Laminated body for solid-state battery

Abstract

The utility model discloses a laminated body for a solid-state battery, which sequentially comprises a protective film layer, a first adhesive layer, a metal layer and a second adhesive layer from outside to inside, the protective film layer is selected from one of a polyether-ether-ketone film, a polysulfone film and a liquid crystal polymer film, and the metal layer is a stainless steel foil or a copper foil. According to the utility model, the polyether-ether-ketone film, the polysulfone film and the liquid crystal polymer film are selected as the protective films, the stainless steel foil and the copper foil are selected as the metal layers, and the high-temperature resistance and the moisture resistance of the laminated body are effectively improved by utilizing the high melting point and the low hygroscopicity of the protective films; therefore, the use requirements of the solid-state battery are better met.

Description

Technical Field

[0001] The utility model relates to the technical field of solid-state battery packaging, in particular to a laminate for solid-state batteries. Background Art

[0002] Solid-state batteries use solid electrodes and solid electrolytes. During processing, they must be encapsulated with packaging materials to prevent leakage. This requires higher standards for packaging materials to ensure they maintain heat resistance and maintain a water vapor barrier.

[0003] At present, the aluminum-plastic film used for battery packaging on the market is made of relatively ordinary materials, has poor high temperature resistance, and has low water vapor barrier performance, making it unsuitable for use in solid-state batteries. Utility Model Content

[0004] The present invention addresses the deficiencies in the prior art and provides a laminate for a solid-state battery, which can improve the heat resistance and water vapor barrier performance of the solid-state battery.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A laminate for a solid-state battery comprises, from the outside to the inside, a protective film layer, a first adhesive layer, a metal layer and a second adhesive layer, wherein the protective film layer is selected from one of a polyetheretherketone film, a polysulfone film and a liquid crystal polymer film, and the metal layer is a stainless steel foil or a copper foil.

[0007] As a preferred technical solution, the tensile strength of the protective film layer is greater than 50 MPa, and the elongation at break is greater than 20%.

[0008] As a preferred technical solution, the melting point of the protective film layer is greater than 200°C.

[0009] As a preferred technical solution, the thickness of the protective film layer is 15 to 30 μm.

[0010] As a preferred technical solution, the thickness of the metal layer is 15 to 60 μm.

[0011] As a preferred technical solution, the first adhesive layer and the second adhesive layer are both two-component polyurethane adhesives, and the Vicat softening point of the two-component polyurethane adhesive is 200-300°C.

[0012] As a preferred technical solution, the thickness of the first adhesive layer and the second adhesive layer are both 3 to 5 μm.

[0013] As a preferred technical solution, the stainless steel foil has a tensile strength of 200 to 500 MPa and an elongation at break of 12 to 40%.

[0014] As a preferred technical solution, the model of the stainless steel foil is SU304 or SU316.

[0015] As a preferred technical solution, the tensile strength of the copper foil is 200-500 MPa, and the elongation at break is 12-40%.

[0016] Compared with the existing technology, the present invention has obvious advantages and beneficial effects. Specifically, by selecting polyetheretherketone film, polysulfone film and liquid crystal polymer film as protective films, and selecting stainless steel foil and copper foil as metal layers, the high temperature resistance and moisture resistance of the laminate are effectively improved, thereby better meeting the use requirements of solid-state batteries.

[0017] In order to more clearly illustrate the structural features, technical means and specific purposes and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present utility model.

[0019] Description of the accompanying drawings:

[0020] 10. Protective film layer; 20. First adhesive layer;

[0021] 30. Metal layer; 40. Second adhesive layer. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0024] like Figure 1As shown, a laminate for solid-state batteries includes, from the outside to the inside, a protective film layer 10, a first adhesive layer 20, a metal layer 30 and a second adhesive layer 40, wherein the protective film layer 10 is selected from one of polyetheretherketone film, polysulfone film and liquid crystal polymer film, and the metal layer 30 is stainless steel foil or copper foil.

[0025] In the present invention, the thickness of the protective film layer 10 is 15-30 μm, the thickness of the metal layer 30 is 15-60 μm, and the thickness of the first adhesive layer 20 and the second adhesive layer 40 are both 3-5 μm.

[0026] Specifically, the melting point of the protective film layer 10 is greater than 200° C. The tensile strength of the protective film layer 10 is greater than 50 MPa, and the elongation at break is greater than 20%, preferably, the elongation at break is greater than 30%.

[0027] The first adhesive layer 20 and the second adhesive layer 40 are both two-component polyurethane adhesives, and the Vicat softening point of the two-component polyurethane adhesive is 200-300° C. The use of the two-component polyurethane with a high softening point ensures the bonding effect of the laminate at high temperatures.

[0028] The tensile strength of the stainless steel foil is 200-500 MPa, and the elongation at break is 12-40%. The model of the stainless steel foil is SU304 or SU316.

[0029] The tensile strength of the copper foil is 200-500 MPa, and the elongation at break is 12-40%.

[0030] In summary, the present invention selects polyetheretherketone film, polysulfone film and liquid crystal polymer film as protective film, and selects stainless steel foil and copper foil as metal layer 30, and utilizes the high melting point and low hygroscopicity of the protective film to effectively improve the high temperature resistance and moisture resistance of the stack, thereby better meeting the use requirements of solid-state batteries.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical practice of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A laminate for a solid-state battery, characterized in that: From outside to inside, it includes a protective film layer, a first adhesive layer, a metal layer and a second adhesive layer. The protective film layer is selected from one of polyetheretherketone film, polysulfone film and liquid crystal polymer film. The metal layer is stainless steel foil or copper foil.

2. A solid-state battery laminate according to claim 1, characterized in that: The tensile strength of the protective film layer is greater than 50 MPa, and the elongation at break is greater than 20%.

3. The solid-state battery stack according to claim 1, wherein: The melting point of the protective film layer is greater than 200°C.

4. The solid-state battery stack according to claim 1, wherein: The thickness of the protective film layer is 15 to 30 μm.

5. The solid-state battery stack according to claim 1, wherein: The thickness of the metal layer is 15 to 60 μm.

6. The solid-state battery stack according to claim 1, wherein: The first adhesive layer and the second adhesive layer are both two-component polyurethane adhesives, and the Vicat softening point of the two-component polyurethane adhesive is 200-300°C.

7. The solid-state battery stack according to claim 1, wherein: The thickness of the first adhesive layer and the second adhesive layer are both 3 to 5 μm.

8. The solid-state battery stack according to claim 1, wherein: The tensile strength of the stainless steel foil is 200-500 MPa, and the elongation at break is 12-40%.

9. The solid-state battery stack according to claim 1, wherein: The model of the stainless steel foil is SU304 or SU316.

10. The solid-state battery stack according to claim 1, wherein: The tensile strength of the copper foil is 200-500 MPa, and the elongation at break is 12-40%.

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