A soft-pack semi-solid lithium-ion battery packaging structure

Abstract

The utility model discloses a soft-pack semi-solid lithium-ion battery packaging structure, including a double-layer aluminum-plastic film and a plurality of seals formed on the double-layer aluminum-plastic film by heat sealing; the space between the double-layer aluminum-plastic film is divided into a core package packaging space and a gas storage space by a plurality of seals; the core package packaging space and the gas storage space are connected by a PP tube, and the gas generated in the core package packaging space is discharged into the gas storage space through the PP tube; the overflowing gel electrolyte generated by the pressurized high-temperature curing of the liquid electrolyte in the core package packaging space is blocked in the core package packaging space by the corresponding seal. The packaging structure of the utility model forms a gas storage space through two heat seals and two pre-seals, which is used for exhausting and ensuring that the gel electrolyte does not remain at the final seal through the arrangement of the pre-seal and the PP tube, thereby solving the problem of poor final seal leakage caused by residual gel electrolyte.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-package semi-solid lithium-ion battery manufacturing, in particular to a soft-package semi-solid lithium-ion battery packaging structure. Background Art

[0002] In the manufacturing process of soft-pack semi-solid lithium-ion batteries, initiators are added to the liquid electrolyte and the liquid electrolyte is cured in situ under pressure and high temperature conditions. However, during pressurized curing, part of the free electrolyte overflows to the final sealing edge of the core package. After the high-temperature curing is completed, a large amount of gel electrolyte will remain at the final sealing position of the aluminum-plastic film, causing leakage due to poor final sealing. The amount of residual gel electrolyte can be reduced by reducing the amount of electrolyte, but at the same time, it will cause poor interface caused by poor wetting and deterioration of long-term cycle performance, and it is impossible to completely and stably solve the problem of poor final sealing leakage.

[0003] The existing technology usually uses manual removal of gel electrolyte: in order to reduce the impact of residual gel electrolyte on final sealing, most of the gel electrolyte at the final sealing edge is removed by manual wiping before final sealing, and then the final sealing is carried out. This can effectively reduce the final sealing defect rate, but there are still some final sealing defects caused by wiping dead corners or incomplete wiping.

[0004] However, the existing technology uses a manual method to remove the gel electrolyte, but the problem of leakage due to poor final sealing cannot be completely solved, and manual operation is extremely inconvenient. Equipment automation cannot be achieved at all, and only small batches can be tested manually.

[0005] Therefore, based on the above technical problems, technicians in this field urgently need to develop a soft-pack semi-solid lithium-ion battery packaging structure. Utility Model Content

[0006] The utility model aims to provide a soft-package semi-solid lithium-ion battery packaging structure, which makes the point gel electrolyte not remain at the final sealing position, and solves the problem of final sealing poor leakage caused by gel electrolyte residue.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The utility model discloses a soft-package semi-solid lithium-ion battery packaging structure, which comprises:

[0009] A double-layer aluminum-plastic film, wherein the double-layer aluminum-plastic film is coated on the outer side of the core package body; and

[0010] A plurality of seals are formed on the double-layer aluminum-plastic film by heat sealing;

[0011] The space between the double-layer aluminum-plastic film is divided into a core package packaging space and a gas storage space by a plurality of seals;

[0012] The core package packaging space and the gas storage space are connected through a PP tube, and the gas generated in the core package packaging space is discharged into the gas storage space through the PP tube;

[0013] The overflowing gel electrolyte generated by the pressurized and high-temperature solidification of the liquid electrolyte in the core package packaging space is blocked in the core package packaging space by the corresponding seal.

[0014] Furthermore, the size of the aluminum-plastic film is larger than that of the core package body, and when the core package body is placed on the double-layer aluminum-plastic film, the four sides of the aluminum-plastic film partially extend to the outside of the core package body;

[0015] The core package body is arranged at a position close to the lower end of the aluminum-plastic film, and the tabs at both ends of the core package body extend to the outside of the aluminum-plastic film.

[0016] Furthermore, the plurality of seals include:

[0017] Two symmetrical heat seals, namely the first heat seal and the second heat seal;

[0018] The first heat seal and the second heat seal are both formed at two ends of the aluminum-plastic film by heat-sealing and fusing two edges of the two layers of the aluminum-plastic film in the length direction.

[0019] Furthermore, the plurality of seals also include:

[0020] Two pre-seals, namely the first pre-seal and the second pre-seal;

[0021] The first pre-seal and the second pre-seal are both formed at corresponding positions of the aluminum-plastic film by heat sealing;

[0022] The first pre-seal and the second pre-seal extend along the length direction of the aluminum-plastic film;

[0023] The first pre-seal is arranged close to the core package body, and the second pre-seal is arranged close to the edge of the aluminum-plastic film.

[0024] Furthermore, the space enclosed by the two heat seals and the two pre-seals is the gas storage space;

[0025] The PP tube passes through the first pre-seal to form a structure with one end extending into the core package packaging space and the other end extending into the gas storage space.

[0026] Furthermore, a cutting section is formed along the first pre-seal away from the core package body;

[0027] After vacuum degassing, the upper structure of the aluminum-plastic film and the upper section of the PP tube are cut off along the cutting section;

[0028] The cut PP tube is welded to the inner wall of the PP tube by pressurized heat sealing to form a final seal.

[0029] In the above technical solution, the soft-pack semi-solid lithium-ion battery packaging structure provided by the utility model has the following beneficial effects:

[0030] The packaging structure of the utility model forms a gas storage space through two heat seals and two pre-seals for exhausting gas and ensures that gel electrolyte does not remain at the final seal through the arrangement of the pre-seal and the PP tube, thereby solving the problem of final seal leakage caused by gel electrolyte residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 A structural schematic diagram of a processing process of a soft-pack semi-solid lithium-ion battery packaging structure disclosed in an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the structure after packaging of a soft-pack semi-solid lithium-ion battery packaging structure disclosed in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 1. Core package body; 2. Aluminum-plastic film; 4. PP tube; 5. Cutting section; 6. Final seal;

[0036] 101. Extreme ear;

[0037] 201, core package packaging space; 202, gas storage space;

[0038] 301, first heat seal; 302, second heat seal; 303, first pre-seal; 304, second pre-seal. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] See also Figure 1 to Figure 2 As shown;

[0041] This embodiment discloses a soft-pack semi-solid lithium-ion battery packaging structure, which includes:

[0042] A double-layer aluminum-plastic film 2, the double-layer aluminum-plastic film 2 is coated on the outer side of the core package body 1; and

[0043] Multiple seals formed on the double-layer aluminum-plastic film 2 by heat sealing;

[0044] The space between the double-layer aluminum-plastic film 2 is divided into a core package packaging space 201 and a gas storage space 202 by multiple seals;

[0045] The core package packaging space 201 and the gas storage space 202 are connected through the PP tube 4, and the gas generated in the core package packaging space 201 is discharged into the gas storage space 202 through the PP tube 4;

[0046] The overflowing gel electrolyte generated by the pressurized and high-temperature solidification of the liquid electrolyte in the core package packaging space 201 is blocked in the core package packaging space 201 by the corresponding seal.

[0047] Specifically, the present embodiment discloses a novel packaging structure. First, a core package body 1 is coated with a double-layer aluminum-plastic film 2, and the core package body 1 is coated and sealed between the double-layer aluminum-plastic film 2. The packaging structure of the present embodiment forms a plurality of seals by heat sealing and welding. The space between the double-layer aluminum-plastic film 2 is divided into two parts by the arrangement position of the seals, namely, a core package packaging space 201 and a gas storage space 202. The core package packaging space 201 and the gas storage space 202 of the present embodiment are connected by a PP tube 4 passing through one of the seals to keep the two spaces connected. In this way, the gas generated during pressurized high-temperature curing and pre-charging formation can enter the gas storage space 202 through the PP tube 4, and the overflowed gel electrolyte is kept below the seal, which effectively avoids the overflow of the gel electrolyte and further avoids the gel electrolyte remaining at the final seal.

[0048] Preferably, the size of the aluminum-plastic film 2 of this embodiment is larger than the size of the core package body 1, and when the core package body 1 is placed on two layers of aluminum-plastic film 2, the surroundings of the aluminum-plastic film 2 partially extend to the outside of the core package body 1;

[0049] The core package body 1 is arranged near the lower end of the aluminum-plastic film 2 , and the tabs 101 at both ends of the core package body 1 extend to the outside of the aluminum-plastic film 2 .

[0050] First, the multiple seals of this embodiment include:

[0051] Two symmetrical heat seals, namely a first heat seal 301 and a second heat seal 302;

[0052] The first heat seal 301 and the second heat seal 302 are both formed at the two ends of the aluminum-plastic film 2 by heat-sealing and fusing the two edges of the two layers of the aluminum-plastic film 2 in the length direction.

[0053] In addition, the multiple seals of this embodiment also include:

[0054] Two pre-seals, namely a first pre-seal 303 and a second pre-seal 304;

[0055] The first pre-seal 303 and the second pre-seal 304 are both formed at corresponding positions of the aluminum-plastic film 2 by heat sealing;

[0056] The first pre-seal 303 and the second pre-seal 304 extend along the length direction of the aluminum-plastic film 2;

[0057] The first pre-seal 303 is disposed close to the core package body 1 , and the second pre-seal 304 is disposed close to the edge of the aluminum-plastic film 2 .

[0058] Based on the formation positions of the two heat seals and the two pre-seals described above, the space enclosed between the two heat seals and the two pre-seals of this embodiment is the gas storage space 202;

[0059] The PP tube 4 passes through the first pre-seal 303 to form a structure in which one end extends into the core package packaging space 201 and the other end extends into the gas storage space 202 .

[0060] A cutting section 5 is formed along the first pre-seal 303 away from the core package body 1;

[0061] After vacuum degassing, the upper structure of the aluminum-plastic film 2 and the upper section of the PP tube 4 are cut off along the cutting section 5;

[0062] The cut PP tube 4 is welded to the inner wall of the PP tube 4 by pressurized heat sealing to form a final seal 6 .

[0063] The packaging steps of the soft-pack semi-solid lithium-ion battery of this embodiment specifically include:

[0064] First, the core package body 1 after welding the pole ear 101 is placed between the double-layer aluminum-plastic film 2 after the pitting, and the four sides of the double-layer aluminum-plastic film 2 are aligned. The size of the core package body 1 of this embodiment is not less than 60mm in width and not less than 250mm in length. The double-layer aluminum-plastic film 2 is heat-sealed and welded to form a first heat seal 301 and a second heat seal 302 with a width greater than 5mm, wherein the length of the heat seal covers the edge of the aluminum-plastic film 2, and the core package is encapsulated in the aluminum-plastic film 2. Then, liquid electrolyte is injected, and a PP tube 4 with an inner diameter of 1mm to 3mm, an outer diameter of 2mm to 5mm, and a length greater than 7mm is placed in the first pre-seal position of the double-layer aluminum-plastic film 2, and heat-sealed to form a first pre-seal 303 with a width of not less than 5mm. At this time, the PP tube 4 forms a through channel at the first pre-seal 303.

[0065] Subsequently, the double-layer aluminum-plastic film 2 is heat-sealed and welded to form a second pre-seal 304 with a width of not less than 5 mm. The two ends of the second pre-seal 304 overlap with the first heat seal 301 and the second heat seal 302 to form the above-mentioned gas storage space 202, completing the cell packaging.

[0066] Then, it is pressurized and cured at high temperature and pre-charged. The gas generated during this period enters the air bag through the PP tube 4, and the overflowed gel electrolyte is below the pre-seal; vacuum degassing, the aluminum-plastic film 2 and the excess PP tube 4 of the gas storage space 202 are cut off along the cutting section 6, and the inner wall of the PP tube 4 is welded by pressurized heat sealing to close the PP tube 4, forming a final seal 6 with the same width as the pre-seal and 2 mm wider than the outer diameter of the PP tube 4.

[0067] In the above technical solution, the soft-pack semi-solid lithium-ion battery packaging structure provided by the utility model has the following beneficial effects:

[0068] The packaging structure of the present invention forms a gas storage space 202 through two heat seals and two pre-seals for exhausting gas and ensuring that gel electrolyte does not remain at the final seal through the arrangement of the pre-seal and the PP tube 4, thereby solving the problem of final seal leakage caused by residual gel electrolyte.

[0069] Since the packaging structure of the utility model retains the air bag structure, the method is also suitable for batteries with large gas production. The process method can be realized by manual operation and batch operation of automated equipment.

[0070] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A soft-pack semi-solid lithium-ion battery packaging structure, characterized in that: The package structure includes: A double-layer aluminum-plastic film (2), the double-layer aluminum-plastic film (2) is coated on the outer side of the core package body (1); and forming a plurality of seals on the double-layer aluminum-plastic film (2) by heat sealing; The space between the double-layer aluminum-plastic film (2) is divided into a core package packaging space (201) and a gas storage space (202) by a plurality of seals; The core package packaging space (201) and the gas storage space (202) are connected via a PP tube (4), and the gas generated in the core package packaging space (201) is discharged into the gas storage space (202) via the PP tube (4); The overflowing gel electrolyte generated by the pressurized and high-temperature solidification of the liquid electrolyte in the core package packaging space (201) is blocked in the core package packaging space (201) through the corresponding seal.

2. The soft-package semi-solid lithium-ion battery packaging structure according to claim 1, characterized in that: The size of the aluminum-plastic film (2) is larger than the size of the core package body (1), and when the core package body (1) is placed on two layers of the aluminum-plastic film (2), the four sides of the aluminum-plastic film (2) partially extend to the outside of the core package body (1); The core package body (1) is arranged at a position close to the lower end of the aluminum-plastic film (2), and the tabs (101) at both ends of the core package body (1) partially extend to the outside of the aluminum-plastic film (2).

3. A soft-package semi-solid lithium-ion battery packaging structure according to claim 2, characterized in that: The plurality of said seals include: Two symmetrical heat seals, namely a first heat seal (301) and a second heat seal (302); The first heat seal (301) and the second heat seal (302) are both formed at the two ends of the aluminum-plastic film (2) by heat-sealing and fusing the two edges of the two layers of the aluminum-plastic film (2) in the length direction.

4. The soft-package semi-solid lithium-ion battery packaging structure according to claim 3, characterized in that: The seals also include: Two pre-seals, namely a first pre-seal (303) and a second pre-seal (304); The first pre-seal (303) and the second pre-seal (304) are both formed at corresponding positions of the aluminum-plastic film (2) by heat sealing; The first pre-seal (303) and the second pre-seal (304) extend along the length direction of the aluminum-plastic film (2); The first pre-seal (303) is arranged close to the core package body (1), and the second pre-seal (304) is arranged close to the edge of the aluminum-plastic film (2).

5. The soft-package semi-solid lithium-ion battery packaging structure according to claim 4, characterized in that: The space enclosed between the two heat seals and the two pre-seals is the gas storage space (202); The PP tube (4) passes through the first pre-seal (303) to form a structure in which one end extends into the core package packaging space (201) and the other end extends into the gas storage space (202).

6. The soft-package semi-solid lithium-ion battery packaging structure according to claim 5, characterized in that: A cutting section (5) is formed along a side of the first pre-seal (303) away from the core package body (1); After vacuum degassing, the upper structure of the aluminum-plastic film (2) and the upper section of the PP tube (4) are sheared off along the cutting section (5); The sheared PP tube (4) is welded to the inner wall of the PP tube (4) by pressurized heat sealing to form a final seal (6).

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