Heat-sensitive plastic film and soft packaging film

Abstract

The present invention discloses a thermosensitive plastic film, comprising a plastic layer and a thermosensitive material layer made of a thermosensitive material; the number of layers of the plastic layer is n, n is a positive integer greater than or equal to 1; the number of layers of the thermosensitive material layer is 1 to n+1; and when the number of layers of the thermosensitive material layer is greater than or equal to 2, at least one layer of the plastic layer is provided between two adjacent layers of the thermosensitive material layer. The present invention also discloses a soft-pack film, comprising a metal layer, at least one side of the metal layer is composited with the thermosensitive plastic film as described above. The soft-pack film of the present invention is provided with a thermosensitive material layer, and during the heating process of the soft-pack battery, the thermosensitive material absorbs the heat generated and converts the heat generated into electrical energy, which can be supplied to the outside by drawing out from the positive and negative ears of the soft-pack battery, thereby achieving the technical purpose of increasing the battery energy.

Description

Technical Field

[0001] The invention relates to a film, in particular to a heat-sensitive plastic film and a soft-package film. Background Art

[0002] Lithium battery heating is a common phenomenon in life. It often occurs in wireless home appliances such as mobile phones and laptops that use lithium batteries as power sources. When the lithium battery is discharged, a chemical reaction will occur inside the battery, generating a large amount of heat energy, causing the battery temperature to rise. We can feel the temperature when we touch it with our hands. This is a common phenomenon in most lithium batteries.

[0003] The main hazards of heating to lithium batteries are:

[0004] 1. Long-term overheating of the battery will cause the temperature of the internal components to rise, affecting the normal operation of the components;

[0005] 2. If the battery is heated for a long time, the heat of the battery itself will increase. If it is a sealed battery, the air inside it will expand violently, causing the battery to bulge outward, and in severe cases, the battery will explode;

[0006] 3. Long-term excessive heating of the battery will accelerate the aging process of the product itself and shorten its life.

[0007] Some existing lithium batteries are packaged with soft-pack films, which generally package multiple stacked lithium batteries, so the heat generated inside is relatively large. However, the existing soft-pack films have poor heat dissipation performance, which increases the safety risks of lithium batteries packaged with soft-pack films. Summary of the invention

[0008] In view of this, the object of the present invention is to provide a heat-sensitive plastic film and a soft-pack film, which can effectively suppress excessive heating of soft-pack batteries and convert the heat generated by the batteries into usable electrical energy.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] The present invention firstly proposes a heat-sensitive plastic film, comprising a plastic layer and a heat-sensitive material layer made of a heat-sensitive material;

[0011] The number of plastic layers is n, where n is a positive integer greater than or equal to 1;

[0012] The number of layers of the heat-sensitive material layer is 1 to n+1;

[0013] When the number of the heat-sensitive material layers is greater than or equal to 2, at least one plastic layer is disposed between two adjacent heat-sensitive material layers.

[0014] Furthermore, the thermoelectric potential directions of the thermosensitive materials in the thermosensitive material layer are the same.

[0015] Furthermore, the thermosensitive material is a semiconductor thermosensitive material, a metal thermosensitive material, an alloy thermosensitive material or a metal oxide thermosensitive material.

[0016] Further, the semiconductor thermosensitive material includes but is not limited to single crystal semiconductors, polycrystalline semiconductors, glass semiconductors and organic semiconductors;

[0017] The metal thermosensitive material includes but is not limited to metal platinum, metal manganese, metal cobalt, metal nickel and metal copper;

[0018] The alloy thermosensitive material includes but is not limited to cobalt-based alloy material, nickel-based alloy material, iron-based alloy material and manganese-based alloy material;

[0019] The metal oxide thermosensitive material includes but is not limited to manganese oxide, cobalt oxide, nickel oxide and copper oxide.

[0020] The present invention further provides a soft package film, comprising a metal layer, at least one side surface of the metal layer being composited with the above-mentioned heat-sensitive plastic film.

[0021] Furthermore, a composite metal layer of a material different from the metal layer is composited on at least one side surface of the metal layer, and a thermocouple for absorbing heat energy, converting it into electrical energy and reducing the temperature is formed between the metal layer and the composite metal layer.

[0022] Furthermore, the metal layer is made of copper foil, aluminum foil, gold foil or silver foil.

[0023] The beneficial effects of the present invention are:

[0024] The soft-pack film of the present invention is provided with a thermosensitive material layer. During the heating process of the soft-pack battery, the thermosensitive material absorbs the heat generated and converts the heat into electrical energy. The electrical energy can be drawn out from the positive and negative ears of the soft-pack battery to supply power to the outside, thereby achieving the technical purpose of increasing the battery energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0026] Figure 1 It is a schematic diagram of the structure of a soft-package film embodiment of the present invention, specifically, it is a schematic diagram of the structure when a heat-sensitive plastic film is laminated only on one side of the metal layer;

[0027] Figure 2 It is a schematic diagram of the structure when a heat-sensitive plastic film is laminated on both sides of the metal layer;

[0028] Figure 3It is a schematic diagram of a structure in which a composite metal layer is arranged on one side of a metal layer and a heat-sensitive plastic film is arranged on the other side;

[0029] Figure 4 It is a schematic diagram of a structure in which a composite metal layer and a heat-sensitive plastic layer are sequentially arranged on the same side of a metal layer;

[0030] Figure 5 It is a schematic diagram of a structure in which a composite metal layer and a heat-sensitive plastic layer are sequentially arranged on both sides of a metal layer;

[0031] Figure 6a-6b It is a schematic diagram of the structure when the number of plastic layers is 3 and the number of heat-sensitive material layers is 1;

[0032] Figure 7a-7c It is a schematic diagram of the structure when the number of plastic layers is 3 and the number of heat-sensitive material layers is 2;

[0033] Figure 8a-8b It is a schematic diagram of the structure when the number of plastic layers is 3 and the number of heat-sensitive material layers is 3;

[0034] Fig. 9 This is a schematic diagram of the structure when the number of plastic layers is 3 and the number of heat-sensitive material layers is 4.

[0035] Description of reference numerals:

[0036] 1-metal layer; 2-thermosensitive plastic film; 3-plastic protective layer; 4-composite metal layer; 5-plastic layer; 6-thermosensitive material layer. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0038] like Figure 1-5 The figure is a schematic structural diagram of a soft-package film embodiment of the present invention. The soft-package film of this embodiment comprises a metal layer 1, and a heat-sensitive plastic film 2 is compounded on at least one side of the metal layer 1.

[0039] Specifically, the structure of the soft-pack film has many variations:

[0040] 1) The heat-sensitive plastic film 2 can be laminated only on one side of the metal layer 1, and at least one plastic protective layer 3 can be laminated on the other side of the metal layer 1, such as Figure 1 As shown;

[0041] 2) The metal layer 1 may be laminated with a heat-sensitive plastic film 2 on both sides, such as Figure 2 As shown;

[0042] 3) A composite metal layer 4 of a different material may be composited on at least one side of the metal layer 1, and a thermocouple for absorbing heat energy, converting it into electrical energy and cooling it is formed between the metal layer 1 and the composite metal layer 4. Specifically, the soft package film with the composite metal layer 4 also has a variety of structural forms:

[0043] 31) A composite metal layer 4 can be provided on one side of the metal layer 1 and a heat-sensitive plastic film 2 can be provided on the other side. In this case, at least one plastic protective layer 3 is also provided on the composite metal layer 4. Figure 3 As shown;

[0044] 32) A composite metal layer 4 and a heat-sensitive plastic layer 2 can be sequentially arranged on the same side of the metal layer 1, and at least one plastic protective layer 3 is composited on the other side of the metal layer 1, such as Figure 4 As shown;

[0045] 33) A composite metal layer 4 and a heat-sensitive plastic layer 2 may be sequentially arranged on both sides of the metal layer 1, such as Figure 5 shown.

[0046] Specifically, the metal layer 1 is made of copper foil, aluminum foil, gold foil or silver foil. The metal layer 1 of this embodiment is made of metal aluminum, which has good heat dissipation and ductility.

[0047] The thermosensitive plastic film of this embodiment includes a plastic layer 5 and a thermosensitive material layer 6 made of a thermosensitive material; and the relationship between the plastic layer 5 and the thermosensitive material layer 6 satisfies:

[0048] When the number of plastic layers 5 is n, the number of heat-sensitive material layers 6 is 1 to n+1; n is a positive integer greater than or equal to 1; and when the number of heat-sensitive material layers 6 is greater than or equal to 2, at least one plastic layer 5 is provided between two adjacent heat-sensitive material layers 6. Specifically,

[0049] like Figure 6a and Figure 6b As shown, it is a schematic diagram of the structure when the number of plastic layers 5 is 3 and the number of heat-sensitive material layer 6 is 1;

[0050] like Figure 7a-7c As shown, it is a schematic diagram of the structure when the number of plastic layers 5 is 3 and the number of heat-sensitive material layers 6 is 2;

[0051] like Figure 8a and Figure 8b As shown, it is a schematic diagram of the structure when the number of plastic layers 5 is 3 and the number of heat-sensitive material layers 6 is 3;

[0052] like Fig. 9 As shown, it is a schematic structural diagram when the number of plastic layers 5 is 3 and the number of heat-sensitive material layers 6 is 4.

[0053] That is, when the number of plastic layers 5 is n=3, the number of heat-sensitive material layers 6 can be 1-4 layers, and so on, which will not be repeated. The number of heat-sensitive material layers 7 is selected according to the number of plastic layers 6 and actual use requirements, which will not be repeated.

[0054] Furthermore, the thermoelectric potential of the thermosensitive materials in the thermosensitive material layer 6 is in the same direction, which can further improve the efficiency of absorbing heat and converting heat energy into electrical energy. Of course, the thermosensitive material can be in one-dimensional, two-dimensional, three-dimensional or multi-dimensional form, which will not be repeated.

[0055] Furthermore, the thermosensitive material is a semiconductor thermosensitive material, a metal thermosensitive material, an alloy thermosensitive material or a metal oxide thermosensitive material. Specifically, semiconductor thermosensitive materials include but are not limited to single crystal semiconductors, polycrystalline semiconductors, glass semiconductors and organic semiconductors; metal thermosensitive materials include but are not limited to metal platinum, metal manganese, metal cobalt, metal nickel and metal copper; alloy thermosensitive materials include cobalt-based alloy materials, nickel-based alloy materials, iron-based alloy materials and manganese-based alloy materials; metal oxide thermosensitive materials include but are not limited to manganese oxide, cobalt oxide, nickel oxide and copper oxide.

[0056] The soft-pack film of this embodiment is provided with a thermosensitive material layer. During the heating process of the soft-pack battery, the thermosensitive material absorbs the heat generated and converts the heat into electrical energy. The electrical energy can be drawn out from the positive and negative ears of the soft-pack battery to supply power to the outside, thereby achieving the technical purpose of increasing the battery energy.

[0057] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A soft packaging film, characterized in that: It comprises a metal layer, at least one side of which is laminated with a thermosensitive plastic film; the thermosensitive plastic film comprises a plastic layer and a thermosensitive material layer made of a thermosensitive material; The number of plastic layers is n, where n is a positive integer greater than or equal to 1; The number of layers of the heat-sensitive material layer is 1 to n+1; When the number of the heat-sensitive material layers is greater than or equal to 2, at least one plastic layer is disposed between two adjacent heat-sensitive material layers; The thermoelectric potential directions of the thermosensitive materials in the thermosensitive material layer are the same; A composite metal layer of a material different from the metal layer is composited on at least one side of the metal layer, and a thermocouple for absorbing heat energy, converting it into electrical energy and cooling it is formed between the metal layer and the composite metal layer; The thermosensitive material is a semiconductor thermosensitive material, a metal thermosensitive material, an alloy thermosensitive material or a metal oxide thermosensitive material; The semiconductor thermosensitive material includes a single crystal semiconductor, a polycrystalline semiconductor, a glass semiconductor or an organic semiconductor; The metal thermosensitive material includes metal platinum, metal manganese, metal cobalt, metal nickel or metal copper; The alloy thermosensitive material includes a cobalt-based alloy material, a nickel-based alloy material, an iron-based alloy material or a manganese-based alloy material; The metal oxide thermosensitive material includes manganese oxide, cobalt oxide, nickel oxide or copper oxide; The metal layer is made of copper foil, aluminum foil, gold foil or silver foil.

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