Tape for busbars with fire resistance and insulation

Abstract

The present invention relates to a busbar tape having fire resistance and insulation properties, and more specifically, to a busbar tape comprising a liquid crystal silicone rubber coating layer; a fire-resistant film layer containing mica; and an adhesive layer, which enables operation in a single winding process without the use of a separate adhesive and has fire resistance and insulation properties against high temperature and high voltage.

Description

Technology Field

[0001] The present invention relates to a busbar tape having fire resistance and insulation properties, and more specifically, to a busbar tape comprising a liquid crystal silicone rubber coating layer; a fire-resistant film layer containing mica; and a fire-resistant adhesive layer, which enables operation in a single winding process without the use of a separate adhesive and has fire resistance and insulation properties against high temperature and high voltage. Background Technology

[0003] Bus bars can stably carry large currents even with a relatively small thickness compared to cables, so they are widely used as a means of connection for supplying and distributing power to supply electrical energy in battery modules of electric vehicles.

[0004] Busbars, which are high-voltage charging parts, are provided with insulation by covering them with solid insulators using methods such as dipping, spray coating, powder coating, shrink tubing, and injection molding to prevent electric shock and short circuits caused by direct contact with the human body and structures.

[0005] The dipping process is a relatively simple process in which a bus bar is impregnated into a liquid resin to form an insulating plastic resin film, but it has limitations in that it is difficult to control the thickness and shape of the film and quality variations occur depending on the skill level of the operator.

[0006] In the case of spray coating, liquid paint is applied to the busbar surface using a spray gun, but there is a limitation in that a robust film thickness cannot be achieved, making it susceptible to damage from external impact.

[0007] Due to the limitations of the aforementioned processes, insulating tapes for busbars, which are produced by processing an insulating material into a tape form and wrapping it around a busbar to provide insulation, are attracting attention.

[0008] Busbars are classified into rigid busbars and flexible busbars. The aforementioned flexible busbar is flexible and easily deformed, allowing it to be made into a desired shape; therefore, it can be usefully employed when connecting battery modules located in areas with different vibration axes or complex paths.

[0009] On the other hand, the above-mentioned flexible busbar has a problem in that, in the event of internal ignition of the battery pack, the insulation material may be lost and deformation due to heat may occur, and such deformation may cause contact with surrounding metal objects, thereby inducing a short circuit.

[0010] Due to the aforementioned problems, there is a need to develop a busbar tape that exhibits fire resistance capable of preventing fire spread in the early stages even if a fire occurs due to the loss of insulation on the busbar, and possesses insulation properties against high voltage. The problem to be solved

[0012] The objective of the present invention is to provide a busbar tape having fire resistance and insulation against high voltage that can prevent fire spread in the early stages even if a fire occurs due to the loss of the coating on the busbar, in order to solve the above-mentioned problem.

[0013] In addition, the objective of the present invention is to provide a busbar tape having fire resistance and insulation properties that allows for operation in a single winding process without the use of a separate adhesive and enables long-length winding process operations without replacement.

[0014] In addition, the objective of the present invention is to provide a busbar tape having fire resistance and insulation properties that can be manufactured through a simple process.

[0015] The technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description of the present invention. means of solving the problem

[0017] To achieve the above objective, the present invention provides a tape for a busbar having fire resistance and insulation properties, comprising: a liquid crystal silicone rubber coating layer; a fire-resistant film layer containing mica; and a fire-resistant adhesive layer; wherein the liquid crystal silicone rubber coating layer comprises vinyl / STPD polydimethylsiloxane, aluminum hydroxide, titanium dioxide, 3,6-bis(4-chlorophenyl)-2,5-(dihydropyrrolo(3,4-C)pyrrole-1,4-dione and calcium 4,5-dichloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfonatophenyl)-1H-pyrazole-4-yl]azo]benzenesulfonate; and wherein the fire-resistant adhesive layer comprises an adhesive selected from the group consisting of silicone pressure-sensitive adhesives and acrylic adhesives, a crosslinking agent, a benzoyl peroxide catalyst, and a platinum catalyst.

[0018] In the present invention, the liquid crystal silicone rubber coating layer comprises, per 100 parts by weight of the liquid crystal silicone rubber coating layer, 50 to 59 parts by weight of the vinyl / STPD polydimethylsiloxane, 40 to 49 parts by weight of the aluminum hydroxide, 0.3 to 0.5 parts by weight of the titanium dioxide, 0.1 to 0.3 parts by weight of the 3,6-bis(4-chlorophenyl)-2,5-(dihydropyrrolo(3,4-C)pyrrole-1,4-dione), and 0.5 to 2 parts by weight of the calcium 4,5-dichloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfonatophenyl)-1H-pyrazole-4-yl]azo]benzenesulfonate, and per 100 parts by weight of the fire-resistant adhesive layer comprises, the silicone pressure-sensitive adhesive and the acrylic adhesive It is characterized by comprising 96 to 98 parts by weight of an adhesive selected from one or more of the group consisting of, 0.7 to 1.2 parts by weight of the crosslinking agent, 0.07 to 0.12 parts by weight of the benzoyl peroxide catalyst, and 0.7 to 1.2 parts by weight of the platinum catalyst.

[0019] In the present invention, the tape for the busbar is characterized by having a heat resistance of 1,000 to 1,500 ℃ and a thermal conductivity of 0.1 to 0.3 W / m·K.

[0020] In the present invention, the busbar tape is 5.0 × 10 15 Up to 6.5 × 10 15 Surface resistance of Ω / □ and 1.0 × 10 17 Up to 2.0 × 10 17 It is characterized by having a volume resistivity of Ω·cm.

[0021] In the present invention, the busbar tape is characterized by being usable in a winding process with a length of 1 to 200 M. Effects of the invention

[0023] By means of the solution to the above problem, the present invention can provide a busbar tape having fire resistance and insulation against high voltage that can prevent fire spread in the early stages, in order to solve the above problem.

[0024] In addition, the present invention can provide a busbar tape having fire resistance and insulation properties that allows for operation in a single winding process without the use of a separate adhesive and enables long-length winding process operations without replacement.

[0025] In addition, the present invention can provide a busbar tape having fire resistance and insulation properties that can be manufactured through a simple process.

[0026] In addition, the present invention can provide a busbar tape having fire resistance and insulation properties that enables a winding process cycle, reduction of process time, and cost reduction.

[0027] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0029] FIG. 1 is a drawing showing a busbar tape having fire resistance and insulation properties according to the present invention. FIG. 2 is a drawing showing the structure of a busbar tape having fire resistance and insulation properties according to the present invention. Figure 3 is a drawing showing the lightweight effect of the tape for a busbar according to the present invention. Figure 4 is a diagram showing the results of a fire resistance measurement experiment of a busbar tape according to the present invention. Figure 5 is a diagram showing the results of a surface resistance measurement experiment of a tape for a busbar according to the present invention. FIG. 6 is a drawing showing a test report indicating the performance test results of a busbar tape according to the present invention. Specific details for implementing the invention

[0030] The terms used in this specification have been selected based on currently widely used general terms whenever possible, taking into account their functions in the present invention; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the corresponding description of the invention. Therefore, the terms used in this invention should be defined not merely by their names, but based on their meanings and the overall content of the invention.

[0031] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0032] Numerical ranges include the values ​​defined in the above ranges. All maximum numerical limits given throughout this specification include all lower numerical limits as clearly written. All minimum numerical limits given throughout this specification include all higher numerical limits as clearly written. All numerical limits given throughout this specification will include all better numerical ranges within a wider numerical range, as clearly written.

[0034] Busbar tape with fire resistance and insulation properties

[0035] The present invention relates to a tape for a busbar having fire resistance and insulation properties.

[0036] The above-mentioned tape for the busbar may be configured to wrap the surface of the busbar, excluding both ends, as shown in FIG. 1, to provide fire resistance and insulation.

[0037] The present invention relates to a tape for a busbar having fire resistance and insulation properties, comprising: a liquid crystal silicone rubber coating layer; a fire-resistant film layer containing mica; and a fire-resistant adhesive layer; wherein the liquid crystal silicone rubber coating layer comprises vinyl / STPD polydimethylsiloxane, aluminum hydroxide, titanium dioxide, 3,6-bis(4-chlorophenyl)-2,5-(dihydropyrrolo(3,4-C)pyrrole-1,4-dione and calcium 4,5-dichloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfonatophenyl)-1H-pyrazole-4-yl]azo]benzenesulfonate; and wherein the fire-resistant adhesive layer comprises an adhesive selected from the group consisting of silicone pressure-sensitive adhesives and acrylic adhesives, a crosslinking agent, a benzoyl peroxide catalyst, and a platinum catalyst.

[0038] It may have excellent fire resistance and excellent insulation properties through high surface resistance and volume resistance, including the above liquid crystal silicone rubber coating layer.

[0039] As shown in FIG. 2, the above busbar tape may have a laminated structure comprising the liquid crystal silicone rubber coating layer, the fire-resistant film layer containing mica, and the fire-resistant adhesive layer. The above busbar tape may have excellent fire resistance and excellent insulation properties through high surface resistance and volume resistance, while including the liquid crystal silicone rubber coating layer.

[0040] The above-described busbar tape may include a fire-resistant film layer containing mica, exhibiting a lightweight weight as shown in FIG. 3, and may be capable of being operated in a single winding process without the addition of a separate adhesive tape. The fire-resistant film layer containing mica may exhibit fire resistance and may be usable even at high temperatures. The fire-resistant film layer containing mica may include one or more fire-resistant films selected from the group consisting of fire-resistant silica-based films and non-combustible coated glass films, but is not limited thereto.

[0041] In addition, the adhesion of the adhesive layer may be maintained even at high temperatures by including the above-mentioned fire-resistant adhesive layer.

[0042] In the present invention, the liquid crystal silicone rubber coating layer comprises, per 100 parts by weight of the liquid crystal silicone rubber coating layer, 50 to 59 parts by weight of the vinyl / STPD polydimethylsiloxane, 40 to 49 parts by weight of the aluminum hydroxide, 0.3 to 0.5 parts by weight of the titanium dioxide, 0.1 to 0.3 parts by weight of the 3,6-bis(4-chlorophenyl)-2,5-(dihydropyrrolo(3,4-C)pyrrole-1,4-dione), and 0.5 to 2 parts by weight of the calcium 4,5-dichloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfonatophenyl)-1H-pyrazole-4-yl]azo]benzenesulfonate, and per 100 parts by weight of the fire-resistant adhesive layer comprises, the silicone pressure-sensitive adhesive and the acrylic adhesive It may comprise 96 to 98 parts by weight of an adhesive selected from one or more of the group formed, 0.7 to 1.2 parts by weight of the crosslinking agent, 0.07 to 0.12 parts by weight of the benzoyl peroxide catalyst, and 0.7 to 1.2 parts by weight of the platinum catalyst.

[0043] If the vinyl / STPD polydimethylsiloxane in the liquid crystal silicone rubber coating layer is included in an amount of less than 50 parts by weight, the adhesiveness may be reduced, and if it is included in an amount exceeding 59 parts by weight, there may be a problem with the difficulty of uniform coating on the film.

[0044] If the above aluminum hydroxide is included in an amount of less than 40 parts by weight, the fire resistance of the liquid crystal silicone rubber coating layer may be reduced, and if it is included in an amount exceeding 49 parts by weight, heat curing may not occur, and a problem may arise in which an adhesive layer cannot be formed.

[0045] If the above titanium dioxide is included in an amount of less than 0.3 parts by weight, the durability of the liquid crystal silicone rubber coating layer may be reduced, and if it is included in an amount exceeding 0.5 parts by weight, a problem may arise where the molding process becomes difficult.

[0046] If the above 3,6-bis(4-chlorophenyl)-2,5-(dihydropyrrolo(3,4-C)pyrrole-1,4-dione is included in an amount less than 0.1 parts by weight, the fire resistance of the liquid crystal silicone rubber coating layer may be reduced, and if it is included in an amount exceeding 0.3 parts by weight, heat curing may not occur, and a problem may arise in which an adhesive layer cannot be formed.

[0047] If the above calcium 4,5-dichloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfonatophenyl)-1H-pyrazole-4-yl]azo]benzenesulfonate is included in an amount of less than 0.5 parts by weight, insulation performance may be reduced, and if it is included in an amount exceeding 2 parts by weight, there may be a risk of toxic substances when exposed to high temperatures.

[0048] If one or more adhesives selected from the group consisting of the silicone pressure-sensitive adhesive and the acrylic adhesive are included in the above fire-resistant adhesive layer in an amount of less than 96 parts by weight, the fire resistance and adhesiveness may be reduced, and if they are included in an amount exceeding 98 parts by weight, a curing reaction may not occur.

[0049] If the above crosslinking agent is included in an amount of less than 0.7 parts by weight, the hardness and degree of curing may decrease, and the silicone adhesive layer may not be formed, and if it is included in an amount exceeding 1.2 parts by weight, the adhesive performance may decrease.

[0050] If the above benzoyl peroxide catalyst is included in an amount of less than 0.07 parts by weight, the curing performance may be reduced and the silicone adhesive layer may not be formed, and if it is included in an amount exceeding 0.12 parts by weight, an uneven cured layer may be formed.

[0051] If the above platinum catalyst is included in an amount of less than 0.7 parts by weight, the addition curing reaction does not occur, and the curing performance is reduced, so the above silicone adhesive layer may not be formed; if it is included in an amount exceeding 1.2 parts by weight, an uneven cured layer may be formed due to an excessive addition curing reaction.

[0052] In the present invention, the tape for the busbar may have a thermal resistance of 1,000 to 1,500 ℃ and a thermal conductivity of 0.1 to 0.3 W / m·K.

[0053] The above-described busbar tape has high heat resistance and low thermal conductivity as described above, thereby exhibiting high fire resistance and potentially minimizing damage to the busbar even in the event of a fire in an electric vehicle.

[0054] In the present invention, the busbar tape is 5.0 × 10 15 Up to 6.5 × 10 15 Surface resistance of Ω / □ and 1.0 × 10 17 Up to 2.0 × 10 17 It may have a volume resistivity of Ω·cm. The above-mentioned busbar tape may exhibit excellent insulation properties through such high surface resistance and volume resistivity, thereby preventing problems such as short circuits from occurring even when in contact with other metals.

[0055] The above-mentioned busbar tape exhibits excellent fire resistance and insulation properties simultaneously, thereby protecting the busbar even when exposed to high temperatures due to a fire, and preventing the high-voltage busbar from coming into contact with the outside and causing additional ignition.

[0056] In the present invention, the busbar tape may be usable in a winding process of 1 to 200 M in length. The busbar tape may be usable in a winding process of 1 to 200 M in length without replacement, thereby shortening the process cycle time and process time and enabling cost reduction.

[0058] Examples

[0059] The embodiments of the present invention are described in detail below, but it is obvious that the present invention is not limited by the following embodiments.

[0060] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described in detail below. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. The embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0062] <Example 1> Busbar tape having fire resistance and insulation properties

[0063] A liquid crystal silicone rubber coating composition was prepared by mixing 54 parts by weight of vinyl / STPD polydimethylsiloxane, 44 parts by weight of aluminum hydroxide, 0.4 parts by weight of titanium dioxide, 0.2 parts by weight of 3,6-bis(4-chlorophenyl)-2,5-(dihydropyrrolo(3,4-C)pyrrole-1,4-dione) and 1 part by weight of calcium 4,5-dichloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfonatophenyl)-1H-pyrazole-4-yl]azo]benzenesulfonate based on 100 parts by weight of the total composition.

[0064] In addition, a silicone adhesive composition was prepared by mixing 97.94 parts by weight of silicone pressure adhesive, 0.98 parts by weight of crosslinking agent, 0.098 parts by weight of benzoyl peroxide catalyst, and 0.98 parts by weight of platinum catalyst relative to 100 parts by weight of the total composition.

[0065] The silicone adhesive composition prepared above was applied to one side of a soft mica film and heat-cured to form a silicone adhesive layer. Subsequently, the liquid crystal silicone rubber composition was applied to the other side of the soft mica film and hot-air dried to form a liquid crystal silicone rubber coating layer, thereby finally obtaining a busbar tape having a liquid crystal silicone rubber coating layer, a fire-resistant film layer containing mica, and a fire-resistant adhesive layer.

[0067] <Comparative Example 1> Tape for busbars without a liquid crystal silicone rubber coating layer

[0068] The same method as in Example 1 was prepared, except that a liquid crystal silicone rubber coating layer was not formed.

[0070] <Experimental Example 1> Fire Resistance Measurement Experiment

[0071] The fire resistance was measured by applying high-temperature heat to a part of a busbar to which the busbar tape manufactured according to Example 1 was applied, and the results are shown in Figure 4.

[0072] As shown in Fig. 4, it was confirmed that even when high-temperature heat was applied to a part of the busbar to which the busbar tape of Example 1 was applied, the busbar tape of Example 1 did not peel off and protected the busbar.

[0073] Through the above results, it was confirmed that the busbar tape according to the present invention exhibits excellent fire resistance, enabling protection of the busbar in the event of a fire.

[0075] <Experimental Example 2> Experiment on measuring insulation properties according to the presence or absence of a liquid crystal silicone rubber coating layer

[0076] The breakdown voltage, surface resistance, and volume resistance of the busbar tapes manufactured according to Example 1 and Comparative Example 1 were measured, and the results are shown in Figure 5.

[0077] As shown in FIG. 5, the breakdown voltage of the busbar tape manufactured in Comparative Example 1 was found to be less than 6 kV, and 3.03 × 10 15 Surface resistance of Ω / □ and 8.47 × 10 16 A volume resistivity of Ω·cm was observed.

[0078] On the other hand, the breakdown voltage of the busbar tape manufactured in Example 1 above was found to be less than 6 kV, and 5.97 × 10 15 Surface resistance of Ω / □ and 1.48 × 10⁻⁶ 17 High surface resistance and volume resistance were observed compared to Comparative Example 1 with a volume resistance of Ω·cm.

[0079] Through the above results, it was confirmed that the busbar tape according to the present invention exhibits excellent insulation properties by including a liquid crystal silicone rubber coating layer and displaying high surface resistance and volume resistance. Through this, it was confirmed that the busbar tape can prevent damage to a busbar carrying high voltage due to external contact and protect the busbar.

[0081] <Experimental Example 3> Insulation strength test after fire resistance test

[0082] The busbar tape manufactured in Example 1 was submitted to the Fire Protection Testing and Research Institute to undergo fire resistance testing and subsequent dielectric strength testing in accordance with the IEC 60331-11:2009 and IEC 60331-21:199 test standards.

[0083] The above fire resistance test was conducted through the following steps. (a) Before the test, position the burner approximately 45 mm horizontally and 70 mm vertically below the thermocouple centerline. (b) Use a support to install the busbar tape of Example 1 horizontally and place the burner. (c) Ignite the burner and adjust the flow rates of propane and air. (d) Verify that the thermocouple temperature reading reaches (1,000 ± 100) ℃. (e) Apply a flame for 30 minutes.

[0084] In addition, the above insulation history test was conducted through the following steps. (a) After wrapping aluminum around the outer sheath of the busbar tape of Example 1, which had undergone the fire resistance test, an AC 60 Hz 2,600 V voltage was gradually increased and applied between the aluminum and the conductor for 2 minutes. (b) After the test in item (a), an AC 60 Hz 2,800 V voltage was again gradually increased and applied between the aluminum and the conductor for 2 minutes.

[0085] The performance results of the fire resistance test and subsequent insulation strength test are shown in Figure 6.

[0086] As shown in Figure 6, the insulation strength test results after the fire resistance test showed that the insulation was maintained without insulation breakdown even after applying voltages of 2,600 V and 2,800 V.

[0087] Through the results described above, it was confirmed that the busbar tape according to the present invention exhibits excellent insulation properties, such that insulation breakdown does not occur at high voltages even after exposure to high temperatures of 1,000°C or higher. Through this, it was confirmed that in the event of a fire, it is possible to prevent additional fires, such as short circuits caused by external contact, from occurring in a busbar carrying high voltage.

Claims

Claim 1 Liquid crystal silicone rubber coating layer; fire-resistant film layer containing mica; and a fire-resistant adhesive layer; wherein the liquid crystal silicone rubber coating layer comprises, per 100 parts by weight of the liquid crystal silicone rubber coating layer, 50 to 59 parts by weight of vinyl / STPD polydimethylsiloxane, 40 to 49 parts by weight of aluminum hydroxide, 0.3 to 0.5 parts by weight of titanium dioxide, 0.1 to 0.3 parts by weight of 3,6-bis(4-chlorophenyl)-2,5-(dihydropyrrolo(3,4-C)pyrrole-1,4-dione and 0.5 to 2 parts by weight of calcium 4,5-dichloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfonatophenyl)-1H-pyrazole-4-yl]azo]benzenesulfonate; and wherein the fire-resistant adhesive layer comprises, per 100 parts by weight of the fire-resistant adhesive layer, a silicone pressure-sensitive adhesive and acrylic A busbar tape having fire resistance and insulation properties, comprising 96 to 98 parts by weight of an adhesive selected from the group consisting of one or more adhesives, 0.7 to 1.2 parts by weight of a crosslinking agent, 0.07 to 0.12 parts by weight of a benzoyl peroxide catalyst, and 0.7 to 1.2 parts by weight of a platinum catalyst, having heat resistance of 1,000 to 1,500 ℃ and thermal conductivity of 0.1 to 0.3 W / m·K. Claim 2 delete Claim 3 delete Claim 4 In claim 1, the busbar tape is 5.0 × 10 15 Up to 6.5 × 10 15 Surface resistance of Ω / □ and 1.0 × 10 17 Up to 2.0 × 10 17 A busbar tape having fire resistance and insulation properties, characterized by having a volume resistivity of Ω·cm. Claim 5 In claim 1, the busbar tape is characterized by being usable in a winding process of 1 to 200 M in length, and has fire resistance and insulation properties.

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