Lithium battery packaging film

Abstract

The utility model relates to the technical field of packaging films, and discloses a lithium battery packaging film which comprises an insulating layer, a reinforcing net is fixedly connected in the insulating layer, heat-conducting silica gel is fixedly connected to the rear side of the reinforcing net, a wear-resistant layer is fixedly connected to the front side of the insulating layer, a buffer layer is fixedly connected to the front side of the wear-resistant layer, and the heat-conducting silica gel is fixedly connected to the rear side of the buffer layer. A plurality of vent holes are formed in the top of the buffer layer, a plurality of buffer blocks are fixedly connected to the front side of the buffer layer, a plurality of grooves are formed in the rear side of the heat conduction silica gel, and an L-shaped connecting block is fixedly connected to the left side of the rear portion of the insulating layer. According to the utility model, the plurality of elastic buffer blocks absorb and disperse impact force, the vent holes discharge air step by step when being pressed, the wear-resistant layer reduces the damage of sharp objects to the internal structure, and the reinforcing net in the insulating layer disperses the impact force in a plurality of directions and enhances the overall strength, so that the concentrated impact of the sharp objects is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to packing film technical field especially relates to a lithium battery packing film. BACKGROUND

[0002] In the production and application system of lithium battery, the lithium battery packing film is a crucial component, as a direct packaging material of lithium battery, it undertakes the heavy responsibility of isolating the external environment, protecting the internal structure of battery and the stability of chemical system, on the one hand, the packing film needs to effectively block the invasion of moisture and oxygen in the air, prevent the adverse chemical reactions such as oxidation and hydrolysis in the battery, maintain the stability and durability of battery performance, on the other hand, in the manufacturing, transportation and use process of battery, the packing film also needs to provide necessary physical protection for the battery, resist a certain degree of external force impact, ensure the integrity of battery structure, avoid the damage of internal electrode and electrolyte key components.

[0003] The early lithium battery packing film is mostly composed of a simple multilayer structure, including outer plastic film, middle barrier layer and inner heat sealing layer, although the outer plastic film can provide certain protection, but the material is ordinary, the cushioning performance is poor, when facing relatively strong external force impact, it is easy to be damaged, and cannot effectively protect the battery, when the lithium battery is collided in the process of transportation and handling, the early packing film is often damaged due to poor protection ability, resulting in serious problems such as battery leakage and short circuit, with the development of technology, the existing lithium battery packing film has been significantly improved in structure, some packing films increase the buffer structure, which can absorb and disperse external force to a certain extent, and avoid the direct impact of the battery, however, the existing packing film still has the problem of insufficient protection ability in actual use, since the direction and size of the collision impact are uncertain in the transportation process, when encountering local concentrated impact of sharp objects, the buffer structure in the existing packing film is easily compressed or even punctured in the stress concentration area due to the material characteristics, resulting in buffer failure, which cannot provide continuous and effective protection for the lithium battery, so that the battery still faces the risk of damage due to impact. SUMMARY

[0004] In order to make up for the above shortcomings, the utility model provides a lithium battery packing film, which aims at improving the problem that the stress concentration area is easily compressed or even punctured when encountering local concentrated impact of sharp objects in the prior art, resulting in buffer failure.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: a lithium battery packaging film, including insulating layer, the inside fixed connection of insulating layer has reinforcing net, the back fixed connection of reinforcing net has heat conduction silica gel, the front fixed connection of insulating layer has wear -resisting layer, the front fixed connection of wear -resisting layer has buffer layer, the top of buffer layer is provided with a plurality of air holes, the front fixed connection of buffer layer has a plurality of buffer blocks, the back of heat conduction silica gel is provided with a plurality of grooves.

[0006] As further description of the above technical solution:

[0007] The rear left side of the insulating layer is fixedly connected with an L-shaped connecting block, and the rear right side of the insulating layer is fixedly connected with an adhesive glue.

[0008] As further description of the above technical solution:

[0009] The rear side of the adhesive strip is fixedly connected with an adhesive strip, and the size of the adhesive strip is consistent with the size of the adhesive glue.

[0010] As further description of the above technical solution:

[0011] The adjacent side of the two insulating layers is provided with a tear line, and the outer wall of the adhesive strip is smoothly processed.

[0012] As further description of the above technical solution:

[0013] The upper and lower sides of the insulating layer are fixedly connected with an insulating column, and the rear side of the insulating column is fixedly connected with a sealing strip.

[0014] As further description of the above technical solution:

[0015] The grid of the reinforcing net is in a diamond structure, and the grid length of the reinforcing net is 1mm-2mm.

[0016] As further description of the above technical solution:

[0017] The buffer block is in a curved spherical shape, and the height of the buffer block is 2mm-3mm.

[0018] As further description of the above technical solution:

[0019] The air hole is in a ladder shape, and the maximum diameter of the air hole is 1.5mm-2mm.

[0020] The utility model has the following beneficial effects:

[0021] 1. The utility model discloses a plurality of elastic buffer blocks are used for absorbing and dispersing impact force, and the air hole is arranged on the buffer layer, and the air is discharged step by step when being pressed, and the buffer is formed, and the impact force after buffering is transmitted to the wear -resistant layer, the damage of sharp object to internal structure is reduced, and the remaining impact force is dispersed, and continues to be transmitted to the insulation layer, the reinforcing net in its inside disperses the impact force in a plurality of directions, enhances the overall strength, and the heat -conducting silica gel absorbs energy when being impacted, thereby effectively preventing the concentrated impact of sharp object. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a perspective view of the lithium battery packaging film provided by the utility model;

[0023] Figure 2 It is the enlarged view of A of Figure 1

[0024] Figure 3 It is a front view of the lithium battery packaging film provided by the utility model;

[0025] Figure 4 It is a rear view of the lithium battery packaging film provided by the utility model;

[0026] Figure 5 It is a sectional view of the lithium battery packaging film provided by the utility model.

[0027] Legend:

[0028] 1, insulation layer, 2, reinforcing net, 3, heat -conducting silica gel, 4, wear -resistant layer, 5, buffer layer, 6, air hole, 7, buffer block, 8, recess, 9, L-shaped connecting block, 10, unsealing line, 11, adhesive strip, 12, sealing strip, 13, insulating column, 14, adhesive glue. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0030] Reference Figure 1 , Figure 3 and Figure 5 ​The utility model provides an embodiment: a lithium battery packaging film, the inside fixed connection of insulating layer 1 has reinforcing net 2, reinforcing net 2 can further scatter impact force in multiple directions, the rear side fixed connection of reinforcing net 2 has heat conducting silica gel 3, heat conducting silica gel 3 is responsible for conducting heat to go out when battery works, maintains the suitable working temperature environment of battery, the front side fixed connection of insulating layer 1 has wear -resisting layer 4, and wear -resisting layer 4 resists the scratch and puncture of sharp object by the wear -resisting property of itself, the front side fixed connection of wear -resisting layer 4 has buffer layer 5, and the top of buffer layer 5 is equipped with a plurality of air holes 6, and the front side fixed connection of buffer layer 5 has a plurality of buffer blocks 7, and the rear side of heat conducting silica gel 3 is equipped with a plurality of grooves 8, and the structure deformation of groove 8 can also absorb part energy, and auxiliary overall protection,

[0031] Specifically, when the sharp object produces local concentrated impact, it will first contact the buffer layer 5, and the multiple buffer blocks 7 on the front side of the buffer layer 5 have a certain elasticity, and can preliminarily absorb part of the impact force through elastic deformation in the moment of impact, and disperse part of the force. At the same time, the multiple air holes 6 on the top of the buffer layer 5 play a role. Since the air holes 6 have a ladder-shaped structure, when the buffer layer 5 is pressed, air will be gradually discharged through the air holes 6, forming multiple levels of buffering in the discharge process, further weakening the impact force, and at the same time avoiding the buffer layer 5 from being quickly compressed to the limit due to excessive force, greatly reducing the risk of being poked through. The impact force preliminarily weakened by the buffer layer 5 is transmitted to the wear-resistant layer 4, which resists the scratch and puncture of sharp objects by its own wear-resistant properties, reduces the direct damage of sharp objects to the subsequent structure, and at the same time disperses the remaining impact force to a certain extent, reducing the impact strength. Then, the impact force reaches the insulating layer 1, and the reinforcing net 2 fixed inside the insulating layer 1 can further disperse the impact force in multiple directions, enhancing the overall strength of the insulating layer 1 and preventing damage due to excessive local force. The heat conducting silica gel 3 connected to the rear side of the reinforcing net 2 also plays an important role in the protection process. On the one hand, the heat conducting silica gel 3 is responsible for conducting heat to go out when battery works, maintaining the suitable working temperature environment of battery. On the other hand, it can buffer and disperse the impact force when impacted. Moreover, the multiple grooves 8 on the rear side of the heat conducting silica gel 3 not only increase the air flow space between the battery, which is beneficial to heat dissipation, but also absorb part of the energy through structural deformation when impacted, assisting overall protection, thereby preventing local concentrated impact of sharp objects very well.

[0032] Reference Figure 1 , Figure 2 and Figure 4The rear left side of the insulating layer 1 is fixedly connected with an L-shaped connecting block 9, the L-shaped connecting block 9 can provide a stable and reliable connecting point, the rear right side of the insulating layer 1 is fixedly connected with a bonding glue 14, the bonding glue 14 can tightly bond the right side edge of the packaging film with the part that has been fixed on the left side, the rear side of the bonding glue 14 is fixedly connected with a bonding strip 11, the bonding strip 11 can improve the firmness of bonding, the size of the bonding strip 11 is consistent with the size of the bonding glue 14, and the bonding strip 11 can uniformly disperse the pulling force from each direction, the adjacent side of the two insulating layers 1 is provided with a tearing line 10, the tearing line 10 can easily tear the packaging film when the lithium battery needs to be taken out, the outer wall of the bonding strip 11 is smoothly processed, the bonding strip 11 can avoid scratching the hands of the operator due to sharp corners, the upper and lower sides of the insulating layer 1 are fixedly connected with an isolation column 13, the isolation column 13 can separate the upper and lower surfaces of the insulating layer 1 and the battery pack shell by a certain distance, and the rear side of the isolation column 13 is fixedly connected with a sealing strip 12, the sealing strip 12 can form a tight sealing structure between the isolation column 13 and the battery pack shell.

[0033] Specifically, the L-shaped connecting block 9 can provide a stable and reliable connecting point, the bonding glue 14 can tightly bond the right side edge of the packaging film with the part that has been fixed on the left side, the bonding strip 11 can serve as a reinforcing structure when the bonding glue 14 plays a bonding role, further improving the firmness of bonding, the size of the bonding strip 11 is consistent with the size of the bonding glue 14, the bonding strip 11 can uniformly disperse the pulling force from each direction, avoid the phenomenon of glue separation due to excessive local stress at the bonding position, ensure the long-term stability of the sealing performance of the packaging film, the tearing line 10 can enable the user to easily tear the packaging film along the line when the lithium battery needs to be taken out, the operation is convenient and will not damage the lithium battery, the outer wall of the bonding strip 11 is smoothly processed, which can avoid scratching the hands of the operator due to sharp corners during the wrapping of the packaging film around the lithium battery and subsequent various operation processes, prevent accidental scratches on the shell or other components of the lithium battery, ensure the safety of the entire operation process and the integrity of the appearance and performance of the lithium battery, the isolation column 13 can separate the upper and lower surfaces of the insulating layer 1 and the battery pack shell by a certain distance, forming an effective insulating and isolating space, and the sealing strip 12 can form a tight sealing structure between the isolation column 13 and the battery pack shell, preventing external moisture, dust and other harmful gases from entering from the gap between the upper and lower surfaces of the insulating layer 1 and the battery pack shell.

[0034] Referring to Figure 1 , Figure 2 and Figure 5The grid of the reinforcing net 2 is in a diamond structure, which can evenly disperse external force to all directions when force is applied. The grid length of the reinforcing net 2 is 1mm-2mm, which ensures that the reinforcing net 2 has sufficient strength. The buffer block 7 is in a curved spherical shape, which can disperse impact force along the curved surface. The height of the buffer block 7 is 2mm-3mm, which provides sufficient deformation space. The air vent 6 is in a stepped shape, which can realize the step-by-step discharge of air. The maximum diameter of the air vent 6 is 1.5mm-2mm, which ensures that air can be smoothly discharged when extruded.

[0035] Specifically, the grid of the reinforcing net 2 is in a diamond structure, which can evenly disperse external force to all directions when force is applied, thereby enhancing the overall support effect of the reinforcing net 2 on the insulation layer 1. The grid length of the reinforcing net 2 is 1mm-2mm, which ensures that the reinforcing net 2 has sufficient strength, and at the same time, does not reduce the fine support effect on the insulation layer 1 due to the grid being too large, nor does it cause excessive material accumulation due to the grid being too small, thereby increasing the weight and cost of the packaging film. The buffer block 7 is in a curved spherical shape, which can disperse impact force along the curved surface, thereby avoiding damage to the lithium battery due to excessive local stress. The height of the buffer block 7 is 2mm-3mm, which provides sufficient deformation space. The air vent 6 is in a stepped shape, which can realize the step-by-step discharge of air. The maximum diameter of the air vent 6 is 1.5mm-2mm, which ensures that air can be smoothly discharged when extruded, thereby meeting the buffering requirement and preventing dust and impurities from entering the buffer layer 5.

[0036] Working principle: when the sharp object exerts local concentrated impact, the first contact is the buffer layer 5, the multiple buffer blocks 7 on the front side of the layer have a certain elasticity and can absorb part of the impact energy by elastic deformation at the moment of impact, and disperse the force, at the same time, the multiple air vents 6 on the top of the buffer layer 5 begin to play a role, these air vents 6 are in a stepped structure, when the buffer layer 5 is subjected to pressure, air will be discharged through the air vents 6 step by step, forming multiple levels of buffering, further reducing the impact force, in addition, this structure avoids the buffer layer 5 from being rapidly compressed to the limit due to excessive force, thereby significantly reducing the risk of being penetrated, the impact force weakened by the buffer layer 5 is transmitted to the wear-resistant layer 4, which resists scratching and piercing by the sharp object due to its wear-resistant properties, reduces direct damage to the subsequent structure, and disperses the remaining impact force to a certain extent, reducing the impact strength, then, the impact force is transmitted to the insulation layer 1, the fixed reinforcing net 2 inside the insulation layer 1 can further disperse the impact force in multiple directions, enhance the overall strength of the insulation layer 1, prevent damage due to excessive local force, and the heat-conducting silica gel 3 connected to the rear side of the reinforcing net 2 also plays an important role in protection, on the one hand, the heat-conducting silica gel 3 is responsible for conducting heat away when the battery is working, maintaining a suitable working temperature environment for the battery, on the other hand, when impacted, the heat-conducting silica gel 3 can buffer and disperse the impact force, in addition, the multiple grooves 8 on the rear side of the heat-conducting silica gel 3 not only increase the air flow space with the battery, which is beneficial to heat dissipation, but also the structure of the grooves 8 deforms to absorb part of the energy when impacted, assisting overall protection, thereby effectively preventing local concentrated impact by sharp objects.

[0037] Finally, it should be pointed out that: the above only describes preferred embodiments of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements for some technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium battery packaging film, comprising an insulating layer (1), characterized in that: The insulating layer (1) is fixedly connected to a reinforcing mesh (2), the rear side of the reinforcing mesh (2) is fixedly connected to a thermally conductive silicone rubber (3), the front side of the insulating layer (1) is fixedly connected to a wear-resistant layer (4), the front side of the wear-resistant layer (4) is fixedly connected to a buffer layer (5), the top of the buffer layer (5) is provided with multiple vent holes (6), the front side of the buffer layer (5) is fixedly connected to multiple buffer blocks (7), and the rear side of the thermally conductive silicone rubber (3) is provided with multiple grooves (8).

2. The lithium battery packaging film according to claim 1, characterized in that: An L-shaped connecting block (9) is fixedly connected to the left rear part of the insulating layer (1), and an adhesive (14) is fixedly connected to the right rear part of the insulating layer (1).

3. The lithium battery packaging film according to claim 2, characterized in that: An adhesive strip (11) is fixedly connected to the rear side of the adhesive (14), and the size of the adhesive strip (11) is the same as the size of the adhesive (14).

4. A lithium battery packaging film according to claim 3, characterized in that: A deseal line (10) is provided on one side of each of the two insulating layers (1), and the outer wall of the adhesive strip (11) is rounded.

5. A lithium battery packaging film according to claim 1, characterized in that: The insulating layer (1) is fixedly connected to both the upper and lower sides with an insulating post (13), and a sealing strip (12) is fixedly connected to the rear side of the insulating post (13).

6. A lithium battery packaging film according to claim 1, characterized in that: The mesh of the reinforcing mesh (2) has a rhomboid structure, and the side length of the mesh of the reinforcing mesh (2) is 1mm-2mm.

7. A lithium battery packaging film according to claim 1, characterized in that: The buffer block (7) is in the shape of a curved sphere, and the height of the buffer block (7) is 2mm-3mm.

8. A lithium battery packaging film according to claim 1, characterized in that: The vent (6) is stepped, and the maximum diameter of the vent (6) is 1.5mm-2mm.

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