Electric viscosity-reducing adhesive tape used for fixing battery and easy to disassemble

Abstract

The utility model provides an easy-to-disassemble electric viscosity-reducing adhesive tape for fixing a battery, which is characterized in that the easy-to-disassemble electric viscosity-reducing adhesive tape is provided with a multi-layer fitting structure and at least comprises a first protective layer, an electric viscosity-reducing adhesive layer, a conductive buffer adhesive layer and a second protective layer which are sequentially arranged in a fitting manner, the conductive buffer rubber layer at least comprises a rubber film layer and a conductive base material layer. By adopting the electric viscosity-reducing adhesive tape used for fixing the battery and easy to disassemble, the battery can be quickly disassembled only by adopting a low-voltage electrifying mode under a low-voltage condition, the damage to a battery structural member can be avoided, and the disassembled electric viscosity-reducing adhesive tape still keeps relatively strong viscosity and can be repeatedly used, so that the cost is reduced. The processing cost is reduced; particularly, when the surface of the battery shell or the conductive middle frame is attached in a large area, bubbles can be avoided, and the use stability of the product is improved; in addition, the buffering effect of the conductive buffering rubber layer can protect internal elements of the battery when the electronic equipment falls off.

Description

Technical Field

[0001] The utility model relates to the technical field of adhesive tapes, in particular to an easily detachable electrical adhesive tape used for fixing batteries. Background Art

[0002] In lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries and other batteries, adhesive tape is required to achieve its purpose, such as battery fixation, electrode outlet insulation, terminal fixation, and insulating spacers. The battery can be fixed in the battery case by using adhesive tape.

[0003] With the development of science and technology, people have higher requirements for the lightweight of electronic devices. Therefore, the batteries of electronic products are usually fixed in the device housing by adhesive or easy-pull adhesive to achieve the effect of thinning. But the battery needs to be removed for maintenance or recycling. However, the two methods of fixing with adhesive or easy-pull adhesive in the prior art have the following shortcomings: (1) When fixing with adhesive, the battery usually needs to be quickly heated with a hot air gun to make the adhesive invalid before removing the battery, but the high temperature may damage the electronic components and the battery may also explode; (2) When fixing with easy-pull adhesive, the easy-pull adhesive needs to be pulled out at a certain angle (≤30°) to separate the battery from the device. If the angle is too large, the tape will break due to friction; (3) When the easy-pull adhesive is attached, bubbles are easily generated, resulting in uneven installation of the battery, which will interfere with the internal structure of the product and may damage and interfere with other original components when the device falls; (4) The easy-pull adhesive is usually made of rubber material, which has poor aging resistance. After aging, it is easy to be pulled off, and the battery cannot be removed. In addition, the easy-pull adhesive is easy to deform after removal and cannot be reused.

[0004] In the prior art, the electrical debonding tape includes a conductive electrical debonding adhesive and a release film. The electrical debonding adhesive is a kind of adhesive that can destroy the adhesion at the interface between the adhesive and the substrate under the condition of applying voltage, so that the peeling force is significantly reduced, thereby peeling the tape from the surface of the substrate. Therefore, the electrical debonding adhesive can be used for the disassembly and recycling of components. However, the existing adhesive sheets for electrical debonding are usually substrate-free. On the one hand, there are problems such as poor processing performance and easy glue overflow during die-cutting; on the other hand, the adhesive sheet has weak viscosity, and it is easy to produce bubbles when laminating a large area, which reduces the impact resistance of the tape and causes debonding when the electronic device falls; moreover, after the electrical debonding tape is peeled off from the substrate, the viscosity of the electrical debonding adhesive is significantly reduced after the electrical debonding adhesive is energized, and it cannot be reused. In particular, when the electrical debonding tape is used for battery fixation, it is difficult to peel and disassemble after the electrical debonding adhesive layer is energized. Utility Model Content

[0005] In view of this, in order to solve the above problems, the utility model provides an electrically debonding tape for fixing batteries and which is easy to disassemble. The battery can be quickly disassembled by simply energizing it under low voltage conditions, thereby avoiding damage to the battery structural parts. The electrically debonding tape still maintains strong adhesion after disassembly and can be used repeatedly, thereby reducing processing costs. In particular, when a large area of ​​the battery or the conductive middle frame is bonded to the surface, the generation of bubbles can be avoided, thereby improving the stability of product use. Moreover, the buffer component can protect the internal components of the battery when the electronic device falls.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a highly adhesive and easily disassembled electrical debonding tape for battery fixing, having a multi-layer bonding structure, comprising at least a first protective layer - an electrical debonding adhesive layer - a conductive buffer adhesive layer - a second protective layer bonded in sequence.

[0007] Preferably, the conductive buffer adhesive layer comprises a conductive substrate layer and an adhesive film layer, and the multilayer structure comprises the first protective layer-the electrical viscosity-reducing adhesive layer-the conductive substrate layer-the adhesive film layer-the second protective layer. The conductive substrate layer and / or the adhesive film layer have a buffering function.

[0008] Preferably, the adhesive film layer includes a built-in buffer component; the buffer component is a microsphere structure; the microsphere structure includes a plurality of expanded microspheres uniformly distributed inside the adhesive film layer.

[0009] Preferably, the particle size of the expanded microspheres is 1-200 μm; more preferably, 1-20 μm.

[0010] Preferably, the adhesive film layer is a conductive adhesive layer, at least one end of the conductive adhesive layer is provided with an electrical connector, and the electrical connector is an integral structure with the conductive adhesive layer or is fixed to the end of the conductive adhesive layer.

[0011] Preferably, the conductive substrate layer is a conductive film.

[0012] Preferably, the conductive film is metal foil, conductive non-woven fabric or conductive plastic film.

[0013] Preferably, the conductive substrate layer comprises a conductive layer and a buffer layer of an integrated structure; the conductive layer is bonded to the adhesive layer; the conductive layer is a metal layer; and the buffer layer is a plastic layer.

[0014] Preferably, the conductive substrate layer is a plastic film with metal plated on one side. More preferably, the plastic film is a polyurethane film or a polyolefin film.

[0015] Preferably, the adhesive film layer and the conductive substrate layer constitute the conductive buffer adhesive layer, and the lengths of the adhesive film layer and the conductive substrate layer are equal or the length of the conductive substrate layer is greater than that of the adhesive film layer.

[0016] At least one end of the conductive buffer rubber layer is provided with an electrical connector; the electrical connector is a conductive joint formed by extending the end of the conductive buffer rubber layer outward along the length direction, and the length of the conductive buffer rubber layer at the extended end is greater than the length of the electrical debonding rubber layer.

[0017] Preferably, the thickness of the conductive substrate layer is 1 to 1000 μm.

[0018] Preferably, the thickness of the adhesive film layer is 1 to 1000 μm.

[0019] Preferably, the first protective layer is a release paper or a film.

[0020] Preferably, the second protective layer is a grid-shaped release paper or film.

[0021] Preferably, at least one end of the conductive adhesive layer is provided with a conductive connector, and the material of the conductive connector is the same as that of the conductive substrate layer.

[0022] The insulating layer material of the electrical adhesive tape can be PVC, etc., which has good insulation performance. Therefore, the electrical adhesive tape can have excellent isolation performance while maintaining conductive performance; the self-adhesive layer of the electrical adhesive tape can be rubber, acrylic acid, etc., which has good bonding performance.

[0023] When using the electrical debonding tape, tear off the first protective layer and the second protective layer, and stick the electrical debonding tape on the conductive middle frame and the battery shell surface respectively to fix the battery in the conductive middle frame; when disassembling, connect the conductive middle frame with the electrical debonding adhesive and the conductive buffer layer through conductive wires to form an electrical debonding circuit, so that the electrical debonding tape becomes part of the circuit. By applying a low voltage, the adhesive surface of the electrical debonding tape bonded to the conductive middle frame decreases in viscosity and falls off from the conductive middle frame, thereby realizing the disassembly of the battery. Due to the presence of the conductive material in the electrical debonding tape, the current can smoothly pass through the electrical debonding tape to achieve the purpose of conductivity.

[0024] Beneficial technical effects obtained by the utility model:

[0025] 1. The utility model sequentially arranges a release layer, an electrical viscosity-reducing adhesive layer, a conductive buffer adhesive layer and a textured release layer, and the electrical viscosity-reducing adhesive layer and the conductive buffer adhesive layer have good adhesion before power is supplied, thereby improving the stability of the battery of the electronic device during daily use, and the adhesion of the electrical viscosity-reducing adhesive layer is significantly reduced after power is supplied, so the battery can be easily disassembled with almost no residual adhesive, making battery disassembly easier, safer and more successful.

[0026] 2. The expanded microspheres or buffer substrate in the conductive buffer adhesive layer of the utility model have buffering capabilities, which can effectively improve the impact resistance of the tape, so that the battery stability of the electronic device can be maintained when it falls.

[0027] 3. The utility model uses a conductive adhesive layer that is bonded to a textured release layer to form a grid pattern, which can easily and effectively remove the remaining air during the pasting process. After the pasting is left to stand for a period of time, the grid pattern can disappear by itself, making the adhesive surface perfectly flat. When a large area is pasted, the generation of bubbles can be avoided, thereby improving the stability of product use.

[0028] 4. The electric de-adhesive tape of the utility model can be reused, which greatly reduces the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The utility model provides a multi-layer structure of an electrical debonding tape.

[0030] Figure 2 The embodiment of the utility model provides another multi-layer structure of an electrical debonding tape.

[0031] Figure 3 A schematic diagram of circuit connection of the electric debonding tape provided in an embodiment of the utility model when it is powered on.

[0032] Figure 4 Another circuit connection schematic diagram of the electric de-viscosity tape provided in the embodiment of the present invention when it is powered on.

[0033] Among them, the attached drawings indicate: 1. electrical viscosity-reducing adhesive layer; 2. adhesive film layer; 3. first protective layer; 4. second protective layer; 5. electrical substrate layer; 9. conductive connector. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, not all of the embodiments.

[0035] The electrical debonding tape comprises a first release layer, an electrical debonding adhesive layer, a conductive substrate layer, an adhesive film layer, and a second release layer which are laminated and arranged in sequence.

[0036] The material of the conductive substrate layer is conductive metal foil or conductive non-woven fabric or metal-plated plastic film with metal plated on one side; the thickness is 1-1000 μm, preferably 10-20 μm.

[0037] Metal foils include copper foil, aluminum foil, magnesium foil, copper foil, iron foil, tin foil, gold foil, etc.

[0038] In the metal-plated plastic film, the plated metal can be aluminum, nickel, chromium, tin, gold, silver, platinum, zinc, titanium, tungsten, zirconium, palladium, etc.; the plastic can be polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, acrylic resins such as polymethyl methacrylate, etc.

[0039] When in use, the electrical adhesive layer is attached to the conductive middle frame, and the conductive adhesive layer is attached to the non-conductive battery shell surface. The positive electrode of the power supply is clamped on the conductive connector set at the end of the conductive buffer adhesive layer, and the negative electrode of the power supply is clamped on the conductive middle frame. After a 10V DC power supply is connected for 30 seconds, the battery can be easily peeled off from the middle frame.

[0040] The above technical solution is described in detail below through specific embodiments.

[0041] Example 1

[0042] The present embodiment provides an electrically debonding tape that can be used to fix batteries; the electrically debonding tape has a multi-layer structure that is laminated and sequentially includes a first protective layer 3-an electrically debonding adhesive layer 1-a conductive buffer adhesive layer-a second protective layer 4, and the conductive buffer adhesive layer has both conductive and buffering functions.

[0043] Specific reference Figure 1 The electrical anti-viscosity tape comprises a first protective layer 3, an electrical anti-viscosity adhesive layer 1, a conductive substrate layer 5, an adhesive film layer 2, and a second protective layer 4, wherein the conductive substrate layer 5 and the adhesive film layer 2 form a conductive buffer adhesive layer. Both the electrical anti-viscosity adhesive layer 5 and the adhesive film layer 2 are double-sided adhesives, and can be directly attached during the preparation process to form a multi-layer structure.

[0044] The first protective layer 3 is a release paper or a release film, and the electrical debonding adhesive is coated on the first protective layer 3 and cured to form an electrical debonding adhesive layer 1, and the thickness of the electrical debonding adhesive layer is 60 μm. The second protective layer 4 is a textured release paper or a textured release film.

[0045] Preferably, a tearing portion is provided at the end of the first protective layer 3 and / or the second protective layer 4. As one of the preferred embodiments, the tearing portion comprises: at least one end of the first protective layer 3 and / or the second protective layer 4 is longer than the length of the electrical debonding adhesive layer, and the excess portion is folded to form a folded end.

[0046] At least one end of the adhesive film layer 2 is provided with a conductive connector 9, and copper foil is selected as the conductive substrate 5. In this embodiment, the electrical adhesive layer 1 and the adhesive film layer 2 are respectively bonded to the two sides of the conductive substrate layer 5 to form an adhesive layer, wherein the thickness of the conductive substrate layer 5 is 15 μm, and then the conductive connector is attached to the end of the conductive adhesive layer to obtain the electrical adhesive tape with a multi-layer structure of this embodiment. Preferably, the material of the conductive substrate layer is copper foil, and aluminum foil, magnesium foil, iron foil, tin foil, and gold foil can also be selected as substitutes.

[0047] Furthermore, a buffer component may be built into the adhesive film layer 2. Specifically, expanded microspheres are added into the acrylic adhesive as a built-in second buffer component, and the expanded microspheres are evenly distributed in the acrylic adhesive to form a buffer layer.

[0048] The expanded microspheres used in this embodiment are thermoplastic hollow polymer microspheres, which are composed of a thermoplastic polymer shell and sealed liquid alkane gas, and are evenly dispersed in the adhesive film layer 2 to form a built-in buffer layer.

[0049] In this embodiment, the material of the adhesive film layer 2 is an adhesive, including but not limited to an acrylic adhesive. The adhesive film layer can be made conductive by adding conductive metal powder to the adhesive and evenly dispersing it in the acrylic adhesive, i.e., a conductive adhesive layer. The acrylic adhesive is coated on the second protective layer 4 and finally cured to obtain a conductive adhesive layer with a thickness of 65 μm. Preferably, the metal powder is nickel powder.

[0050] When the adhesive film layer 2 is a conductive adhesive layer, the conductive connector 9 is an integral structure with the conductive adhesive layer or is fixed to at least one end of the conductive adhesive layer.

[0051] When in use, the first protective layer 3 and the second protective layer 4 of the prepared electrical debonding tape are torn off respectively, the electrical debonding adhesive layer 1 is attached to the conductive middle frame of the battery, and the adhesive film layer 2 is attached to the surface of the battery shell, so that the battery is adhered to the conductive middle frame for packaging.

[0052] See also Figure 3 When the battery needs to be disassembled, the conductive middle frame and the conductive connector 9 are connected through a power line. After power is turned on (low voltage), the viscosity of the bonding surface between the electrical debonding adhesive layer 1 and the conductive middle frame decreases, so that the electrical debonding adhesive tape is separated from the conductive middle frame, thereby removing the battery shell from the surface of the conductive middle frame, realizing battery recycling, and will not cause damage to the structural components inside the battery.

[0053] As another preferred embodiment, the conductive substrate layer 5 can also serve as a buffer layer to play a buffering role; its main material is TPU (polyurethane), and a conductive metal layer is plated on one side, so that one side has conductivity and the other side has insulation, forming a single-sided metal-plated TPU film with an integral structure, wherein the metal-plated side is laminated with the adhesive film layer 2. Optionally, the metal can be any one of aluminum, nickel, chromium, tin, gold, silver, platinum, zinc, titanium, tungsten, zirconium, palladium, etc.

[0054] Preferably, the main material in the conductive substrate layer may also be other polymers, including but not limited to polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, acrylic resins such as polymethyl methacrylate, etc.

[0055] The electrical anti-viscosity adhesive layer 1 is bonded to one side of the metal layer of the conductive substrate layer 5, and then the film layer 2 is bonded to the TPU surface of the conductive substrate layer 5. The edges may not completely overlap. At this time, at least one end of the conductive buffer adhesive layer formed by the conductive substrate layer 5 and the film layer 2 extends along the length direction, so that the length of the conductive buffer adhesive layer is greater than the electrical anti-viscosity adhesive layer. One end of the extended conductive buffer adhesive layer serves as a conductive connector 9. At this point, the electrical anti-viscosity adhesive tape is obtained. When the battery is removed, the power cord can be fixed to the surface of the metal layer of the conductive substrate layer 5.

[0056] At this time, the conductive substrate layer can play the dual role of a conductive layer and a buffer layer. On the one hand, when the battery or electronic device falls from a height, it is used to buffer the impact force and protect the components inside the battery from damage; on the other hand, its conductivity can serve as part of the circuit when the battery is removed to form a closed circuit.

[0057] See also Figure 2 When the material of the film layer 2 is an adhesive, including but not limited to acrylic adhesive, and no conductive material (such as metal particles) is added, that is, the film layer 2 is not conductive, at this time, the conductive connector 9 includes a laminated structure formed by a conductive substrate layer 5 and a film layer 2, at least one end of which extends outward along the length direction, and after the extension, the length of the conductive substrate layer 5 and the film layer 2 is greater than the electrical debonding layer.

[0058] See also Figure 4 When the battery needs to be disassembled, the conductive middle frame and the conductive connector 9 are electrically connected, and the adhesive film layer 2 and the conductive substrate layer 5 are electrically connected through a power line, or connected to the end of the conductive substrate layer 5. After power is turned on (low voltage), the viscosity of the bonding surface of the electrically debonding adhesive layer 1 and the conductive middle frame decreases, so that the electrically debonding adhesive tape is separated from the conductive middle frame, thereby removing the battery shell from the surface of the conductive middle frame, realizing battery recycling, and will not damage the structural components inside the battery.

[0059] When the battery needs to be disassembled, the conductive middle frame and the conductive connector 9 are connected through a power line to form a closed circuit. After power is turned on (low voltage), the viscosity of the bonding surface between the conductive adhesive layer and the conductive middle frame decreases, so that the electrical debonding tape is separated from the conductive middle frame, thereby removing the battery shell from the surface of the conductive middle frame, realizing battery recycling, and will not cause damage to the structural components inside the battery.

[0060] The adhesive force of the electric de-adhesive tape provided by the utility model is greatly reduced after power is applied, and it has a good electric de-adhesive effect. After the electric de-adhesive, there is almost no residue on the surface of the adhered object. When it is re-applied after power is applied once and twice, it still maintains a good peeling force, has the same electric de-adhesive effect, and can be reused. Furthermore, the utility model uses a textured release film as a protective layer, so no bubbles are generated when the electric de-adhesive tape is applied over a large area, and the texture on the adhesive surface disappears by itself, avoiding the generation of bubbles. In the prior art, the peeling force of the tape that does not include a conductive substrate is significantly reduced when it is re-applied after power is applied once and twice, making it difficult to reuse; and the easy-pull adhesive tape will be deformed when it is pulled out after the first use, so a large number of bubbles will be generated when it is applied for the second time, making it difficult to completely flatten.

[0061] Therefore, by adding a conductive substrate layer, since the hardness of its metal foil or metal-plated plastic film with metal on one side is significantly higher than that of the double-sided adhesive film (electrically de-viscosity adhesive layer and adhesive film layer), the stiffness of the electrically de-viscosity adhesive tape is improved. On the one hand, its flatness is not affected after disassembly, and the viscosity of the electrically de-viscosity adhesive layer is less affected by low-voltage power supply. Therefore, it can be reused many times to reduce the cost of use; on the other hand, the conductive substrate layer can ensure that the electrically de-viscosity adhesive tape can be more flat when pasted with the battery shell and the conductive middle frame, and no bubbles are generated; in particular, the conductive substrate of the utility model uses plastic as the main material and can also play a buffering role, or, in the inner buffer component in the adhesive film layer, when the battery falls, the electrically de-viscosity adhesive tape can have a buffering effect to protect the internal components of the battery from damage.

[0062] The above are only preferred embodiments of the present invention, which do not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any changes, modifications, substitutions, integrations and parameter changes to these embodiments within the spirit and principle of the present invention through conventional substitutions or capable of achieving the same functions without departing from the principles and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. An electrical adhesive tape for fixing batteries and being easily removable, characterized in that: The multilayer structure at least comprises a first protective layer, an electrical viscosity-reducing adhesive layer, a conductive buffer adhesive layer and a second protective layer which are laminated in sequence.

2. The electrical debonding tape according to claim 1, characterized in that: The conductive buffer adhesive layer comprises a conductive substrate layer and an adhesive film layer; The multilayer structure includes the first protective layer-the electrical viscosity-reducing adhesive layer-the conductive substrate layer-the adhesive film layer-the second protective layer.

3. The electrical debonding tape according to claim 2, characterized in that: The adhesive film layer includes a built-in buffer component; the buffer component is a microsphere structure; the microsphere structure includes a plurality of expanded microspheres uniformly distributed inside the adhesive film layer.

4. The electrical debonding tape according to claim 2, characterized in that: The adhesive film layer is a conductive adhesive layer, at least one end of the conductive adhesive layer is provided with an electrical connector, and the electrical connector and the conductive adhesive layer are an integral structure or are fixed to the end of the conductive adhesive layer.

5. The electrical debonding tape according to claim 2, characterized in that: The conductive substrate layer is a conductive film.

6. The electrical debonding tape according to claim 5, characterized in that: The conductive film is metal foil, conductive non-woven fabric or conductive plastic film.

7. The electrical debonding tape according to claim 2, characterized in that: The conductive substrate layer comprises a conductive layer and a buffer layer of an integrated structure; the conductive layer is laminated with the adhesive film layer; The conductive layer is a metal layer; the buffer layer is a plastic layer.

8. The electrical debonding tape according to claim 7, characterized in that: The conductive substrate layer is a plastic film with metal plated on one side.

9. The electrical debonding tape according to claim 7, characterized in that: At least one end of the conductive buffer adhesive layer formed by the adhesive film layer and the conductive substrate layer is provided with an electrical connector; the edges of the adhesive film layer and the conductive substrate layer may not completely overlap; The electrical connector is a conductive joint formed by extending at least one end of the conductive buffer rubber layer outward along the length direction.

10. The electrical debonding tape according to any one of claims 1 to 9, characterized in that: The first protective layer is a release paper or a film; the second protective layer is a release paper or a film having a grid shape.

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