge of the first side film 2. The second side film 3 can be folded in the direction of the first side film 2 along the folding line 5.

[0029] In the above embodiment, the connection between the first side film 2 and the second side film 3 can be provided with two folding lines 5 in parallel, and the two folding lines 5 have a gap therebetween. The arrangement of the two folding lines 5 and the gap forms an arc at the folding position of the first side film 2 and the second side film 3, thereby matching the arc of the edge of the battery cell.

[0030] In an embodiment, the width of one of the second side films 3 arranged on the same side of the two first side films 2 is smaller than the width of the rectangular bottom film 1, and the width of the other second side film 3 is equal to the width of the rectangular bottom film 1. Here, the width of the second side film 3 equal to the width of the rectangular bottom film 1 can be substantially equal to each other. In this way, the mechanical strength and the tear resistance of the lithium battery packaging structure can be enhanced, and the material consumption of the lithium battery packaging structure can be reduced, so that the production cost can be controlled.

[0031] In an embodiment, in order to ensure the thinness of the lithium battery packaging structure, the thicknesses of the rectangular bottom film 1, the first side film 2 and the second side film 3 are less than 0.3 mm. At the same time, the thickness of the rectangular reinforcing plate 4 is between 0.3 mm and 1.5 mm, which can cooperate with the rectangular bottom film 1 to improve the strength of the bottom of the lithium battery packaging structure. In addition, it can be understood that the rectangular bottom film 1, the first side film 2, the second side film 3 and the rectangular reinforcing plate 4 are made of insulating materials because they are in direct contact with the battery cell to avoid causing short circuit of the battery cell. Therefore, the lithium battery packaging structure can also improve the insulation performance of the lithium battery because it is wrapped outside the battery cell.

[0032] In an embodiment, as shown in Figure 2 and Figure 3 , the rectangular bottom film 1 is provided with a first positioning hole 12. The rectangular reinforcing plate 4 is provided with a second positioning hole 41 at a position corresponding to the first positioning hole 12. The first positioning hole 12 and the second positioning hole 41 are in communication. The first positioning hole 12 and the second positioning hole 41 can be used for positioning and welding between the rectangular bottom film 1 and the rectangular reinforcing plate 4, and can also be used for positioning and installing between the lithium battery packaging structure and the battery cell, so as to improve the precision of automatic production. At the same time, the first positioning hole 12 and the second positioning hole 41 can also provide a flow space for the electrolyte, so that the electrolyte and the battery cell can react more fully, and the performance of the battery can be improved.

[0033] Further, the rectangular bottom film 1 is provided with a plurality of first flow holes 13, and the rectangular reinforcing plate 4 is provided with a plurality of second flow holes 42 at positions corresponding to the first flow holes 13. The first flow holes 13 and the second flow holes 42 are in communication. The flow holes can avoid the situation that the rectangular reinforcing plate 4 and the battery cell are tightly attached and the electrolyte cannot flow between them.

[0034] In summary, the second side film 3 of the lithium battery packaging structure of the utility model can be folded and overlapped, so as to improve the mechanical strength of the lithium battery packaging structure. The rectangular reinforcing plate 4 and the rectangular bottom film 1 can be attached to improve the mechanical strength and tear resistance of the rectangular bottom film 1, and provide better protection for the bottom of the battery cell. The two folding lines 5 can make the lithium battery packaging structure and the battery cell more attached. In addition, the lithium battery packaging structure is made of insulating materials, which can also improve the overall insulation performance of the lithium battery.

[0035] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims concerned.

[0036] Furthermore, it should be understood that although the present specification describes exemplary embodiments, the application is not limited to only one independent technical solution in each embodiment, and the specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A lithium battery packaging structure, characterized by, The application relates to a rectangular battery cell container, comprising: a rectangular bottom film; two first side films symmetrically arranged on two sides of the rectangular bottom film along two long sides of the rectangular bottom film; a plurality of second side films, each of which is symmetrically arranged on two sides of each first side film along a short side of the first side film; the second side films arranged on the same side of the two first side films can be folded and arranged in an overlapped manner; a rectangular reinforcing plate which is attached to the rectangular bottom film and is used for reinforcing the strength of the rectangular bottom film; wherein the first side film and the second side film can be folded to form a rectangular containing structure with an opening; an electric cell is arranged in the rectangular containing structure and is in abutment with the rectangular reinforcing plate. The length of the rectangular bottom film is greater than the length of the rectangular reinforcing plate, and the two ends of the rectangular bottom film protrude from the two ends of the rectangular reinforcing plate to form free folding sections.

2. The lithium battery packaging structure according to claim 1, characterized by, The two ends of the free folding section have a gap with the first side film, and the two ends of the free folding section have arc-shaped corners.

3. The lithium battery packaging structure according to claim 2, wherein The connecting part of the first side film and each second side film is etched with a folding line along the extension direction of the short side of the first side film.

4. The lithium battery packaging structure according to claim 1, wherein Two folding lines are arranged in parallel at the connecting part of the first side film and the second side film, and a space is arranged between the two folding lines.

5. The lithium battery packaging structure according to claim 4, wherein The width of one of the second side films arranged on the same side of the two first side films is smaller than the width of the rectangular bottom film, and the width of the other second side film is equal to the width of the rectangular bottom film.

6. The lithium battery packaging structure according to claim 1, wherein The thickness of the rectangular bottom film, the first side film and the second side film is less than 0.3 mm.

7. The lithium battery packaging structure according to claim 1, wherein The thickness of the rectangular reinforcing plate is between 0.3 mm and 1.5 mm.

8. The lithium battery packaging structure according to claim 1, wherein A first positioning hole is arranged on the rectangular bottom film; a second positioning hole is arranged on the rectangular reinforcing plate at a position corresponding to the first positioning hole; and the first positioning hole and the second positioning hole are in communication.

9. The lithium battery packaging structure according to claim 1, wherein, A plurality of first flow guide holes are arranged on the rectangular bottom film; a plurality of second flow guide holes are arranged on the rectangular reinforcing plate at positions corresponding to the first flow guide holes; and the first flow guide holes and the second flow guide holes are in communication.

10. The lithium battery packaging structure of claim 1, wherein, ​

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