A preparation method oflithium ion battery aluminum-plastic composite film with double heat conduction layers

Abstract

The invention belongs to the technical field of lithium ion batteries and relates to a preparation method of alithium ion battery aluminum-plastic composite film with double heat conductive layers. The method comprises the following steps: (1) coating a low-temperature hot melt adhesive on one side of an aluminum foil, standing, coating a nylon scratch-resistant layer on the low-temperature hot melt adhesive, and cold pressing molding; 2. adding powdery mineral fiber, graphene oxide and alumina power into solvent, adding thermosetting resin glue and thermosetting resin cure agent, and ultrasonic dispersing; Forming a hard heat conductive layer on the other side of the aluminum foil; 3) adding that flexible unsaturated polyester resin into a solvent, addinga curing agent, coating and forming a flexible heat conductive layer on the rigid heat conductive lay, and drying to obtain an aluminum-plastic composite film; The hard heat conductive layer provided by the invention has high hardness, can resist burrs of copper mesh and aluminum mesh, and can avoid damage of aluminum foil layer. Flexible heat conduction layer has high flexibility, which is suitable for the deformation of aluminum-plastic composite film in the process of vacuum pumping.

Description

technical field

[0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of an aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers. Background technique

[0002] Aiming at the problems in the prior art that lithium batteries packaged in metal shells are easy to release gas during use and cause explosions due to increased pressure, a new type of soft packaging material, namely aluminum-plastic film, has been introduced on the market. This packaging material can expand to release pressure , so as to prevent the occurrence of explosion accidents.

[0003] Since the polymer lithium-ion battery will release heat during use, the stability of the material will decrease. Therefore, it is urgent to solve the problem of improving the thermal conductivity of the material on the premise of ensuring the basic packaging performance. Contents of the invention

[0004] Aiming a...

Examples

preparation example Construction

[0016] The invention provides a method for preparing an aluminum-plastic composite film for a lithium-ion battery with double heat-conducting layers, comprising the following steps:

[0017] (1) Apply a layer of low-temperature hot-melt adhesive evenly on one side of the aluminum foil, and then let it stand for 1-3 minutes, then cover the nylon scratch-resistant layer on the low-temperature hot-melt adhesive, and cold press them together at room temperature;

[0018] (2) Add powdered mineral fiber, graphene oxide and alumina powder to the solvent, add thermosetting resin glue and thermosetting resin curing agent during stirring, and ultrasonically disperse the mixture; coat the other side of the aluminum foil And form a hard heat-conducting layer. After the coating is completed, it is dried through a hot drying tunnel with a temperature of 60-80°C. During the drying tunnel, the aluminum foil is in a tight state;

[0019] (3) Add the flexible unsaturated polyester resin into th...

Embodiment 1

[0038]An aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers, comprising a nylon scratch-resistant layer, an aluminum foil layer, a hard heat-conducting layer and a flexible heat-conducting layer arranged sequentially from the outside to the inside, the nylon scratch-resistant layer and the aluminum foil Layers are bonded together by low-temperature hot-melt adhesive;

[0039] The hard heat conducting layer is prepared from the following raw materials in parts by weight: 35 parts of sepiolite fiber, 5 parts of graphene oxide, 4 parts of alumina powder, 28 parts of epoxy resin glue, and 5 parts of epoxy resin curing agent , 72 parts of ethyl acetate;

[0040] The flexible heat-conducting layer is prepared from the following raw materials in parts by weight: 55 parts of flexible unsaturated polyester resin, 2 parts of aliphatic blocked polyisocyanate curing agent, and 80 parts of ethyl acetate;

[0041] The nylon scratch-resistant layer ...

Embodiment 2

[0049] An aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers, comprising a nylon scratch-resistant layer, an aluminum foil layer, a hard heat-conducting layer and a flexible heat-conducting layer arranged sequentially from the outside to the inside, the nylon scratch-resistant layer and the aluminum foil Layers are bonded together by low-temperature hot-melt adhesive;

[0050] The hard heat conducting layer is prepared from the following raw materials in parts by weight: 30 parts of sepiolite fiber, 4 parts of graphene oxide, 4 parts of alumina powder, 24 parts of epoxy resin glue, and 4 parts of epoxy resin curing agent , 66 parts of ethyl acetate;

[0051] The flexible heat-conducting layer is prepared from the following raw materials in parts by weight: 48 parts of flexible unsaturated polyester resin, 1 part of aliphatic blocked polyisocyanate curing agent, and 75 parts of ethyl acetate;

[0052] The nylon scratch-resistant layer ...

technical field

[0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of an aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers. Background technique

[0002] Aiming at the problems in the prior art that lithium batteries packaged in metal shells are easy to release gas during use and cause explosions due to increased pressure, a new type of soft packaging material, namely aluminum-plastic film, has been introduced on the market. This packaging material can expand to release pressure , so as to prevent the occurrence of explosion accidents.

[0003] Since the polymer lithium-ion battery will release heat during use, the stability of the material will decrease. Therefore, it is urgent to solve the problem of improving the thermal conductivity of the material on the premise of ensuring the basic packaging performance. Contents of the invention

[0004] Aiming a...

Examples

preparation example Construction

[0016] The invention provides a method for preparing an aluminum-plastic composite film for a lithium-ion battery with double heat-conducting layers, comprising the following steps:

[0017] (1) Apply a layer of low-temperature hot-melt adhesive evenly on one side of the aluminum foil, and then let it stand for 1-3 minutes, then cover the nylon scratch-resistant layer on the low-temperature hot-melt adhesive, and cold press them together at room temperature;

[0018] (2) Add powdered mineral fiber, graphene oxide and alumina powder to the solvent, add thermosetting resin glue and thermosetting resin curing agent during stirring, and ultrasonically disperse the mixture; coat the other side of the aluminum foil And form a hard heat-conducting layer. After the coating is completed, it is dried through a hot drying tunnel with a temperature of 60-80°C. During the drying tunnel, the aluminum foil is in a tight state;

[0019] (3) Add the flexible unsaturated polyester resin into th...

Embodiment 1

[0038]An aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers, comprising a nylon scratch-resistant layer, an aluminum foil layer, a hard heat-conducting layer and a flexible heat-conducting layer arranged sequentially from the outside to the inside, the nylon scratch-resistant layer and the aluminum foil Layers are bonded together by low-temperature hot-melt adhesive;

[0039] The hard heat conducting layer is prepared from the following raw materials in parts by weight: 35 parts of sepiolite fiber, 5 parts of graphene oxide, 4 parts of alumina powder, 28 parts of epoxy resin glue, and 5 parts of epoxy resin curing agent , 72 parts of ethyl acetate;

[0040] The flexible heat-conducting layer is prepared from the following raw materials in parts by weight: 55 parts of flexible unsaturated polyester resin, 2 parts of aliphatic blocked polyisocyanate curing agent, and 80 parts of ethyl acetate;

[0041] The nylon scratch-resistant layer ...

Embodiment 2

[0049] An aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers, comprising a nylon scratch-resistant layer, an aluminum foil layer, a hard heat-conducting layer and a flexible heat-conducting layer arranged sequentially from the outside to the inside, the nylon scratch-resistant layer and the aluminum foil Layers are bonded together by low-temperature hot-melt adhesive;

[0050] The hard heat conducting layer is prepared from the following raw materials in parts by weight: 30 parts of sepiolite fiber, 4 parts of graphene oxide, 4 parts of alumina powder, 24 parts of epoxy resin glue, and 4 parts of epoxy resin curing agent , 66 parts of ethyl acetate;

[0051] The flexible heat-conducting layer is prepared from the following raw materials in parts by weight: 48 parts of flexible unsaturated polyester resin, 1 part of aliphatic blocked polyisocyanate curing agent, and 75 parts of ethyl acetate;

[0052] The nylon scratch-resistant layer ...

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