CN214528807U

CN214528807U - Puncture-resistant and drop-proof hot-melt double-sided adhesive tape for lithium ion battery

Info

Publication number: CN214528807U
Application number: CN202022408119.6U
Authority: CN
Inventors: 姚海瑞; 黄碧君; 周宗增; 李俊; 蔣建波; 黎惠华; 曾丽娟; 叶志斌
Original assignee: Innova Electronic Materials Co ltd
Current assignee: Innova Electronic Materials Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-10-29
Anticipated expiration: 2030-10-26

Abstract

The utility model discloses an anti-puncture and anti-drop hot melt double faced adhesive tape for a lithium ion battery, which comprises release paper, a protective layer, a hot melt adhesive layer, a metal foil substrate, a flame-retardant acrylic adhesive layer, a phase change layer and a rubber layer, wherein the hot melt adhesive layer is connected with the lower end surface of the metal foil substrate; the protective layer is connected with the lower end face of the hot melt adhesive layer; the release paper is connected with the lower end face of the protective layer; the flame-retardant acrylic adhesive layer is connected with the upper end face of the metal foil substrate; the phase change layer is connected with the upper end face of the flame-retardant acrylic adhesive layer; the rubber layer is connected with the upper end face of the phase change layer. The utility model effectively controls the naked electric core to paste the using effect of the double-sided hot melt adhesive under the combined action of the release paper coating protective layer and the hot melt adhesive layer, so that the adhesion phenomenon caused by stacking between the naked electric cores is not easy to occur, and the double-sided hot melt adhesive is ensured to have excellent laminating performance in the subsequent working procedures; the metal foil base material effectively prevents the double-sided adhesive tape and the battery cell material from being pierced by hard objects to cause the danger of short circuit of the battery.

Description

Puncture-resistant and drop-proof hot-melt double-sided adhesive tape for lithium ion battery

Technical Field

The utility model relates to a lithium ion battery production technical field especially relates to a lithium ion battery is with anti dropping hot melt double faced adhesive tape that impales.

Background

With the development of microelectronic technology at the end of the twentieth century, miniaturized devices are increasing day by day, high requirements are put on power supplies, and lithium ion batteries enter a large-scale practical stage.

The lithium ion batteries are classified into two categories, namely liquid lithium ion batteries and polymer lithium ion batteries according to different electrolyte materials. When the liquid lithium ion battery is overcharged, short-circuited and the like, the phenomena of temperature rise, decomposition of a positive electrode material, oxidation of a negative electrode and an electrolyte material and the like can occur in the battery, so that gas expansion and increase of the internal pressure of the battery are caused, and explosion can occur when the pressure reaches a certain degree. And the polymer lithium ion battery does not generate a large amount of gas due to liquid boiling because of the use of colloidal electrolyte, thereby avoiding the possibility of violent explosion.

The polymer lithium ion battery is also called as a soft package battery, the existing battery shell is made of an aluminum-plastic composite film, the problem that a battery core and the shell fall off exists, and the battery shell is made of a film, so that the battery core can be pierced when the soft package battery is collided.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a prevent that electric core and battery case from droing and can make the anti falling hot melt double faced adhesive tape that punctures of anti puncture of lithium ion battery of electric core ability with anti puncture.

The puncture-resistant and drop-proof hot melt double faced adhesive tape for the lithium ion battery comprises release paper, a protective layer, a hot melt adhesive layer, a metal foil substrate, a flame-retardant acrylic adhesive layer, a phase change layer and a rubber layer, wherein the hot melt adhesive layer is connected with the lower end face of the metal foil substrate; the protective layer is connected with the lower end face of the hot melt adhesive layer; the release paper is connected with the lower end face of the protective layer; the flame-retardant acrylic adhesive layer is connected with the upper end face of the metal foil substrate; the phase change layer is connected with the upper end face of the flame-retardant acrylic adhesive layer; the rubber layer is connected with the upper end face of the phase change layer.

According to the utility model discloses lithium ion battery is with anti impaling dropproof hot melt double faced adhesive tape has following technological effect at least: through to under the combined action from type paper coating protective layer and hot melt adhesive layer both, the result of use that this two-sided hot melt adhesive is pasted to naked electric core of effective control, the adhesion phenomenon because of stacking the production between the naked electric core of difficult appearance ensures that two-sided hot melt adhesive still has good laminating performance in follow-up process. The metal foil base material effectively prevents the double-sided adhesive tape and the battery cell material from being pierced by hard objects to cause the danger of short circuit of the battery. The phase change layer is coated between the flame-retardant acrylic layer and the rubber layer, so that the impact of external heat inside the battery can be buffered, and the safety and the use performance of the double-sided hot melt adhesive can be ensured.

According to some embodiments of the invention, the metal foil substrate is one of an aluminum foil, a copper foil, a nickel foil, a stainless steel foil.

According to some embodiments of the present invention, the phase change layer is a high thermal conductivity solid graphite composite phase change material.

According to some embodiments of the invention, the thickness of the release paper is 25 to 75 μm.

According to some embodiments of the invention, the protective layer has a thickness of 2 to 15 μm.

According to some embodiments of the present invention, the thickness of the hot melt adhesive layer is 10 to 30 μm.

According to some embodiments of the invention, the metal foil substrate has a thickness of 5 to 50 μm.

According to some embodiments of the utility model, the thickness of fire-retardant ya keli glue film is 2 ~ 50 μm.

According to some embodiments of the invention, the thickness of the phase change layer is 10 to 1000 μm.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is the utility model discloses lithium ion battery is with anti structure schematic diagram of impaling dropproof hot melt double faced adhesive tape.

Reference numerals: the adhesive comprises a metal foil substrate 100, a hot melt adhesive layer 200, a protective layer 300, release paper 400, a flame-retardant acrylic adhesive layer 500, a phase change layer 600 and a rubber layer 700.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of items is that two or more items are to be understood, and the description of the orientation is related to, for example, the orientation or positional relationship indicated up and down, etc., which is based on the orientation or positional relationship shown in the drawings. The description is for convenience only and to simplify the description, and is not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the description of the present invention, unless explicitly defined otherwise, terms such as connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.

Referring to fig. 1, the puncture-resistant and drop-proof hot melt double sided adhesive for the lithium ion battery according to the embodiment of the invention comprises release paper 400, a protective layer 300, a hot melt adhesive layer 200, a metal foil substrate 100, a flame retardant acrylic adhesive layer 500, a phase change layer 600 and a rubber layer 700, wherein the hot melt adhesive layer 200 is connected with the lower end surface of the metal foil substrate 100; the protective layer 300 is connected with the lower end face of the hot melt adhesive layer 200; the release paper 400 is connected with the lower end surface of the protective layer 300; the flame-retardant acrylic adhesive layer 500 is connected with the upper end surface of the metal foil substrate 100; the phase change layer 600 is connected with the upper end surface of the flame-retardant acrylic adhesive layer 500; the rubber layer 700 is connected to the upper end surface of the phase change layer 600. The utility model discloses a to under the combined action from type paper 400 coating protective layer 300 and hot melt adhesive layer 200 both, the result of use of this two-sided hot melt adhesive is pasted to the naked electric core of effective control, is difficult for appearing the adhesion phenomenon because of stacking and producing between the naked electric core, ensures that two-sided hot melt adhesive still has good laminating performance in follow-up process. The metal foil substrate 100 effectively prevents the double-sided tape and the cell material from being pierced by hard objects to cause the risk of short circuit of the battery. The phase change layer 600 is wrapped between the flame-retardant acrylic layer and the rubber layer 700, so that the impact of external heat inside the battery can be buffered, and the safety and the use performance of the double-sided hot melt adhesive can be ensured.

The manufacturing process of the double-sided hot melt adhesive comprises the following steps:

the method comprises the following steps: coating the lower end face of the protective layer 300 with release paper 400, then placing at 80-120 ℃, and carrying out heat preservation and curing for 1-10 min to obtain a protective coating;

step two: coating a hot melt adhesive on the lower end face of the metal foil substrate 100, drying at 80-130 ℃, and carrying out heat preservation and solidification for 1-20 min to obtain a hot melt adhesive layer 200;

step three: the protective coating in the first step is attached to the hot melt adhesive layer 200 in the second step;

step four: and respectively coating flame-retardant acrylic glue on the other end face of the metal foil substrate 100, drying at 80-130 ℃, preserving heat and curing for 1-20 min, coating the phase change layer 600 after curing, drying at 80-130 ℃, preserving heat and curing for 1-30 min, coating the rubber layer 700 after curing, drying at 80-130 ℃, preserving heat and curing for 1-20 min.

In some embodiments of the present invention, the protective layer 300 is a coating layer formed by mixing synthetic rubber, synthetic resin, and acrylate pressure sensitive adhesive.

In some embodiments of the present invention, the metal foil substrate 100 is one or more of aluminum foil, copper foil, nickel foil, and stainless steel foil.

In some embodiments of the present invention, the phase change layer 600 is a high thermal conductivity solid graphite composite phase change material.

In a further embodiment of the present invention, the thickness of the release paper 400 is 25 to 75 μm. The thickness is good in stiffness of the release paper and not easy to deform.

In a further embodiment of the present invention, the thickness of the protective layer 300 is 2 to 15 μm. The thickness structure protective layer has good temperature resistance, no adhesion at the temperature below 85 ℃, and no adhesion when being stacked.

In a further embodiment of the present invention, the thickness of the hot melt adhesive layer 200 is 10 to 30 μm. The hot melt adhesive with the thickness structure keeps the adhesive force after hot pressing, and meanwhile, the glue overflow amount is less than 1 mm.

In a further embodiment of the present invention, the thickness of the metal foil substrate 100 is 5 to 50 μm. The tensile strength of the metal foil of the thickness structure is greater than 1000MPa, the puncture resistance of the adhesive tape is greatly improved, and the safety of the battery cell is further improved.

In a further embodiment of the present invention, the thickness of the flame retardant acrylic adhesive layer 500 is 2 to 50 μm. The flame-retardant acrylic adhesive layer with the thickness structure reaches the flame-retardant level of UL 94V-2, and the safety of the battery cell due to heating is improved.

In a further embodiment of the present invention, the thickness of the phase change layer 600 is 10 to 1000 μm. The phase change layer with the thickness structure plays a role in heat dissipation when the battery is charged and discharged.

In a further embodiment of the present invention, the flame retardant acrylic adhesive layer 500 is a coating layer formed by mixing a halogen-free flame retardant and an acrylate pressure-sensitive adhesive.

In a further embodiment of the present invention, the thickness of the rubber layer 700 is 2 to 50 μm.

In the description herein, references to the description of the terms "some embodiments" or "conceivably" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a lithium ion battery is with anti impaling dropproof hot melt double faced adhesive tape which characterized in that includes:

a metal foil substrate;

the hot melt adhesive layer is connected with the lower end face of the metal foil base material;

the protective layer is connected with the lower end face of the hot melt adhesive layer;

the release paper is connected with the lower end face of the protective layer;

the flame-retardant acrylic adhesive layer is connected with the upper end face of the metal foil substrate;

the phase change layer is connected with the upper end surface of the flame-retardant acrylic adhesive layer;

and the rubber layer is connected with the upper end face of the phase change layer.

2. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to claim 1, characterized in that: the metal foil substrate is one of aluminum foil, copper foil, nickel foil and stainless steel foil.

3. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to claim 1, characterized in that: the phase change layer is made of a high-thermal-conductivity solid graphite composite phase change material.

4. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to any one of claims 1 to 3, characterized in that: the thickness of the release paper is 25-75 mu m.

5. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to any one of claims 1 to 3, characterized in that: the thickness of the protective layer is 2-15 mu m.

6. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to any one of claims 1 to 3, characterized in that: the thickness of the hot melt adhesive layer is 10-30 mu m.

7. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to any one of claims 1 to 3, characterized in that: the thickness of the metal foil substrate is 5-50 μm.

8. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to any one of claims 1 to 3, characterized in that: the thickness of the flame-retardant acrylic adhesive layer is 2-50 mu m.

9. The puncture-resistant and drop-proof hot melt double sided adhesive tape for the lithium ion battery according to any one of claims 1 to 3, characterized in that: the thickness of the phase change layer is 10-1000 mu m.