Soft package lithium ion battery two-package packaging structure

Abstract

The utility model discloses a soft package lithium ion battery two-seal packaging structure, and belongs to the technical field of batteries. The packaging structure comprises an upper sealing head and a lower sealing head, the opposite sides of the upper sealing head and the lower sealing head are working faces arranged in parallel, each working face of the upper sealing head and / or the lower sealing head is provided with a groove part, the depth of each groove part is matched with the thickness of an aluminum plastic film, and the groove parts and the ends of the working faces are arranged at preset intervals. According to the utility model, the groove part is arranged on the working surface of the upper sealing head and / or the lower sealing head, and the depth of the groove part is matched with the thickness of the aluminum plastic film, so that the extrusion on the middle part of the aluminum plastic film can be reduced during secondary sealing, and the overpressure overflow amount of PP layer molten liquid of the aluminum plastic film is reduced; the problem that the PP layer melting liquid of the aluminum plastic film of the battery is overpressed and overflows too much is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, in particular to a double-sealed packaging structure for a soft-pack lithium-ion battery. Background Art

[0002] For soft-pack lithium-ion batteries with single-side bipolar tabs, the commonly used packaging methods in the industry are generally in the following order: bottom seal - top seal - side seal - two seals. In the prior art, the two-seal packaging structure consists of an upper seal head and a lower seal head. The parts where the upper seal head and the lower seal head process the aluminum-plastic film are two parallel planes. This leads to the problem that when the upper seal head and the lower seal head are used to package the battery, the melted liquid of the PP layer of the aluminum-plastic film is easily over-pressurized and overflows excessively. Utility Model Content

[0003] Purpose of the utility model: To provide a double-sealed packaging structure for a soft-pack lithium-ion battery, by arranging a groove on the working surface of an upper head and / or a lower head and matching the depth of the groove with the thickness of the aluminum-plastic film, the problem of excessive overflow of melted liquid from the PP layer of the aluminum-plastic film of the battery due to overpressure is solved.

[0004] The technical solution of the utility model is: a two-sealing packaging structure of a soft-pack lithium-ion battery comprises: an upper sealing head and a lower sealing head.

[0005] The opposite sides of the upper head and the lower head are parallel working surfaces.

[0006] A groove portion is arranged on each working surface of the upper sealing head and / or the lower sealing head, and the depth of the groove portion matches the thickness of the aluminum-plastic film.

[0007] The groove portion is spaced apart from the end of the working surface by a predetermined distance.

[0008] In a further embodiment, a groove portion is provided on the upper head or the lower head, and the depth of the groove portion is equal to the thickness of an aluminum-plastic film.

[0009] In a further embodiment, the depth of the groove portion is between 113 and 153 μm.

[0010] In a further embodiment, the upper head and the lower head are provided with grooves, the grooves on the upper head and the lower head correspond to each other, and the sum of the depths of the grooves on the upper head and the lower head is equal to the thickness of an aluminum-plastic film.

[0011] In a further embodiment, the sum of the depths of the grooves on the upper head and the lower head is between 113 and 153 μm.

[0012] In a further embodiment, the distances between the groove portion and two ends of the working surface are equal, and the sum of the distances between the groove portion and two ends of the working surface is equal to between 1 / 18 and 3 / 22 of the total length of the working surface.

[0013] The beneficial effects of the utility model are as follows: by arranging a groove portion on the working surface of the upper sealing head and / or the lower sealing head and making the depth of the groove portion match the thickness of the aluminum-plastic film, the extrusion on the middle part of the aluminum-plastic film can be reduced during the second sealing, the amount of melted liquid of the PP layer of the aluminum-plastic film overflowing due to overpressure is reduced, and the problem of excessive melted liquid overflowing from the PP layer of the aluminum-plastic film of the battery due to overpressure is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an axonometric schematic diagram of the upper head of the utility model.

[0015] Figure 2 It is a cross-sectional schematic diagram of an embodiment of the utility model in which only the upper sealing head is provided with a groove portion so that the upper sealing head and the lower sealing head perform double sealing packaging work on the aluminum-plastic film.

[0016] Figure 3 The utility model is a cross-sectional schematic diagram of an embodiment in which both the upper sealing head and the lower sealing head are provided with groove parts so that the upper sealing head and the lower sealing head can perform double sealing and packaging work on the aluminum-plastic film.

[0017] The reference numerals shown in the figure are: upper head 100 , groove portion 101 , working surface 102 , mounting hole 103 , lower head 200 , aluminum-plastic film 300 , PP layer 301 . DETAILED DESCRIPTION

[0018] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0019] The present application discloses a double-sealed packaging structure for a soft-pack lithium-ion battery. By arranging a groove on the working surface of an upper head and / or a lower head and matching the depth of the groove with the thickness of the aluminum-plastic film, the problem of excessive overflow of melted liquid from the PP layer of the battery's aluminum-plastic film due to overpressure is solved.

[0020] In the first embodiment, the double-sealed packaging structure includes an upper sealing head 100 and a lower sealing head 200 .

[0021] The opposite sides of the upper head 100 and the lower head 200 are parallel working surfaces 102 .

[0022] A groove portion 101 is provided on each working surface 102 of the upper sealing head 100 and / or the lower sealing head 200 , and the depth of the groove portion 101 matches the thickness of the aluminum-plastic film 300 .

[0023] The groove portion 101 and the end portion of the working surface 102 are spaced apart by a predetermined distance.

[0024] Regarding the upper head 100 and the lower head 200, one end of the upper head 100 and the lower head 200 is provided with a working surface 102, and the other end is provided with a mounting end. Figure 1 The upper head 100 shown is an L-shaped structure, wherein a plurality of waist-shaped mounting holes 103 are provided on the mounting end, and the upper head 100 and the lower head 200 are mounted on the packaging device through the mounting holes 103 .

[0025] In this embodiment, a groove portion 101 is provided on the upper head 100 or the lower head 200 , and the depth of the groove portion 101 is equal to the thickness of one aluminum-plastic film 300 , wherein the depth of the groove portion 101 is between 113 and 153 μm.

[0026] like Figure 2 In the illustrated embodiment, only the upper head 100 is provided with a groove portion 101, and the aluminum-plastic film 300 includes a nylon layer, an AI layer and a PP layer 301 arranged in sequence, and the depth of the groove portion 101 is equal to the thickness of one aluminum-plastic film 300, which means that the depth of the groove portion 101 is equal to the sum of the thicknesses of the nylon layer, the AI ​​layer and the PP layer 301 of one aluminum-plastic film 300. Figure 2 and 3 In the figure, only the PP layer 301 in the aluminum-plastic film 300 is marked independently. Figure 2 and 3 The PP layer 301 shown is a schematic diagram of the PP layers 301 of two aluminum-plastic films 300 being melted and bonded.

[0027] The depth setting of the groove portion 101 can avoid overpressure on the aluminum-plastic film 300 while ensuring the pressure of the upper head 100 and the lower head 200 on the aluminum-plastic film 300, thereby ensuring the quality of the double-seal packaging.

[0028] In this embodiment, the distances between the groove portion 101 and both ends of the working surface 102 are equal, and the sum of the distances between the groove portion 101 and both ends of the working surface 102 is equal to between 1 / 18 and 3 / 22 of the total length of the working surface 102 .

[0029] In a preferred embodiment, when the total length of the head is 180 cm, the distance between the groove portion 101 and the two ends of the working surface 102 is 5 cm, and the sum of the distances between the groove portion 101 and the two ends of the working surface 102 is 10 cm, that is, the sum of the distances between the groove portion 101 and the two ends of the working surface 102 is equal to 1 / 18 of the total length of the working surface 102.

[0030] When the total length of the head is 200 cm, the distance between the groove portion 101 and the two ends of the working surface 102 is 10 cm, and the sum of the distances between the groove portion 101 and the two ends of the working surface 102 is 20 cm, that is, the sum of the distances between the groove portion 101 and the two ends of the working surface 102 is equal to 1 / 10 of the total length of the working surface 102.

[0031] When the total length of the head is 220 cm, the distance between the groove portion 101 and the two ends of the working surface 102 is 15 cm, and the sum of the distances between the groove portion 101 and the two ends of the working surface 102 is 30 cm, that is, the sum of the distances between the groove portion 101 and the two ends of the working surface 102 is equal to 3 / 22 of the total length of the working surface 102.

[0032] Working principle: firstly, the upper head 100 and the lower head 200 are installed on the packaging device, and then the packaging device heats the upper head 100 and the lower head 200, and then the two aluminum-plastic films 300 are arranged between the upper head 100 and the lower head 200, and the PP layers 301 of the upper head 100 and the lower head 200 are arranged relatively, and then the packaging device drives the upper head 100 to move toward the lower head 200, so that the working surface 102 contacts with the aluminum-plastic film 300 first, so that the distance between the two ends of the upper head 100 and the lower head 200 is smaller than the distance in the middle position, so that the melted PP layers 301 of the two aluminum-plastic films 300 can be sealed in the groove 101 between the working surfaces 102, even if the working surface 102 over-presses the aluminum-plastic film 300, because there are enough PP layers 301 bonded at the groove 101, the overall second sealing quality of the aluminum-plastic film 300 is guaranteed.

[0033] In the second embodiment, on the basis of the first embodiment, both the upper head 100 and the lower head 200 are provided with a groove portion 101 .

[0034] The grooves 101 on the upper head 100 and the lower head 200 are matched with each other, and the sum of the depths of the grooves 101 on the upper head 100 and the lower head 200 is equal to the thickness of one aluminum-plastic film 300 .

[0035] The sum of the depths of the grooves 101 on the upper head 100 and the lower head 200 is between 113 and 153 μm.

[0036] This embodiment can also make the distance between the two ends of the upper head 100 and the lower head 200 smaller than the distance in the middle during the double sealing operation, so that the melted PP layers 301 of the two aluminum-plastic films 300 can be sealed in the groove 101 between the working surfaces 102. However, compared with the first embodiment, the depth of the two grooves 101 on the upper head 100 and the lower head 200 is smaller, the required processing accuracy is higher, and the processing cost is higher.

[0037] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. A soft-pack lithium-ion battery double-seal packaging structure, characterized in that: include: Upper head and lower head; The opposite sides of the upper head and the lower head are parallel working surfaces; A groove portion is provided on each working surface of the upper head and / or the lower head, and the depth of the groove portion matches the thickness of the aluminum-plastic film; The groove portion is spaced apart from the end of the working surface by a predetermined distance.

2. A double-seal packaging structure for a soft-pack lithium-ion battery according to claim 1, characterized in that: The upper sealing head or the lower sealing head is provided with a groove portion, and the depth of the groove portion is equal to the thickness of an aluminum-plastic film.

3. A soft-pack lithium-ion battery double-seal packaging structure according to claim 2, characterized in that: The depth of the groove portion is between 113 μm and 153 μm.

4. The double-seal packaging structure of a soft-pack lithium-ion battery according to claim 1, characterized in that: The upper head and the lower head are provided with grooves, the grooves on the upper head and the lower head are matched with each other, and the sum of the depths of the grooves on the upper head and the lower head is equal to the thickness of one aluminum-plastic film.

5. A double-seal packaging structure for a soft-pack lithium-ion battery according to claim 4, characterized in that: The sum of the depths of the grooves on the upper head and the lower head is between 113 and 153 μm.

6. The double-seal packaging structure of a soft-pack lithium-ion battery according to claim 1, characterized in that: The distances between the groove portion and the two ends of the working surface are equal, and the sum of the distances between the groove portion and the two ends of the working surface is equal to between 1 / 18 and 3 / 22 of the total length of the working surface.

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