Electrically peelable adhesive sheet, bonded body, and method for producing same

Abstract

The invention relates to the technical field of electric stripping type bonding sheets, and discloses an electric stripping type bonding sheet, a bonding body and a preparation method thereof, the electric stripping type bonding sheet comprises an electric stripping type bonding agent layer, a first unit layer and a second unit layer; the first unit layer comprises a first conductive layer and a first bonding layer which are arranged in a stacked mode, the first conductive layer is bonded to one side of the electric stripping type adhesive layer, and the first bonding layer is arranged on the side, away from the first bonding layer, of the first conductive layer and used for being matched with a first bonded object in a bonding mode; the second unit layer comprises a second conducting layer and a second bonding layer which are arranged in a stacked mode, the second conducting layer is bonded to one side of the electric stripping type adhesive layer, and the second bonding layer is arranged on the side, away from the second bonding layer, of the second conducting layer and used for being matched with a second bonded object in a bonding mode. According to the invention, the electric stripping effect of the electric stripping type adhesive sheet can be guaranteed, so that the applicability of the electric stripping type adhesive sheet is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrically peelable adhesive sheets, and in particular to an electrically peelable adhesive sheet, a joint body and a preparation method thereof. Background Art

[0002] In the related art, an electro-peelable adhesive sheet primarily comprises a laminated electro-peelable adhesive layer and a conductive portion. The electro-peelable adhesive layer is intended to directly contact a metal adherend, and the conductive portion comprises a conductive layer disposed on the surface of the electro-peelable adhesive layer facing away from the adherend. When no voltage is applied, the electro-peelable adhesive layer exhibits adhesive properties, allowing it to adhere to the adherend. When the adherend and the conductive layer are connected to external conductive terminals and a voltage is applied to the electro-peelable adhesive layer, the electro-peelable adhesive layer exhibits electrical debonding properties, reducing its adhesion and enabling it to be peeled from the adherend.

[0003] However, for metal adherends with a dense oxide layer on their surface, the presence of the dense oxide layer significantly increases the interfacial resistance between the adherend and the electro-peelable adhesive layer. This makes it difficult for the electro-peelable adhesive layer to form an effective current path when a voltage is applied, thereby affecting the electro-peelable effect of the electro-peelable adhesive sheet. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide an electro-peelable adhesive sheet, a joint body and a preparation method thereof, aiming to ensure the electro-peelable effect of the electro-peelable adhesive sheet and improve the applicability of the electro-peelable adhesive sheet.

[0005] In order to achieve the above object, the present invention provides an electrically releasable adhesive sheet comprising:

[0006] an electro-peelable adhesive layer;

[0007] a first unit layer, the first unit layer comprising a first conductive layer and a first adhesive layer stacked along the first direction, the first conductive layer being disposed on one side of the electrically peelable adhesive layer and bonded to the electrically peelable adhesive layer, and the first adhesive layer being disposed on a side of the first conductive layer facing away from the first adhesive layer, for bonding to a first adherend; and

[0008] The second unit layer includes a second conductive layer and a second adhesive layer stacked along the first direction, the second conductive layer is arranged on one side of the electrically peelable adhesive layer and is bonded to the electrically peelable adhesive layer, and the second adhesive layer is arranged on the side of the second conductive layer away from the second adhesive layer and is used to bond to a second adherend.

[0009] In one embodiment, the first adhesive layer is provided with a connection hole, which penetrates the first adhesive layer along the first direction and is arranged opposite to the first conductive layer. The first conductive layer is used to be connected to the first adherend through the connection hole.

[0010] In one embodiment, the size of the connection hole is smaller than the size of the electrically-peelable adhesive layer.

[0011] In one embodiment, a projection of the connection hole falls into the electrically-peelable adhesive layer along the first direction.

[0012] In one embodiment, a projection of the electrically-peelable adhesive layer falls into the first conductive layer and / or within the first conductive layer along the first direction.

[0013] In one embodiment, the second conductive layer includes a substrate and a conductive structure stacked along the first direction, wherein the conductive structure is provided on one side of the electrically-peelable adhesive layer and is bonded to the electrically-peelable adhesive layer.

[0014] The present invention also provides a joint body comprising a first adherend, a second adherend, and the electrically-peelable adhesive sheet described in any one of the preceding items, wherein the first adherend and the second adherend are disposed on opposite sides of the electrically-peelable adhesive sheet and are bonded to the first unit layer and the second unit layer, respectively.

[0015] In one embodiment, the first adherend has a conductive area on a side facing the first unit layer, and the first adherend further includes a connection area for connecting to a conductive terminal, and the conductive area is electrically connected to the connection area;

[0016] The first adhesive layer is provided with a connection hole, the connection hole and the conductive area are arranged opposite to each other, the surface of the conductive area is covered with a conductive reinforcement layer, and the conductive reinforcement layer is passed through the connection hole to be connected to the first conductive layer.

[0017] The present invention further provides a method for preparing a conjugate, which is applicable to any of the conjugates described above, and the method for preparing the conjugate comprises the following steps:

[0018] placing an electrically releasable adhesive sheet between the first adherend and the second adherend;

[0019] When combining the first adherend and the second adherend, the first adhesive layer and the second adhesive layer are respectively attached to the first adherend and the second adherend, and the first adherend is connected to the first conductive layer through the connection hole of the first adhesive layer;

[0020] When the first adherend and the second adherend are to be peeled off, the first adherend and the second conductive layer are connected to conductive terminals, respectively, so that a voltage is applied to the electrically-peelable adhesive layer to peel off the electrically-peelable adhesive layer from at least one of the first conductive layer and the second conductive layer.

[0021] In one embodiment, the step of connecting the first adherend to the first conductive layer through the connection hole of the first adhesive layer further includes:

[0022] Performing laser engraving on the surface of the first adherend to form a conductive area opposite to the connection hole;

[0023] An interface conductivity enhancement treatment is performed on the conductive area to form a conductive enhancement layer on the surface of the conductive area. The conductive enhancement layer is passed through the connection hole and connected to the first conductive layer.

[0024] The embodiments of the present invention provide an electrically releasable adhesive sheet and a joint body, which have the following advantages compared to the prior art:

[0025] The electrically peelable adhesive sheet of the embodiment of the present invention includes an electrically peelable adhesive layer, a first unit layer and a second unit layer, wherein the first unit layer includes a first conductive layer and a first adhesive layer stacked together, the second unit layer includes a second conductive layer and a second adhesive layer stacked together, and the first conductive layer and the second conductive layer are respectively arranged on opposite sides of the electrically peelable adhesive layer. Specifically, the electrically peelable adhesive sheet can be bonded to the first adherend and the second adherend through the first unit layer and the second unit layer, respectively, to achieve assembly and combination of the two. Compared with the method of directly contacting the surface of the metal adherend through the electrically peelable adhesive layer and applying voltage using the metal adherend, the electrically peelable adhesive sheet of the embodiment of the present invention uses the first conductive layer and the second conductive layer to directly apply voltage to the electrically peelable adhesive layer. Since the first conductive layer and the second conductive layer have excellent electrical conductivity, they can ensure the effective conduction of the peeling voltage, thereby ensuring the electrical peeling effect of the electrically peelable adhesive layer, so that the first unit layer and the second unit layer can be smoothly separated when the adhesion force of the electrically peelable adhesive layer decreases, thereby achieving the mutual separation of the first adherend and the second adherend. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the electrically releasable adhesive sheet according to an embodiment of the present invention;

[0027] Figure 2 This invention Figure 1 A cross-sectional view of an electrically releasable adhesive sheet;

[0028] Figure 3 This invention Figure 1 Schematic diagram of application of the electrically releasable adhesive sheet;

[0029] Figure 4 4 is a flow chart of a method for preparing the joint 1000 according to an embodiment of the present invention.

[0030] In the figure, 1000, joint body; 100, electro-peelable adhesive sheet; 10, electro-peelable adhesive layer; 20, first unit layer; 21, first conductive layer; 22, first adhesive layer; 221, connection hole; 30, second unit layer; 31, second conductive layer; 32, second adhesive layer; 200, first adherend; 210, conductive area; 220, conductive reinforcement layer; 300, second adherend. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0032] It should be understood that the present invention uses terms such as "front" and "back" to describe various types of information, but such information should not be limited to these terms. These terms are merely used to distinguish information of the same type from one another. For example, "front" information could also be referred to as "back" information, and "back" information could also be referred to as "front" information without departing from the scope of the present invention.

[0033] like Figures 1 to 3 As shown, an electrically peelable adhesive sheet 100 according to an embodiment of the present invention includes an electrically peelable adhesive layer 10, a first unit layer 20 and a second unit layer 30, wherein both surfaces of the electrically peelable adhesive layer 10, which are arranged opposite to each other in a first direction, are adhesive; the first unit layer 20 includes a first conductive layer 21 and a first adhesive layer 22 stacked along the first direction, wherein the first conductive layer 21 is arranged on one side of the electrically peelable adhesive layer 10 and is bonded to the electrically peelable adhesive layer 10, and the first adhesive layer 22 is arranged on the side of the first conductive layer 21 away from the first adhesive layer 22, and is used to be bonded to a first adherend 200; the second unit layer 30 includes a second conductive layer 31 and a second adhesive layer 32 stacked along the first direction, wherein the second conductive layer 31 is arranged on one side of the electrically peelable adhesive layer 10 and is bonded to the electrically peelable adhesive layer 10, and the second adhesive layer 32 is arranged on the side of the second conductive layer 31 away from the second adhesive layer 32, and is used to be bonded to a second adherend 300. The first conductive layer 21 and the second conductive layer 31 can apply a voltage to the electrically-peelable adhesive layer 10 to reduce the adhesive force of the electrically-peelable adhesive layer 10 , thereby separating the first unit layer 20 and the second unit layer 30 .

[0034] In this embodiment, the electro-peelable adhesive layer 10 may include a polymer as an adhesive and an electrolyte. The type of the polymer may be, but is not limited to, an acrylic polymer or a rubber polymer. The electrolyte may be a substance that can be ionized into anions and cations. Preferably, the electrolyte may be an ionic liquid.

[0035] The electrically-peelable adhesive layer 10 has a bonded state when no voltage is applied and a debonded state when voltage is applied. In the bonded state, both opposite surfaces of the electrically-peelable adhesive layer 10 in a first direction are adhesive and can be bonded to other components. In the debonded state, the adhesive force of the electrically-peelable adhesive layer 10 is reduced, allowing it to be peeled from the adherend. Thus, by controlling the electrical conductivity of the electrically-peelable adhesive layer 10, the electrically-peelable adhesive layer 10 can be switched between the bonded state and the debonded state, so that the electrically-peelable adhesive sheet 100 of the present invention has both adjustable adhesive force and electro-peelable performance.

[0036] The first unit layer 20 includes a first conductive layer 21 and a first adhesive layer 22 stacked together. The second unit layer 30 includes a second conductive layer 31 and a second adhesive layer 32 stacked together. The first conductive layer 21 and the second conductive layer 31 are disposed on opposite sides of the electrically-peelable adhesive layer 10. The first adhesive layer 22 is used to externally contact the first adherend 200, and the second adhesive layer 32 is used to externally contact the second adherend 300. The electrically-peelable adhesive layer 10, in a bonded state, can be bonded to the first conductive layer 21 and the second conductive layer 31, respectively, so that the first adherend 200 bonded to the first adhesive layer 22, the first unit layer 20, the electrically-peelable adhesive layer 10, the second unit layer 30, and the second adherend 300 bonded to the second adhesive layer 32 can be assembled and combined into one body.

[0037] The first conductive layer 21 and the second conductive layer 31 have excellent electrical conductivity. When the first conductive layer 21 and the second conductive layer 31 are connected to an external power source, the external power source can directly apply a voltage to the electro-peelable adhesive layer 10 through the first conductive layer 21 and the second conductive layer 31, thereby causing the electro-peelable adhesive layer 10 to exhibit electrical adhesion reduction characteristics and switch to a debonded state. In other words, the placement of the first conductive layer 21 and the second conductive layer 31 on opposite sides of the electro-peelable adhesive layer 10 ensures effective conduction of the peeling voltage, thereby guaranteeing the electro-peelable adhesive layer 10's electrical peeling effect. This allows the first unit layer 20 and the second unit layer 30 to be smoothly separated when the adhesion of the electro-peelable adhesive layer 10 decreases, thereby achieving separation of the first adherend 200 and the second adherend 300.

[0038] Optionally, in some embodiments, the thickness of the electro-peelable adhesive layer 10 , the first conductive layer 21 , the first adhesive layer 22 , the second conductive layer 31 , and the second adhesive layer 32 are all in the range of 10 μm to 100 μm.

[0039] In one feasible embodiment, the first conductive layer 21 and the second conductive layer 31 of the embodiment of the present invention may include a conductor bonded to the electrically strippable adhesive layer 10. The type of conductor may be, but is not limited to, a metal foil, a metal plating, or the like. The metal foil may be, but is not limited to, aluminum foil, copper foil, or the like. It is understood that, compared to using a metal plating as the conductor, using a metal foil as the conductor not only helps reduce the production cost of the electrically strippable adhesive sheet 100, but also achieves better heat dissipation performance and eliminates the risk of plating falling off, thereby ensuring the structural stability of the electrically strippable adhesive sheet 100. Furthermore, the technical solution of the present invention can also provide auxiliary support for the first conductive layer 21 and the second conductive layer 31 through the first adhesive layer 22 and the second adhesive layer 32, respectively, thereby ensuring the structural strength of the electrically strippable adhesive sheet 100.

[0040] like Figures 1 to 3 As shown, the first adhesive layer 22 of the embodiment of the present invention is provided with a connection hole 221 , which penetrates the first adhesive layer 22 along the first direction and is arranged opposite to the first conductive layer 21 . The first conductive layer 21 is used to connect to the first adherend 200 through the connection hole 221 .

[0041] In this embodiment, the first adherend 200 for bonding with the first adhesive layer 22 can be a conductive adherend. By setting a connection hole 221 through the first adhesive layer 22, the first conductive layer 21 can be easily connected to the first adherend 200, and then the first adherend 200 can be connected to an external power source.

[0042] Of course, the technical solution of the present invention is not limited to this. In other embodiments, the second adherend 300 for bonding with the second adhesive layer 32 may also be a conductive adherend. The second adhesive layer 32 is provided with a connection hole 221. The connection hole 221 penetrates the first adhesive layer 22 along the first direction and is arranged opposite to the second conductive layer 31, so that the second conductive layer 31 can be connected to the second adherend 300 through the connection hole 221, and further, the second adherend 300 can be connected to an external power source. The specific implementation can be customized according to actual needs and is not limited here.

[0043] like Figures 1 to 3 As shown, the size of the connection hole 221 in the embodiment of the present invention is smaller than the size of the electrically-peelable adhesive layer 10 .

[0044] It should be noted that to facilitate connection between the first conductive layer 21 and the first adherend 200 through the connection holes 221 in the first adhesive layer 22, the first adherend 200 may be provided with a conductive region 210 having good conductivity. The size of the conductive region 210 may be adapted to the connection holes 221 and disposed opposite the connection holes 221. When the first adherend 200 is a metal adherend with a dense oxide layer on its surface, the conductive region 210 can be formed on the surface of the first adherend 200 by laser engraving specific areas. By making the size of the connection holes 221 smaller than that of the electrically-peelable adhesive layer 10, the size of the conductive region 210 corresponding to the connection holes 221 can be smaller than that of the electrically-peelable adhesive layer 10, thereby reducing the difficulty of handling the first adherend 200.

[0045] Furthermore, the projection of the connection hole 221 in the embodiment of the present invention falls into the electrically-peelable adhesive layer 10 along the first direction. This arrangement allows the connection hole 221 to be positioned opposite the first conductive layer 21 covering one side of the electrically-peelable adhesive layer 10, thereby facilitating the connection between the first conductive layer 21 and the first adherend 200.

[0046] In the embodiment of the present invention, the projection of the electrically-peelable adhesive layer 10 falls into the first conductive layer 21 and / or within the first conductive layer 21 along the first direction. This configuration allows the electrically-peelable adhesive layer 10 to be slightly smaller than the first conductive layer 21 and the second conductive layer 31 on either side thereof. This ensures that the first conductive layer 21 and the second conductive layer 31 wrap around the electrically-peelable adhesive layer 10, allowing for application of a thickness-direction voltage to the entire area of ​​the electrically-peelable adhesive layer 10, thereby ensuring the electrical peeling effect of the electrically-peelable adhesive layer 10.

[0047] The first adhesive layer 22 and / or the second adhesive layer 32 of the embodiment of the present invention have adhesive properties on both sides opposite to each other in the first direction. In this way, the first adhesive layer 22 and the first conductive layer 21, the second adhesive layer 32 and the second conductive layer 31 can be combined by bonding to form Figure 2 The stacked structure shown.

[0048] The second conductive layer 31 of the embodiment of the present invention includes a substrate and a conductive structure stacked along a first direction. The conductive structure is provided on one side of the electrically-peelable adhesive layer 10 and is bonded to the electrically-peelable adhesive layer 10 .

[0049] In this embodiment, the substrate can be, but is not limited to, PET, non-woven fabric, etc., and the conductive structure can be a metal plating layer. The material of the metal plating layer can be, but is not limited to, copper, aluminum, etc. This configuration can ensure that the second conductive layer 31 has good conductivity while also having good structural strength.

[0050] Of course, the technical solution of the present invention is not limited to this. In other embodiments, the second conductive layer 31 may also be configured as a metal foil, such as, but not limited to, aluminum foil, copper foil, or the like. Alternatively, the second conductive layer 31 may be configured as a structure combining a substrate and a metal foil, such as aluminum foil Mylar. The specific implementation can be customized according to actual needs and is not limited here.

[0051] The present invention also provides a joint 1000 comprising a first adherend 200, a second adherend 300, and an electrically releasable adhesive sheet 100. The specific structure of the electrically releasable adhesive sheet 100 is similar to the aforementioned embodiments. Since this joint 1000 utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects of the technical solutions of the aforementioned embodiments, which will not be further detailed here. The first adherend 200 and the second adherend 300 are disposed on opposite sides of the electrically releasable adhesive sheet 100 and are bonded to the first unit layer 20 and the second unit layer 30, respectively.

[0052] In this embodiment, the bonded body 1000 is an electronic component in an electronic product. For example, in one feasible implementation, the bonded body 1000 may be a mobile phone component, the first adherend 200 may be the middle frame of the mobile phone, and the second adherend 300 may be a battery. A battery compartment for accommodating the battery is formed within the middle frame. The battery can be bonded and fixed within the battery compartment via the electrically releasable adhesive sheet 100, thereby ensuring the stability of the battery assembly. Of course, the technical solution of the present invention is not limited to this. In other embodiments, the bonded body 1000 may also be a tablet component or an electronic component in other electronic products. The specific implementation method can be customized according to actual needs.

[0053] like Figure 2 and Figure 3 As shown, the first adherend 200 of the embodiment of the present invention has a conductive area 210 on the side facing the first unit layer 20, and the first adherend 200 also includes a connection area for connecting to the conductive terminal, and the conductive area 210 is electrically connected to the connection area; the first adhesive layer 22 is provided with a connection hole 221, and the connection hole 221 and the conductive area 210 are arranged opposite to each other. The surface of the conductive area 210 is covered with a conductive reinforcement layer 220, and the conductive reinforcement layer 220 is passed through the connection hole 221 to connect with the first conductive layer 21.

[0054] In this embodiment, the first adherend 200 has a conductive area 210 disposed at the bonding site between it and the electrically-peelable adhesive sheet 100. It also has a connection area, which is positioned away from the bonding site of the electrically-peelable adhesive sheet 100. The connection area can be used to connect an external conductive terminal. The first adherend 200 can be a metal adherend with good conductivity, so that the connection area and the conductive area 210 can be connected and electrically conductive through the first adherend 200 itself.

[0055] Furthermore, when the first adherend 200 is a metal adherend having a dense oxide layer on its surface, the dense oxide layer on the surface of the metal adherend can be removed by laser engraving the side surface of the metal adherend, thereby forming a conductive area 210 with good conductivity on the metal adherend to ensure effective conduction of the peeling voltage.

[0056] In other embodiments, the first adherend 200 may only have a localized structure with good conductivity. For example, the first adherend 200 may have two localized areas on its surface with good conductivity, forming a conductive area 210 and a connection area, respectively. Furthermore, the first adherend 200 may include a conductive structure, such as a wire or a circuit board, within its body, connecting the conductive area 210 and the connection area. This allows the conductive structure to connect the conductive area 210 and the connection area. Of course, the technical solution of the present invention is not limited to this, and the specific implementation method can be customized according to actual needs.

[0057] like Figure 2 and Figure 3 As shown, the surface of the conductive area 210 of the embodiment of the present invention is covered with a conductive reinforcement layer 220 , and the conductive reinforcement layer 220 is arranged along the first direction through the first adhesive layer 22 .

[0058] In this embodiment, by coating the conductive region 210 formed by laser engraving with a conductive enhancement layer 220, the conductive region 210 is enhanced, thereby enhancing interfacial conductivity and protecting the laser engraved region from oxidation. Specifically, the conductive enhancement layer 220 can be formed by coating the conductive region 210 with a conductive adhesive film, applying silver paste, or ultrasonically or laser welding an oxidation-resistant metal sheet. The specific implementation method can be customized based on actual needs and is not limited here.

[0059] The present invention also provides a method for preparing a joint body 1000, which is applied to the joint body 1000. The specific structure of the joint body 1000 is referred to the above embodiment. Figure 4 As shown, the preparation method of the joint body 1000 specifically includes the following steps:

[0060] S10, placing the electrically releasable adhesive sheet 100 between the first adherend 200 and the second adherend 300;

[0061] S20 , laminating the first adhesive layer 22 and the second adhesive layer 32 to the first adherend 200 and the second adherend 300 respectively, and connecting the first adherend 200 to the first conductive layer 21 through the connection hole 221 of the first adhesive layer 22 .

[0062] It should be noted that when the first adherend 200 and the second adherend 300 need to be peeled off, the first adherend 200 and the second conductive layer 31 can be connected to conductive terminals respectively, so that a voltage is applied to the electrically-peelable adhesive layer 10 to peel off the electrically-peelable adhesive layer 10 from at least one of the first conductive layer 21 and the second conductive layer 31.

[0063] For example, when peeling the first adherend 200 and the second adherend 300, the voltage applied to the electrically-peelable adhesive layer 10 ranges from 2V to 50V, and the duration of the application ranges from 2 seconds to 200 seconds. It should be noted that as the applied voltage increases, the time required for the electrically-peelable adhesive layer 10 to transition from a bonded state to a debonded state can be shortened.

[0064] Optionally, in some embodiments, the step of “connecting the first adherend 200 to the first conductive layer 21 through the connection hole 221 of the first adhesive layer 22 ” further includes:

[0065] Performing laser engraving on the surface of the first adherend 200 to form a conductive area 210 disposed opposite to the connection hole 221;

[0066] An interface conductivity enhancement treatment is performed on the conductive area to form a conductive enhancement layer 220 on the surface of the conductive area 210 . The conductive enhancement layer 220 is passed through the connection hole 221 and connected to the first conductive layer 21 .

[0067] For example, when the surface of the first adherend 200 is laser engraved, the depth of the laser engraving may be in a range of 10 nm to 1000 nm, and the thickness of the conductive reinforcement layer 220 may be in a range of 4 μm to 100 μm.

[0068] It should be noted that to ensure effective conduction of the peeling voltage, the area of ​​the conductive area 210 on the first adherend 200 is not less than the area of ​​the connection hole 221, and the conductive area 210 and the connection hole 221 are arranged opposite each other in the first direction. By applying a voltage to the electrically-peelable adhesive layer 10 through the structure of the conductive terminal, the conductive area 210 of the first adherend 200, the conductive reinforcing layer 220, and the first conductive layer 21, and by ensuring low contact resistance between the first conductive layer 21 and the electrically-peelable adhesive layer 10, the electrically-peelable adhesive layer 10 is effectively peeled.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An electrically releasable adhesive sheet, characterized in that include: an electro-peelable adhesive layer; a first unit layer, the first unit layer comprising a first conductive layer and a first adhesive layer stacked along the first direction, the first conductive layer being disposed on one side of the electrically peelable adhesive layer and bonded to the electrically peelable adhesive layer, and the first adhesive layer being disposed on a side of the first conductive layer facing away from the first adhesive layer, and being bonded to a first adherend; as well as The second unit layer includes a second conductive layer and a second adhesive layer stacked along the first direction, the second conductive layer is arranged on one side of the electrically peelable adhesive layer and is bonded to the electrically peelable adhesive layer, and the second adhesive layer is arranged on the side of the second conductive layer away from the second adhesive layer and is used to bond to a second adherend.

2. The electrically releasable adhesive sheet according to claim 1, wherein The first adhesive layer is provided with a connection hole, which penetrates the first adhesive layer along the first direction and is arranged opposite to the first conductive layer. The first conductive layer is connected to the first adherend through the connection hole.

3. The electrically releasable adhesive sheet according to claim 2, wherein The connection hole has a size smaller than that of the electrically-peelable adhesive layer.

4. The electrically releasable adhesive sheet according to claim 3, wherein A projection of the connection hole falls into the electrically-peelable adhesive layer along the first direction.

5. The electrically releasable adhesive sheet according to any one of claims 1 to 4, wherein The projection of the electrically-peelable adhesive layer falls into the first conductive layer and / or within the first conductive layer along the first direction.

6. The electrically releasable adhesive sheet according to any one of claims 1 to 4, characterized in that The second conductive layer includes a substrate and a conductive structure stacked along the first direction. The conductive structure is provided on one side of the electrically peelable adhesive layer and is bonded to the electrically peelable adhesive layer.

7. A conjugate, characterized in that: The electrically peelable adhesive sheet comprises a first adherend, a second adherend, and the electrically peelable adhesive sheet according to any one of claims 1 to 6, wherein the first adherend and the second adherend are arranged on opposite sides of the electrically peelable adhesive sheet and are bonded to the first unit layer and the second unit layer respectively.

8. The joint body according to claim 7, characterized in that The first adherend has a conductive area on a side facing the first unit layer, and the first adherend also includes a connection area for connecting to a conductive terminal, and the conductive area is electrically connected to the connection area; The first adhesive layer is provided with a connection hole, the connection hole and the conductive area are arranged opposite to each other, the surface of the conductive area is covered with a conductive reinforcement layer, and the conductive reinforcement layer is passed through the connection hole to be connected to the first conductive layer.

9. A method for preparing a joint body, wherein the method for assembling the joint body is applied to the joint body according to any one of claims 7 to 8, characterized in that: The following steps are involved: placing an electrically releasable adhesive sheet between the first adherend and the second adherend; The first adhesive layer and the second adhesive layer are respectively attached to the first adherend and the second adherend, and the first adherend is connected to the first conductive layer through the connection hole of the first adhesive layer.

10. The method for preparing a junction according to claim 9, characterized in that: The step of connecting the first adherend to the first conductive layer through the connection hole of the first adhesive layer further includes: Performing laser engraving on the surface of the first adherend to form a conductive area opposite to the connection hole; An interface conductivity enhancement treatment is performed on the conductive area to form a conductive enhancement layer on the surface of the conductive area. The conductive enhancement layer is passed through the connection hole and connected to the first conductive layer.

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