Heat insulation aluminum plastic film for solid-state battery

Abstract

The utility model discloses a heat-insulating aluminum-plastic film for a solid-state battery, which comprises an aluminum foil layer clamped between a wear-resistant protective layer and a heat-sealing layer; the heat insulation layer is clamped between the wear-resistant protection layer and the aluminum foil layer; the first buffer layers are arranged on the two sides of the heat insulation layer respectively and clamped between the wear-resistant protection layer and the aluminum foil layer. The heat-insulating aluminum-plastic film for the solid-state battery is reasonable in structure, the influence of external temperature fluctuation on the battery performance is reduced through the heat-insulating layer, the battery is protected against overheating damage, and the service life of the battery is prolonged; by means of the first buffer layers arranged on the two sides of the heat insulation layer respectively, internal pressure can be resisted without breakage or deformation, good flexibility and recovery capacity can be kept through multiple folding and unfolding operations, and the problems that the heat insulation layer causes physical damage to the aluminum plastic film and is poor in toughness are solved.

Description

Technical Field

[0001] This utility model relates to the field of battery packaging technology, and in particular to a heat-insulating aluminum-plastic film for solid-state batteries. Background Technology

[0002] Solid-state batteries require aluminum-plastic films with extremely high barrier properties and puncture resistance to ensure battery safety, reliability, and long lifespan. Unlike liquid batteries, solid-state batteries typically operate over a higher temperature range and have higher requirements for mechanical strength and chemical stability. Existing aluminum-plastic films for solid-state batteries lack thermal insulation properties, making the battery susceptible to temperature-related disturbances, and also have relatively poor overall strength, making them prone to tearing.

[0003] Therefore, it is necessary to improve the heat-insulating aluminum-plastic film for solid-state batteries in the existing technology. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a heat-insulating aluminum-plastic film for solid-state batteries. The heat insulation layer reduces the impact of external temperature fluctuations on battery performance, protects the battery from overheating damage, and helps extend battery life. The first buffer layer, which is set on both sides of the heat insulation layer, can resist internal pressure without cracking or deformation. After multiple folding and unfolding operations, it can also maintain good flexibility and recovery ability, thus improving the problem of physical damage and poor toughness of the aluminum-plastic film caused by the heat insulation layer.

[0005] To achieve the above-mentioned technical effects, the technical solution of this utility model is: a heat-insulating aluminum-plastic film for solid-state batteries, comprising:

[0006] An aluminum foil layer is sandwiched between a wear-resistant protective layer and a heat-sealing layer;

[0007] It also includes: a heat insulation layer sandwiched between the wear-resistant protective layer and the aluminum foil layer;

[0008] The first buffer layer is disposed on both sides of the heat insulation layer and sandwiched between the wear-resistant protective layer and the aluminum foil layer.

[0009] The preferred technical solution is that the material of the heat insulation layer is one of clay clinker, alumina powder, silica powder, and chromium sand.

[0010] The preferred technical solution is that the first buffer layer is a low-density polyethylene foam film.

[0011] A preferred technical solution is that the wear-resistant protective layer is a composite layer of a nylon layer and a polyethylene terephthalate layer, wherein the nylon layer is the surface layer.

[0012] A preferred technical solution is that a second buffer layer is provided between the aluminum foil layer and the heat-sealing layer, and the second buffer layer is one or more composite layers of CPP porous buffer film and low-density polyethylene foam film.

[0013] A preferred technical solution is that the heat-sealing layer is a polypropylene film.

[0014] A preferred technical solution is that both the first buffer layer and the second buffer layer are connected to the aluminum foil layer through an adhesive layer, wherein the adhesive layer is made of urethane adhesive.

[0015] The preferred technical solution is that the thickness of the aluminum foil layer is 25-50 μm, the thickness of the wear-resistant protective layer is 30-40 μm, the thickness of the first buffer layer is 15-30 μm, and the thickness of the heat insulation layer is 5-10 μm.

[0016] A preferred technical solution is that the thickness of the second buffer layer is 20-35 μm, and the thickness of the heat-sealing layer is 20-40 μm.

[0017] The advantages and beneficial effects of this utility model are as follows:

[0018] The solid-state battery uses a reasonably structured heat-insulating aluminum-plastic film. The heat insulation layer reduces the impact of external temperature fluctuations on battery performance, protects the battery from overheating damage, and helps extend battery life. The first buffer layer, located on both sides of the heat insulation layer, can resist internal pressure without cracking or deformation. Even after multiple folding and unfolding operations, it can maintain good flexibility and resilience, thus improving the problem of physical damage and poor toughness caused by the heat insulation layer to the aluminum-plastic film. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the heat-insulating aluminum-plastic film for solid-state batteries of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the heat-insulating aluminum-plastic film for solid-state batteries of this utility model.

[0021] In the diagram: 1. Aluminum foil layer; 2. Wear-resistant protective layer; 3. Heat-sealing layer; 4. Heat insulation layer; 10. Adhesive layer; 21. Nylon layer; 22. Polyethylene terephthalate layer; 51. First buffer layer; 52. Second buffer layer. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] The term "surface layer" is used with reference to the normal operating state of the heat-insulating aluminum-plastic film for solid-state batteries. It is used only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] The heat-insulating aluminum-plastic film for solid-state batteries disclosed in this utility model includes an aluminum foil layer 1, a wear-resistant protective layer 2, and a heat-sealing layer 3. The aluminum foil layer 1 is sandwiched between the wear-resistant protective layer 2 and the heat-sealing layer 3. It also includes a heat-insulating layer 4 and a first buffer layer 51 sandwiched between the wear-resistant protective layer 2 and the aluminum foil layer 1. The first buffer layer 51 is disposed on both sides of the heat-insulating layer 4.

[0026] The heat insulation layer 4 reduces the impact of external temperature fluctuations on battery performance, protects the battery from overheating damage, and helps extend battery life. The first buffer layer 51, which is set on both sides of the heat insulation layer 4, can resist internal pressure without cracking or deformation. After multiple folding and unfolding operations, it can also maintain good flexibility and recovery ability, thus improving the problem of physical damage and poor toughness of the heat insulation layer to the aluminum-plastic film.

[0027] The insulation layer 4 is made of one of the following materials: clay clinker, alumina powder, silica powder, or chromite sand. The first buffer layer 51 is a low-density polyethylene foam film. Further, the insulation layer 4 is made of clay clinker and silica powder. Clay clinker is a commonly used refractory material that effectively blocks heat conduction; it is low in cost and readily available; and it remains stable at high temperatures. Silica powder also has low thermal conductivity, helping to reduce heat loss; it has good resistance to acidic and alkaline environments; natural silica is widely available and relatively inexpensive. Low-density polyethylene (LDPE) foam film is very soft due to its low density, providing good cushioning; it can recover its original shape even after multiple compressions, making it suitable for applications requiring repeated pressure; LDPE foam is low in cost and easy to mass-produce.

[0028] The wear-resistant protective layer 2 is a composite layer of nylon layer 21 and polyethylene terephthalate layer 22, with nylon layer 21 serving as the surface layer. Nylon (PA) possesses excellent tensile and impact strength, providing good compressive protection; its smooth surface and moderate hardness make it ideal for use as a wear-resistant layer; it maintains a certain degree of flexibility and elasticity even at low temperatures, helping to absorb external impacts; and it exhibits good resistance to various solvents and electrolytes. The polyethylene terephthalate (PET) layer maintains stable physical dimensions over a wide temperature range and is not easily deformed; compared to nylon, PET has a higher Young's modulus, meaning it is harder and can increase the overall structural rigidity.

[0029] A second buffer layer 52 is disposed between the aluminum foil layer 1 and the heat-sealing layer 3. The second buffer layer 52 is one or more composite layers of CPP porous buffer film and low-density polyethylene foam film. It can effectively disperse pressure when subjected to external impact, protect the internal contents from damage, and help absorb the stress caused by volume changes during charging and discharging.

[0030] The heat-sealing layer 3 is a polypropylene film. Polypropylene film (CPP) has a wide heat-sealing temperature range, which means it can achieve reliable sealing under different temperature conditions, which is important for the production and assembly processes of different types of batteries; CPP can achieve effective heat sealing at relatively low temperatures, which helps to reduce the impact on other layer materials and can reduce production costs.

[0031] Both the first buffer layer 51 and the second buffer layer 52 are connected to the aluminum foil layer 1 via an adhesive layer 10, which is made of urethane adhesive. Urethane adhesive possesses a certain degree of flexibility and elasticity, allowing it to withstand a certain degree of bending, stretching, or compression without compromising the bonding effect. This is particularly important for solid-state batteries that require frequent charging and discharging and may undergo volume changes. Over a wide temperature range, urethane adhesive maintains its elasticity and bonding properties, making it suitable for various working environments. Urethane adhesive exhibits good resistance to many organic solvents, acid and alkali solutions, and electrolyte components, making it difficult to dissolve or corrode, ensuring long-term reliability. The adhesive layer formed by urethane adhesive effectively prevents the permeation of moisture, oxygen, and other gases, protecting internal components from external factors. Improving the overall structural airtightness helps build a more complete barrier, reduces the risk of delamination, and enhances the overall protective capability of the aluminum-plastic film.

[0032] The aluminum foil layer 1 has a thickness of 25–50 μm, the wear-resistant protective layer 2 has a thickness of 30–40 μm, the first buffer layer 51 has a thickness of 15–30 μm, the heat insulation layer 4 has a thickness of 5–10 μm, the second buffer layer 52 has a thickness of 20–35 μm, and the heat-sealing layer 3 has a thickness of 20–40 μm.

[0033] Example 1

[0034] like Figure 1 As shown, the heat-insulating aluminum-plastic film for solid-state batteries in Example 1 includes an aluminum foil layer 1, a wear-resistant protective layer 2, and a heat-sealing layer 3. The aluminum foil layer 1 is sandwiched between the wear-resistant protective layer 2 and the heat-sealing layer 3. It also includes a heat-insulating layer 4 and a first buffer layer 51 sandwiched between the wear-resistant protective layer 2 and the aluminum foil layer 1. The first buffer layer 51 is located on both sides of the heat-insulating layer 4. A second buffer layer 52 is disposed between the aluminum foil layer 1 and the heat-sealing layer 3. The second buffer layer 52 is a CPP porous buffer film. Both the first buffer layer 51 and the second buffer layer 52 are connected to the aluminum foil layer 1 through an adhesive layer 10. The wear-resistant protective layer 2 is a nylon layer 21.

[0035] Example 2

[0036] like Figure 2 As shown, Example 2 is based on Example 1, except that the wear-resistant protective layer 2 is a composite layer of nylon layer 21 and polyethylene terephthalate layer 22, with nylon layer 21 being the surface layer. The aluminum-plastic film of Example 2 has superior mechanical strength compared to that of Example 1.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A heat-insulating aluminum plastic film for solid-state batteries, comprising: an aluminum foil layer sandwiched between a wear-resistant protective layer and a heat-sealing layer; characterized in that it further comprises: a heat-insulating layer sandwiched between the wear-resistant protective layer and the aluminum foil layer; a first buffer layer separately arranged on both sides of the heat-insulating layer and sandwiched between the wear-resistant protective layer and the aluminum foil layer.

2. The heat-shielding aluminum laminate film for solid-state batteries according to claim 1, characterized by, The material of the heat-insulating layer is one of clay clinker, aluminum oxide powder, silica powder, and chrome sand.

3. The heat-shielding aluminum laminate film for solid-state batteries according to claim 2, characterized by The first buffer layer is a low-density polyethylene foam film.

4. The heat-shielding aluminum laminate film for solid-state batteries according to claim 1 or 2, characterized by, The wear-resistant protective layer is a composite layer of a nylon layer and a polyethylene terephthalate layer, and the nylon layer is a surface layer.

5. The heat-shielding Al-PET film for solid-state batteries according to claim 3, characterized by, A second buffer layer is arranged between the aluminum foil layer and the heat-sealing layer, and the second buffer layer is one or a composite layer of multiple layers of CPP porous buffer film and low-density polyethylene foam film.

6. The heat-shielding aluminum laminate film for solid-state batteries according to claim 1 or 5, characterized by, The heat-sealing layer is a polypropylene film.

7. The heat-shielding aluminum laminate film for solid-state batteries according to claim 5, characterized by Both the first buffer layer and the second buffer layer are connected to the aluminum foil layer through an adhesive layer, and the material of the adhesive layer is urethane adhesive.

8. The heat-shielding Al-PET film for solid-state batteries according to claim 1, characterized by, The thickness of the aluminum foil layer is 25-50 μm, the thickness of the wear-resistant protective layer is 30-40 μm, the thickness of the first buffer layer is 15-30 μm, and the thickness of the heat-insulating layer is 5-10 μm.

9. The heat-shielding aluminum laminate film for solid-state batteries according to claim 5, characterized by, The thickness of the second buffer layer is 20-35 μm, and the thickness of the heat-sealing layer is 20-40 μm.

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