A solid-state battery packaging structure

Abstract

This utility model relates to the field of solid-state battery packaging technology and discloses a solid-state battery packaging structure, including a packaging shell, a top cover welded to the top of the packaging shell, a butyl rubber sealant layer coated on the outside of the weld between the top cover and the packaging shell, a solid-state battery cell fixedly installed inside the packaging shell, graphite composite gaskets fixed to the bottom and four sides of the inner side of the packaging shell, the graphite composite gaskets contacting the solid-state battery cell, thermally conductive gel filling the gap between the solid-state battery cell and the inner wall of the packaging shell, and a busbar provided on the top of the solid-state battery cell. This utility model has good sealing performance; the graphene coating on the inner wall of the shell conducts heat, the honeycomb holes on the outer side increase the heat exchange area, and the airflow guide groove at the bottom guides air dissipation, which, together with the graphite composite gaskets and thermally conductive gel, greatly improves the heat conduction and dissipation efficiency; the composite explosion-proof film on the top cover can burst and release pressure in the event of thermal runaway, preventing the shell from exploding, thus improving safety.

Description

Technical Field

[0001] This utility model relates to the field of solid-state battery packaging technology, and in particular to a solid-state battery packaging structure. Background Technology

[0002] In the development of solid-state battery technology, the sealing and heat dissipation performance of the packaging structure are the core bottlenecks that restrict its reliability, safety and service life. On the one hand, solid-state batteries have extremely high requirements for isolation from the external environment. Traditional packaging often suffers from problems such as micropores in the weld between the top cover and the outer shell, insufficient sealing between the terminals and the top cover, and sealing defects at the edges of explosion-proof components. This allows external moisture and oxygen to penetrate into the cell, which not only easily reacts with the solid electrolyte, damaging the interface stability, but also causes rapid capacity decay of the cell, seriously affecting battery performance. On the other hand, solid-state batteries continuously generate heat during charging and discharging. Traditional packaging shells are mostly smooth structures with limited heat exchange area. Furthermore, air gaps or poor compatibility of thermal conductive media between the cell and the shell can prevent efficient heat transfer and dissipation. Localized high temperatures can not only accelerate the aging of packaging materials but may also induce the risk of thermal runaway. Therefore, in view of the above situation, there is an urgent need to develop a solid-state battery packaging structure with good sealing performance, a graphene coating on the inner wall of the shell to conduct heat, honeycomb holes on the outer side to increase the heat exchange area, and airflow guide grooves at the bottom to guide air dissipation. Combined with graphite composite gaskets and thermal conductive gel, this structure can significantly improve the efficiency of heat conduction and dissipation, overcome the shortcomings in current practical applications, and meet current needs. Utility Model Content

[0003] The purpose of this invention is to provide a solid-state battery packaging structure to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A solid-state battery packaging structure includes a packaging shell, a top cover, terminals, a solid-state battery cell, graphite composite gaskets, and thermally conductive gel. The top cover is welded to the top of the packaging shell. The weld between the top cover and the packaging shell is coated with a butyl rubber sealant layer. The outer wall of the packaging shell has a honeycomb structure. The bottom of the packaging shell has an airflow guide groove. The inner wall of the packaging shell has a graphene coating. The solid-state battery cell is fixedly installed inside the packaging shell. Graphite composite gaskets are fixed to the bottom and four sides of the inner wall of the packaging shell, and the graphite composite gaskets are in contact with the solid-state battery cell. The gap between the solid-state battery cell and the inner wall of the packaging shell is filled with thermally conductive gel. A busbar is provided on the top of the solid-state battery cell. Two terminals are fixed on the top cover, penetrating the terminal. The terminals are electrically connected to the busbar. A high-temperature resistant epoxy resin sealing ring is fixed to the outer side of the terminal. A polytetrafluoroethylene (PTFE) sealing ring is fixed to the outer side of the high-temperature resistant epoxy resin sealing ring. The PTFE sealing ring is fixed to the top cover.

[0005] Preferably, the outer casing and top cover are both made of aluminum alloy.

[0006] Preferably, the top cover is provided with an explosion-proof hole, and a composite explosion-proof membrane is fixed inside the explosion-proof hole.

[0007] Preferably, an adhesive seal is attached to the edge of the composite explosion-proof film where it contacts the explosion-proof hole.

[0008] Preferably, the composite explosion-proof film is composed of aluminum foil and PE film, with the aluminum foil located on the upper side of the PE film.

[0009] The beneficial effects of this utility model are as follows: In use, the solid-state battery encapsulation structure fills the tiny pores in the weld seam with a butyl rubber sealing layer, improving the sealing reliability between the top cover and the encapsulation shell. A double-sealing structure is formed by a high-temperature resistant epoxy resin sealing ring and a polytetrafluoroethylene sealing ring, enhancing the sealing performance between the terminal post and the top cover. The sealing ring improves the sealing performance between the composite explosion-proof film and the top cover, resulting in a good overall sealing effect. The elasticity of the graphite composite gasket provides a certain buffering and protection for the solid-state battery cell. The thermal conductivity of the graphite composite gasket allows the heat from the solid-state battery cell to be directly transferred to the encapsulation shell. The thermally conductive gel directly conducts the heat from the solid-state battery cell to the encapsulation shell, improving thermal conductivity. The graphene coating quickly dissipates the heat absorbed by the encapsulation shell to the entire shell surface, preventing localized heat accumulation and accelerating the heat transfer efficiency from inside to outside the shell. The honeycomb structure greatly increases the surface area of ​​the encapsulation shell, increasing its contact area with air and improving heat exchange efficiency. The airflow guide grooves allow air to pass through the bottom of the encapsulation shell, carrying away heat and improving the overall heat dissipation effect. In summary, this utility model has good sealing performance; the graphene coating on the inner wall of the outer shell conducts heat, the honeycomb holes on the outer side increase the heat exchange area, and the airflow guide groove at the bottom guides air dissipation. Combined with the graphite composite gasket and thermal conductive gel, the heat conduction and dissipation efficiency is greatly improved; the composite explosion-proof film on the top cover can burst and release pressure in the event of thermal runaway, avoiding the outer shell from exploding, thus ensuring higher safety. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0011] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0012] Figure 3 This is a partial structural diagram of the present invention. Figure 1 .

[0013] Figure 4This is a partial structural diagram of the present invention. Figure 2 .

[0014] Figure 5 This is a schematic diagram of the top cover in this utility model.

[0015] Legend: 1. Encapsulation shell; 101. Honeycomb structure; 102. Airflow guide groove; 103. Graphene coating; 2. Top cover; 201. Explosion-proof hole; 3. Butyl rubber sealing layer; 4. Terminal post; 401. High-temperature resistant epoxy resin sealing ring; 402. Polytetrafluoroethylene sealing ring; 5. Solid-state battery cell; 501. Busbar; 6. Graphite composite gasket; 7. Thermal conductive gel; 8. Composite explosion-proof film; 801. Sealing ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] Specific implementation examples are given below.

[0018] See Figures 1-5 In this embodiment of the present invention, a solid-state battery encapsulation structure includes an encapsulation shell 1, a top cover 2, an electrode post 4, a solid-state battery cell 5, a graphite composite gasket 6, and a thermally conductive gel 7. The encapsulation shell 1 and the top cover 2 are both made of aluminum alloy, which gives them good strength, thermal conductivity, and relatively light weight. The top cover 2 is welded to the top of the encapsulation shell 1. A layer of butyl rubber sealant 3 is coated on the outside of the weld between the top cover 2 and the encapsulation shell 1. The butyl rubber sealant 3 fills the tiny pores in the weld, thereby improving the sealing reliability between the top cover 2 and the encapsulation shell 1.

[0019] The outer wall of the encapsulation shell 1 is provided with a honeycomb structure 101, which greatly increases the surface area of ​​the encapsulation shell 1, making its contact area with air larger and improving heat exchange efficiency. The bottom of the encapsulation shell 1 is provided with an airflow guide groove 102, which allows air to pass through the bottom of the encapsulation shell 1 and carry away heat. The inner wall of the encapsulation shell 1 is provided with a graphene coating 103. The graphene coating 103 has high thermal conductivity and can quickly conduct the heat absorbed by the encapsulation shell 1 to the entire surface of the shell, avoiding local heat accumulation, accelerating the heat transfer efficiency from the inside of the shell to the outside of the shell, and improving heat dissipation.

[0020] Solid-state battery cell 5 is fixedly installed inside the encapsulation shell 1. Graphite composite gaskets 6 are fixed to the bottom and four sides of the encapsulation shell 1. The graphite composite gaskets 6 are in contact with the solid-state battery cell 5. The graphite composite gaskets 6 have good elasticity, thermal conductivity and high temperature resistance. The elasticity of the graphite composite gaskets 6 can provide a certain buffer protection for the solid-state battery cell 5. The thermal conductivity of the graphite composite gaskets 6 can directly transfer the heat of the solid-state battery cell 5 to the encapsulation shell 1. The gap between the solid-state battery cell 5 and the inner wall of the encapsulation shell 1 is filled with thermally conductive gel 7. The thermally conductive gel 7 directly conducts the heat on the solid-state battery cell 5 to the encapsulation shell 1, improving the thermal conductivity.

[0021] A busbar 501 is provided on the top of the solid-state battery cell 5. Two terminals 4 are fixed on the top cover 2 and pass through it. The terminals 4 are electrically connected to the busbar 501 and are used to connect to other external circuits. A high-temperature resistant epoxy resin sealing ring 401 is fixed on the outside of the terminal 4. A polytetrafluoroethylene (PTFE) sealing ring 402 is fixed on the outside of the high-temperature resistant epoxy resin sealing ring 401. The PTFE sealing ring 402 is fixed to the top cover 2. A double sealing structure is formed by the high-temperature resistant epoxy resin sealing ring 401 and the PTFE sealing ring 402, which improves the sealing performance of the connection between the terminal 4 and the top cover 2.

[0022] The top cover 2 is provided with an explosion-proof hole 201, and a composite explosion-proof membrane 8 is fixed inside the explosion-proof hole 201. An adhesive sealing ring 801 is adhered to the edge of the composite explosion-proof membrane 8 where it contacts the explosion-proof hole 201. The adhesive sealing ring 801 improves the sealing between the composite explosion-proof membrane 8 and the top cover 2. The composite explosion-proof membrane 8 is composed of aluminum foil and PE film, with the aluminum foil on the upper side of the PE film. When not triggered, it ensures sealing and prevents moisture from entering through the explosion-proof hole 201. When the internal pressure rises suddenly due to battery thermal runaway, the composite explosion-proof membrane 8 is ruptured, and the pressure is released from the explosion-proof hole 201, preventing the entire encapsulation shell 1 from exploding and improving safety.

[0023] Working principle: In use, this solid-state battery encapsulation structure fills the tiny pores in the weld seam with a butyl rubber sealing layer 3, improving the sealing reliability between the top cover 2 and the encapsulation shell 1. A double-sealing structure is formed by a high-temperature resistant epoxy resin sealing ring 401 and a polytetrafluoroethylene sealing ring 402, improving the sealing performance between the terminal post 4 and the top cover 2. The sealing ring 801 enhances the sealing performance between the composite explosion-proof film 8 and the top cover 2, resulting in a good overall sealing effect. The elasticity of the graphite composite gasket 6 provides a certain degree of buffering and protection for the solid-state battery cell 5, and the thermal conductivity of the graphite composite gasket 6 can further protect the solid-state battery cell 5. Heat is directly transferred to the encapsulation shell 1. The heat on the solid-state battery cell 5 is directly conducted to the encapsulation shell 1 through the thermal conductive gel 7, improving the thermal conductivity. The graphene coating 103 can quickly conduct the heat absorbed by the encapsulation shell 1 to the entire surface of the shell, avoiding local heat accumulation and accelerating the heat transfer efficiency from the inside to the outside of the shell. The honeycomb structure 101 greatly increases the surface area of ​​the encapsulation shell 1, making its contact area with air larger and improving the heat exchange efficiency. The airflow guide groove 102 allows air to pass through the bottom of the encapsulation shell 1 to carry away heat, thereby improving the overall heat dissipation effect.

[0024] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A solid-state battery packaging structure, characterized by, The application relates to a solid-state battery package, which comprises a package shell (1), a top cover (2), a pole (4), a solid-state battery core (5), a graphite composite gasket (6) and a heat-conducting gel (7), the top cover (2) is welded to the top of the package shell (1), the weld joint between the top cover (2) and the package shell (1) is coated with a butyl rubber sealing glue layer (3), the outer side wall of the package shell (1) is provided with a honeycomb hole structure (101), the bottom of the package shell (1) is provided with an air flow guide groove (102), the inner wall of the package shell (1) is provided with a graphene coating (103), the solid-state battery core (5) is fixedly installed in the package shell (1), the inner bottom end and the four side faces of the package shell (1) are respectively fixed with graphite composite gaskets (6), the graphite composite gaskets (6) are in contact with the solid-state battery core (5), the gap between the solid-state battery core (5) and the inner wall of the package shell (1) is filled with the heat-conducting gel (7), the top of the solid-state battery core (5) is provided with a busbar (501), two pole (4) penetrating through the top cover (2) are fixed to the top cover (2), the poles (4) are electrically connected with the busbar (501), the outer side of the pole (4) is fixed with a high-temperature-resistant epoxy resin sealing ring (401), the outer side of the high-temperature-resistant epoxy resin sealing ring (401) is fixed with a polytetrafluoroethylene sealing ring (402), and the polytetrafluoroethylene sealing ring (402) is fixed with the top cover (2).

2. The solid-state battery packaging structure of claim 1, wherein, The package shell (1) and the top cover (2) are made of aluminum alloy.

3. The solid-state battery packaging structure of claim 1, wherein, The top cover (2) is provided with an anti-explosion hole (201), and a composite anti-explosion film (8) is fixed in the anti-explosion hole (201).

4. The solid-state battery packaging structure of claim 3, wherein, The edge of the composite anti-explosion film (8) is adhered with a glue sealing ring (801) at the position in contact with the anti-explosion hole (201).

5. The solid-state battery packaging structure of claim 3, wherein, The composite anti-explosion film (8) is composed of an aluminum foil and a PE film, and the aluminum foil is located on the upside of the PE film.

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