Semi-solid soft package battery packaging structure

Abstract

The utility model relates to a packaging structure of a semi-solid soft package battery. The semi-solid soft package battery packaging structure comprises a packaging film, the packaging film comprises a pit body area used for containing a battery cell and an air bag area, the pit body area and the air bag area are distributed in the left-right direction, and an opening is formed in the side, opposite to the pit body area, of the air bag area so that electrolyte can be injected conveniently; a heat sealing area is arranged in the middle of the packaging film and located between the pit body area and the air bag area, the heat sealing area extends in the vertical direction, and a heat sealing protection layer is pasted to the heat sealing area to prevent electrolyte from contaminating the packaging film. According to the packaging structure of the semi-solid soft package battery, the heat-sealing protection layer is adhered to the heat-sealing area, so that the technical problems that the electrolyte is adhered to the surface of the aluminum-plastic film in the electrolyte injection and pressurization processes, so that the sealing is not tight and the air leakage is caused during secondary heat sealing, and the performance of the battery cell is influenced are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of flexible battery packaging, and particularly relates to a semi-solid flexible battery packaging structure. Background Art

[0002] Due to its high energy density, flexible lithium-ion batteries have been developed rapidly in recent years. The flexible lithium-ion batteries have flexible model sizes and are widely used. Currently, the application fields of flexible lithium-ion batteries mainly include 3C, power batteries, aerospace and other fields. The outer packaging of flexible lithium-ion batteries is mainly an aluminum-plastic film. The current aluminum-plastic film structure mainly includes three layers. The outermost layer is made of nylon material, which can prevent the battery from being damaged by external forces and play a role in protecting the battery. The middle layer is aluminum foil, which plays a role in separating air and preventing electrolyte leakage. The inner layer material is generally polyethylene or polypropylene material, which melts and bonds at a specific temperature and pressure to play a role in sealing and bonding. The packaging effect of the battery core can directly affect its safety and service life.

[0003] In recent years, with the rapid development of the in-situ curing technology of semi-solid batteries, there have also been corresponding problems of poor packaging in the packaging of semi-solid flexible batteries. The main reasons include two points: ① When injecting the electrolyte, a small amount of electrolyte contaminates the sealing area. Subsequently, the electrolyte containing monomers solidifies and affects the melting and pressing of the inner layer material of the aluminum-plastic film; ② During the curing and pre-charging process, in order to improve the subsequent performance of the battery core, an appropriate pressure is usually applied to the battery core, resulting in the overflow of the surplus electrolyte, which also contaminates the second sealing area and solidifies. The invention patent with the application publication number of CN114551971A discloses a flexible battery thermal packaging method. The flexible battery thermal packaging method realizes liquid injection and exhaust by setting channels at the preheated sealing area. However, this flexible battery thermal packaging method only reduces the area of the aluminum-plastic film contaminated by the electrolyte and does not solve the adverse packaging effects brought by the electrolyte contaminating the aluminum-plastic film at the sealing channel. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a semi-solid flexible battery packaging structure to solve the technical problem that the electrolyte contaminates the aluminum-plastic film during the packaging of flexible batteries.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A semi-solid flexible battery packaging structure includes a packaging film. The packaging film includes a pit area for accommodating the battery core and an airbag area. The pit area and the airbag area are distributed in the left-right direction. One side of the airbag area opposite to the pit area is open for injecting the electrolyte; a heat-sealing area is arranged in the middle of the packaging film. The heat-sealing area is located between the pit area and the airbag area. The heat-sealing area extends in the up-down direction, and a heat-sealing protective layer is pasted on the heat-sealing area to prevent the electrolyte from contaminating the packaging film.

[0007] Further, heat-sealing areas are provided on both the front and rear sides of the packaging film, and heat-sealing protection layers are pasted on the inner walls of the front and rear sides of the packaging film.

[0008] Further, heat-sealing is performed on the heat-sealing areas located on the front and rear sides of the packaging film, and a plurality of heat-sealing protection channels for communicating the pit area and the airbag area are provided in the heat-sealing areas for injecting electrolyte.

[0009] Further, the heat-sealing protection layer extends along the inner wall of the packaging film, and the heat-sealing protection layer is located at the heat-sealing protection channel.

[0010] Further, the thickness of the heat-sealing protection layer is 10 - 30 μm.

[0011] Further, the width of the heat-sealing protection layer is 0.5 - 2 cm wider than the width of the heat-sealing area.

[0012] Further, the alignment deviation of the heat-sealing protection layers on the inner walls of the front and rear sides of the packaging film does not exceed 1 mm.

[0013] Further, the material of the heat-sealing protection layer is a thermoplastic plastic with adhesiveness.

[0014] Further, the material of the heat-sealing protection layer is one of polypropylene, polyvinyl chloride, polyethylene terephthalate, polyimide, polyethylene, polytetrafluoroethylene, and carbonate polyester.

[0015] Advantages of the present utility model:

[0016] In the semi-solid soft-pack battery encapsulation structure of the present utility model, by pasting a heat-sealing protection layer in the heat-sealing area, it is avoided that the electrolyte contaminates the surface of the aluminum-plastic film during the injection of electrolyte and the pressurization process, and thus problems such as poor sealing, air leakage, and affecting the performance of the battery core during secondary heat-sealing do not occur. Description of the drawings

[0017] Figure 1 It is a cross-sectional view of the semi-solid soft-pack battery encapsulation structure in Embodiment 1;

[0018] Figure 2 It is a developed view of the semi-solid soft-pack battery encapsulation structure in Embodiment 1;

[0019] Figure 3 It is a structural diagram of the heat-sealing area of the semi-solid soft-pack battery encapsulation structure in Embodiment 1.

[0020] In the figure: 1, packaging film; 2, heat-sealing protection channel; 3, airbag area; 4, heat-sealing area; 5, battery core; 6, heat-sealing protection layer. Specific embodiments

[0021] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0022] An embodiment of the semi-solid soft-pack battery packaging structure in the present utility model is as Figures 1-3 shown.

[0023] Embodiment 1

[0024] The semi-solid soft-pack battery packaging structure of this embodiment includes a packaging film 1, which is formed by folding an aluminum-plastic film in half and then heat-sealing the upper and lower sides of the aluminum-plastic film. The packaging film 1 includes a pit area (not shown in the figure) for accommodating the battery cell 5 and an airbag area 3. The pit area and the airbag area 3 are distributed in the left-right direction. One side of the airbag area 3 opposite to the pit area is open for injecting electrolyte. A heat-sealing area 4 is provided in the middle of the packaging film 1. The heat-sealing area 4 is located between the pit area and the airbag area 3 and extends in the up-down direction. A heat-sealing protective layer 6 is pasted on the heat-sealing area 4 to prevent the electrolyte from contaminating the packaging film 1. Heat-sealing areas 4 are provided inside the front and rear sides of the packaging film 1, and heat-sealing protective layers 6 are pasted on the front and rear inner walls of the packaging film 1. The thickness of the heat-sealing protective layer 6 is 15 μm. The width of the heat-sealing protective layer 6 is 1 cm wider than the width of the heat-sealing area 4. The alignment deviation of the heat-sealing protective layers 6 on the front and rear inner walls of the packaging film 1 does not exceed 1 mm. The material of the heat-sealing protective layer 6 is a thermoplastic plastic with adhesiveness, and the material of the heat-sealing protective layer 6 is polyimide. The heat-sealing areas 4 inside the front and rear sides of the packaging film 1 are heat-sealed. A heat-sealing protection channel 2 for communicating the pit area and the airbag area 3 is provided in the heat-sealing area 4 for injecting electrolyte, and the heat-sealing protective layer 6 is located at the heat-sealing protection channel 2.

[0025] Embodiment 2

[0026] The semi-solid soft-pack battery packaging structure described in this embodiment has a general structure consistent with that of Embodiment 1, but the difference from Embodiment 1 is that the material of the heat-sealing protective layer is polyvinyl chloride.

[0027] When the semi-solid soft-pack battery packaging structure is encapsulated, first place the battery cell in the pit area, and the battery cell and the ear glue part protrude from the packaging film. Paste the heat-sealing protective layer on the front and rear inner walls of the heat-sealing area of the packaging film, heat-seal the heat-sealing area to obtain a heat-sealing protection channel; inject electrolyte from the open side of the airbag area, heat-seal the side of the airbag area opposite to the pit area, perform high-temperature curing and pre-charging on the battery cell, then cut off the airbag area, remove the heat-sealing protective layer, and heat-seal the heat-sealing protection channel.

[0028] Finally, it should be noted that: in the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A semi-solid soft-pack battery packaging structure, comprising a packaging film, the packaging film including a pit area for accommodating an electric core and an air bag area, the pit area and the air bag area being distributed in the left-right direction, and one side of the air bag area opposite to the pit area being open for injecting electrolyte; characterized in that: A heat-sealing area is provided in the middle of the packaging film. The heat-sealing area is located between the pit area and the airbag area. The heat-sealing area extends in the up and down direction, and a heat-sealing protection layer is pasted on the heat-sealing area to prevent the electrolyte from contaminating the packaging film.

2. The semi-solid soft-pack battery encapsulation structure according to claim 1, characterized in that: The heat-sealing area is provided on both the front and back sides of the packaging film, and the heat-sealing protection layers are pasted on the front and back inner walls of the packaging film.

3. The semi-solid soft-pack battery encapsulation structure according to claim 2, wherein: The heat-sealing areas on the front and back sides of the packaging film are heat-sealed. The heat-sealing area is provided with a number of heat-sealing protection channels for connecting the pit area and the airbag area for injecting the electrolyte.

4. The semi-solid soft-pack battery encapsulation structure according to claim 3, wherein: The heat-sealing protection layer extends along the inner wall of the packaging film, and the heat-sealing protection layer is located at the heat-sealing protection channel.

5. The semi-solid flexible package battery encapsulation structure according to claim 1, characterized in that: The thickness of the heat-sealing protection layer is 10-30 μm.

6. The semi-solid flexible battery packaging structure according to claim 1, wherein: The width of the heat-sealing protection layer is 0.5-2 cm wider than the width of the heat-sealing area.

7. The semi-solid soft-pack battery encapsulation structure according to claim 1, wherein: The alignment deviation of the heat-sealing protection layers on the front and back inner walls of the packaging film does not exceed 1 mm.

8. The semi-solid soft-pack battery encapsulation structure according to claim 1, wherein: The material of the heat-sealing protection layer is an adhesive thermoplastic plastic.

9. The semi-solid flexible battery packaging structure according to claim 8, characterized in that: The material of the heat-sealing protection layer is one of polypropylene, polyvinyl chloride, polyethylene terephthalate, polyimide, polyethylene, polytetrafluoroethylene, and carbonate polyester.

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