Method for producing composite member

Abstract

To provide a method for producing a composite member, with which it is possible to easily form an insulating film having sufficient strength for a base material of a complex shape, tightly adhering to a base material without peeling even when heated at a high temperature, and having excellent insulation property and heat resistance, without needing to wrap a tape or the like and without problems such as uneven winding, gaps, or peeling. A method for producing a composite member (1) having a base material (2) and an insulating film (3) that covers at least a part of the surface of the base material (2), the method comprising: a coating step for applying a first coating material containing a material of a matrix (10) containing a compound having a siloxane bond, and an inorganic material (20) to at least a part of the surface of the base material (2); and a first coating material curing step for curing the first coating material. An insulating film containing a first layer (11) and a second layer (12) is formed by repeating at least the coating step multiple times.

Description

Manufacturing method of composite material

[0001] The present invention relates to a manufacturing method for manufacturing a composite member in which a substrate is coated with an insulating coating.

[0002] Conductive materials, which are metal pieces with insulating coatings formed on their surfaces, are used to electrically connect components. For example, various electronic devices, electric vehicles or hybrid vehicles driven by electric motors, and storage batteries are equipped with power storage devices in which multiple battery cells are connected in series or parallel by conductive bus bars. Furthermore, lithium-ion secondary batteries, which have higher capacity and higher output than lead-acid batteries or nickel-metal hydride batteries, are primarily used as battery cells.

[0003] When a battery cell is charged or discharged, an overcurrent may flow through the bus bar, causing the bus bar to heat up and possibly even burst into flames. Therefore, the bus bar must be heat-resistant as well as insulating. For example, Patent Document 1 (JP-A-2003-125566) describes a bus bar in which a ceramic tape, such as mica tape, is wrapped around a copper bus bar body as a fire-resistant layer.

[0004] Chinese Utility Model No. 216902355

[0005] However, in Patent Document 1, the ceramic tape must be wrapped around the busbar body. Due to spatial limitations in the installation location of the battery cells, the busbar may have a complex shape, making it difficult to wrap the ceramic tape thoroughly around every corner of the busbar body. If the ceramic tape has uneven wrapping or gaps, sufficient insulation and heat resistance cannot be achieved. Furthermore, the adhesive surface of the ceramic tape may peel off. Furthermore, nylon tape is wrapped around the outside of the mica tape as an insulating layer, but nylon tape is sensitive to heat and has heat resistance issues.

[0006] Therefore, an object of the present invention is to provide a method for manufacturing a composite member that does not require a winding operation like ceramic tape, is free from problems such as uneven winding, gaps, and peeling, has sufficient strength for substrates with complex shapes, and adheres to the substrate without peeling even when heated at high temperatures, and can easily form an insulating coating that has excellent insulating properties and heat resistance.

[0007] The above object of the present invention is achieved by the following configuration [1] relating to a method for producing a composite member.

[0008] [1] A method for manufacturing a composite member having a substrate and an insulating coating covering at least a portion of the surface of the substrate, the method comprising: a coating step of coating at least a portion of the surface of the substrate with a first coating material including a matrix material containing a compound having a siloxane bond and an inorganic material; and a first coating material curing step of curing the first coating material, characterized in that at least the coating step is repeated multiple times.

[0009] Furthermore, preferred embodiments of the present invention relating to a method for manufacturing a composite member relate to the following [2] to

[22] .

[0010] [2] The method for manufacturing a composite member according to [1], characterized in that the deposition step and the first coating material hardening step are repeated in this order multiple times.

[0011] [3] The method for manufacturing a composite member according to [2], characterized in that, among the deposition process and the first coating material hardening process, which are repeated multiple times, in at least the final deposition process, the substrate is deposited by immersing it in the first coating material.

[0012] [4] The method for manufacturing a composite member according to [2], characterized in that it comprises, after the first coating material hardening step, a second coating material immersion step of immersing the substrate on which the coating made of the first coating material has been formed into a second coating material made of a matrix material containing a compound having a siloxane bond, and a second coating material hardening step of hardening the second coating material.

[0013] [5] The method for manufacturing a composite member according to [4], characterized in that a second coating material drying step of drying the second coating material is provided between the second coating material immersion step and the second coating material hardening step.

[0014] [6] The method for manufacturing a composite member according to [1], further comprising a first coating material drying step of drying the first coating material after the coating step, wherein the coating step and the first coating material drying step are repeated multiple times in this order before the first coating material hardening step.

[0015] [7] The method for manufacturing a composite member according to [2], characterized in that a first coating material drying step for drying the first coating material is performed between the deposition step and the first coating material hardening step, and the deposition step, the first coating material drying step, and the first coating material hardening step are repeated multiple times in this order.

[0016] [8] The method for manufacturing a composite member according to [7], characterized in that the thickness of the layer formed by carrying out the deposition step, the first coating material drying step, and the first coating material hardening step once each is 50 μm or more and 400 μm or less.

[0017] [9] A method for manufacturing a composite member according to [2], which includes, after the first coating material hardening step, an immersion step of immersing the substrate on which the coating made of the first coating material has been formed into a second coating material made of a matrix material containing a compound having a siloxane bond, and a second coating material hardening step of hardening the second coating material, characterized in that the coating step, the first coating material hardening step, the immersion step, and the second coating material hardening step are repeated multiple times in this order.

[0018]

[10] The method for manufacturing a composite member according to [9], characterized in that it includes a first coating material drying step for drying the first coating material between the deposition step and the first coating material hardening step, and a second coating material drying step for drying the second coating material between the immersion step and the second coating material hardening step.

[0019]

[11] The method for manufacturing a composite member according to

[10] , characterized in that the thickness of the layer formed by carrying out each of the steps from the deposition step to the second coating material hardening step once is 50 μm or more and 400 μm or less.

[0020]

[12] The method for producing a composite member according to any one of [1] to

[11] , wherein the insulating coating is formed to a thickness of 150 μm or more and 800 μm or less.

[0021]

[13] A method for producing a composite member according to any one of [1] to

[12] , characterized by comprising a resin layer forming step of applying a resin material containing a resin different from the matrix material to at least a portion of the surface and curing the resin material to form a resin layer.

[0022]

[14] The method for producing a composite member according to any one of [1] to

[13] , characterized in that, before the deposition step, a blasting treatment step is performed on the base material so that the surface roughness Ra is 1 μm or more.

[0023]

[15] The method for manufacturing a composite member according to any one of [1] to [3] and [6] to [8], wherein the compound having a siloxane bond contained in the first coating material is at least one of silicone and silica sol.

[0024]

[16] The method for producing a composite member according to any one of [4], [5], and [9] to

[11] , characterized in that the compound having a siloxane bond contained in each of the first coating material and the second coating material is at least one of silicone and silica sol.

[0025]

[17] The method for producing a composite member according to any one of [1] to

[16] , wherein the inorganic material contains at least one selected from silica, alumina, mullite, and zirconia.

[0026]

[18] The method for producing a composite member according to any one of [1] to

[16] , characterized in that the inorganic material contains at least one selected from glass-based materials, mica, kaolin, talc, clay, pyrophyllite, montmorillonite, bentonite, wollastonite, xonotlite, zeolite, diatomaceous earth, and halloysite.

[0027]

[19] The method for producing a composite member according to any one of [1] to

[18] , wherein the inorganic material contains at least one selected from the group consisting of flake-shaped, fibrous, and particulate inorganic materials.

[0028]

[20] The method for producing a composite member according to any one of [1] to

[13] , wherein the inorganic material contains at least one of a glass flake material and mica.

[0029]

[21] The method for manufacturing a composite material according to any one of [1] to

[20] , wherein the composite material is used as a bus bar that connects a plurality of battery cells or battery modules.

[0030]

[22] The method for producing a composite material according to any one of [1] to

[20] , wherein the composite material is applied to a connector, a protective part for a battery module, a case for an electronic component, a battery cell, a battery module, a battery pack, or a motor coil.

[0031] The method for producing a composite member of the present invention forms an insulating coating on at least a portion of the surface of a substrate by applying a coating material, eliminating the need for operations such as wrapping tape, and eliminating problems such as uneven wrapping, gaps, and peeling, making it possible to form an insulating coating with sufficient strength on substrates with complex shapes. Furthermore, the method for producing a composite member of the present invention repeats the application step multiple times to obtain the desired thickness, making it easy to form an insulating coating that adheres to the substrate without peeling, even when heated at high temperatures, and has excellent insulating properties and heat resistance.

[0032] FIG. 1A is a diagram showing the process steps of a method for manufacturing a composite member according to a first embodiment of the present invention, and is a schematic diagram showing a first coating step. FIG. 1B is a diagram showing the process steps of a method for manufacturing a composite member according to the first embodiment of the present invention, and is a schematic diagram showing a second coating step. FIG. 1C is a diagram showing the process steps of a method for manufacturing a composite member according to the first embodiment of the present invention, and is a schematic diagram showing a first coating material hardening step. FIG. 1D is a diagram showing the process steps of a method for manufacturing a composite member according to the first embodiment of the present invention, and is a schematic diagram showing a second coating material immersion step. FIG. 1E is a diagram showing the process steps of a method for manufacturing a composite member according to the first embodiment of the present invention, and is a schematic diagram showing a resin layer formation step. FIG. 2A is a diagram showing the process steps of a method for manufacturing a composite member according to a second embodiment of the present invention, and is a schematic diagram showing a first coating step. FIG. 2B is a diagram showing the process steps of a method for manufacturing a composite member according to the second embodiment of the present invention, and is a schematic diagram showing a first first coating material hardening step. FIG. 2C is a diagram showing the process steps of a method for manufacturing a composite member according to the second embodiment of the present invention, and is a schematic diagram showing a first coating material immersion step. FIG. 2D is a diagram showing the process sequence of a method for manufacturing a composite member according to a second embodiment of the present invention, and is a schematic diagram showing a second first coating material hardening step. FIG. 2E is a diagram showing the process sequence of a method for manufacturing a composite member according to the second embodiment of the present invention, and is a schematic diagram showing a second coating material immersion step. FIG. 2F is a diagram showing the process sequence of a method for manufacturing a composite member according to the second embodiment of the present invention, and is a schematic diagram showing a resin layer formation step. FIG. 3A is a diagram showing the process sequence of a method for manufacturing a composite member according to a third embodiment of the present invention, and is a schematic diagram showing a first coating step. FIG. 3B is a diagram showing the process sequence of a method for manufacturing a composite member according to the third embodiment of the present invention, and is a schematic diagram showing a first first coating material hardening step. FIG. 3C is a diagram showing the process sequence of a method for manufacturing a composite member according to the third embodiment of the present invention, and is a schematic diagram showing a first second coating material immersion step. FIG. 3D is a diagram showing the process sequence of a method for manufacturing a composite member according to the third embodiment of the present invention, and is a schematic diagram showing a second immersion step. FIG. 3E is a diagram showing the process sequence of a method for manufacturing a composite member according to the third embodiment of the present invention, and is a schematic diagram showing a second first coating material hardening step.Figure 3F is a diagram showing the process steps of a method for manufacturing a composite member according to a third embodiment of the present invention, and is a schematic diagram showing a second second coating material immersion step. Figure 3G is a diagram showing the process steps of a method for manufacturing a composite member according to a third embodiment of the present invention, and is a schematic diagram showing a resin layer formation step. Figure 4 is a photograph showing an example of a composite member obtained by the method for manufacturing a composite member according to the third embodiment. Figure 5 is a photograph showing another example of a composite member obtained by the method for manufacturing a composite member according to the third embodiment. Figure 6 is a perspective view showing a busbar manufactured by the method for manufacturing a composite member according to an embodiment of the present invention.

[0033] The present inventors conducted extensive research to obtain a composite member that can solve the above problems without using an insulating tape such as ceramic tape. As a result, they discovered that a composite coating can be easily produced even when a substrate having a complex shape is used by applying an insulating coating material to the surface of the substrate and then coating the surface of the substrate with the insulating coating.

[0034] Furthermore, the inventors conducted extensive research to obtain an insulating coating having sufficient strength and found that it is effective to form an insulating coating having the desired thickness by repeating the process of applying to a substrate a first coating material having a matrix containing a compound having a siloxane bond and an inorganic material.

[0035] Examples of compounds having a siloxane bond (Si—O—Si bond) include silicone and silica sol (silica: SiO ２ From the viewpoint of excellent heat resistance and insulating properties, the compound having a siloxane bond contained in each of the first coating material and the second coating material described below is preferably at least one of silicone and silica sol, and more preferably silicone. It is also preferable that each of the first coating material and the second coating material contains both silicone and silica sol.

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and can be implemented with any modifications within the scope of the gist of the present invention.

[0037] 1A to 1E are schematic diagrams showing the steps of a method for manufacturing a composite member according to a first embodiment of the present invention. Note that, in the manufacturing method described below, the case where the compound having a siloxane bond contained in each of the first coating material and the second coating material is silicone is described, but the same is also applicable to the case where the compound having a siloxane bond is silica sol (silica).

[0038] 1A , first, a first coating material is applied to at least a portion of the surface of the substrate 2. The first coating material is, for example, an organic solvent to which a matrix 10 material containing silicone (a compound having a siloxane bond) and an inorganic material 20 have been added, and this will be described in detail later.

[0039] (First Coating Material Drying Step) After the above-mentioned coating step, the first coating material is dried at a temperature of, for example, 50° C. In this first coating material drying step, the organic solvent is volatilized to form the first layer 11.

[0040] <Formation of Second Layer> (Second Coating Process) Thereafter, as shown in Fig. 1B, the first coating material is again laminated on the surface of the first layer 11. This first coating material is the same material as that used in the first coating process.

[0041] (Second First Coating Material Drying Step) After the second coating step, the first coating material is dried, for example, at a temperature of 50° C. This second first coating material drying step volatilizes the organic solvent in the first coating material applied in the second coating step, thereby forming the second layer 12.

[0042] 1C, the first layer 11 and the second layer 12 made of the dried first coating material are then heated to a temperature of, for example, 200°C to harden them. This hardening process causes the silicone to dehydrate and condense, forming a three-dimensional network structure. This hardening process forms numerous pores 30 in the first layer 11 and the second layer 12.

[0043] <Formation of Third Layer (Surface Layer)> (Second Coating Material Immersion Step) Then, as shown in FIG. 1D , the substrate 2 on which the first layer 11 and the second layer 12 have been formed is immersed in a second coating material. The second coating material does not contain an inorganic material 20, but is an organic solvent to which a matrix 10 material containing silicone (a compound having a siloxane bond) has been added. This second coating material immersion step fills some of the numerous pores 30 formed in the first layer 11 and the second layer 12 with the second coating material, thereby reducing the porosity of the first layer 11 and the second layer 12. Furthermore, excess second coating material not absorbed into the pores 30 remains on the surface of the second layer 12.

[0044] (Second Coating Material Drying and Curing Process) The second coating material is then dried, for example, at 50°C, and then heated and cured, for example, at 200°C. This forms a third layer 23 made of a silicone-containing matrix 10 material on the surface of the second layer 12, resulting in a composite member 1 having an insulating coating 3 made of the first layer 11, the second layer 12, and the third layer 23. In the present invention, the second coating material may be cured without drying, but performing the drying process can prevent the resulting layer from expanding during the curing process. Therefore, performing the drying process is preferred.

[0045] (Resin Layer Forming Step) In this embodiment, a resin layer may be formed as needed. As shown in FIG. 1E , a resin material containing a resin different from the material of the matrix 10, such as an epoxy resin paint, may be applied to the surface of the third layer 23, i.e., the surface of the insulating coating 3, and then dried and cured to form the resin layer 7. This forms a composite member 1 having the insulating coating 3 and the resin layer 7 on the substrate 2. When forming the resin layer 7, some of the material constituting the resin layer 7 may penetrate into the first layer 11, the second layer 12, and the third layer 23.

[0046] According to the manufacturing method for a composite member according to the first embodiment, the substrate 2 is not insulated by wrapping tape around it, but rather an insulating coating material is applied to the surface of the substrate 2, forming an insulating coating 3 that adheres closely to the substrate 2. Therefore, when manufacturing the composite member 1 according to this embodiment, no wrapping operation is required, and there are no problems such as uneven winding, gaps, or peeling, and the insulating coating 3 can be easily formed even on complex shapes. Furthermore, the first layer 11 and the second layer 12 that make up the insulating coating 3 have a matrix 10 containing silicone and an inorganic material 20. The silicone contained in the matrix material is heated during the curing process of the coating material in the manufacturing method according to this embodiment, which causes functional groups to disappear and SiO bonds to be formed. Furthermore, if a flame or the like occurs near the composite member and the insulating coating 3 is heated to a temperature of, for example, 700°C or higher, the silicone will thermally decompose to form SiO ２ is generated. Then, this SiO ２ Since the inorganic material 20 does not burn even when exposed to flames, the insulating coating 3 containing silicone can have excellent heat resistance. Furthermore, since the inorganic material 20 has a high melting point and excellent heat resistance, the insulating coating 3 as a whole can have improved heat resistance by including the inorganic material 20 in the first layer 11 and the second layer 12 that constitute the insulating coating 3.

[0047] Furthermore, according to this embodiment, the coating process of applying the first coating material is repeatedly performed, allowing the insulating coating 3 to be formed to a desired thickness. By applying the first coating material to the surface multiple times to increase the thickness, an insulating coating having sufficient strength and excellent insulating and heat-resistant properties can be easily formed, adhering to the substrate without peeling even when heated at high temperatures. The first layer 11 and second layer 12 formed after the first coating material curing process shown in FIG. 1C may also serve as the insulating coating 3. When only the first coating material is repeatedly applied, the first coating material may be applied by painting or immersion. However, in the final coating process, it is preferable to immerse the substrate on which the previous coatings have been formed into the first coating material. This allows the matrix 10 material to efficiently fill the pores 30 inside the layer formed by the first coating material.

[0048] In the first embodiment, the second coating material does not contain the inorganic material 20 of the first coating material. Since the second coating material contains silicone, the amount of silicone in the first layer 11 and the second layer 12 increases by the second coating material immersion step, resulting in the formation of SiO ２ The heat resistance is also increased, and the heat resistance can be maintained more effectively when exposed to flames.

[0049] Furthermore, in this embodiment, the excess second coating material not absorbed into the pores 30 during the second coating material immersion step remains on the surface of the second layer 12, forming a third layer 23. Unlike the first layer 11 and the second layer 12, the third layer 23 does not contain the inorganic material 20, but is composed only of the material of the matrix 10. Therefore, the third layer 23 has high adhesion to the second layer 12 and is harder and denser than the first layer 11 and the second layer 12, thereby providing the effect of protecting the surfaces of the first layer 11 and the second layer 12. Therefore, forming the third layer 23 on at least a portion of the surface can suppress damage to the surface of the second layer 12 and cushion the impact of a colliding object. Furthermore, the formation of the third layer 23 can also provide the effect of preventing powder shedding of the inorganic material 20, etc.

[0050] However, in the present invention, it is not necessarily required to form the third layer 23. The immersion conditions in the second coating material immersion step can be adjusted so that no excess second coating material is present on the surface of the second layer 12. In this case, the third layer 23 shown in FIG. 1D is not formed, and the resin layer 7 is formed on the second layer 12. Furthermore, in the present invention, it is not necessarily required to form the resin layer 7. Thus, even when the third layer 23 or the resin layer 7 is not formed, according to this embodiment, a composite coating having an insulating coating 3 with excellent heat resistance and insulating properties can be easily produced.

[0051] Furthermore, in the first embodiment described above, the series of steps of applying the coating material and drying the first coating material are repeated twice, but they may be repeated multiple times until the desired film thickness is achieved. By repeating the series of steps two or more times, the insulating coating 3 can approach the desired film thickness, further improving the heat resistance and insulating properties.

[0052] In the manufacturing method according to the first embodiment described above, the first coating material (coating liquid) is an organic solvent to which a silicone-containing matrix 10 material and an inorganic material 20 have been added, and the second coating material (coating liquid) is an organic solvent to which a silicone-containing matrix 10 material has been added, without including the inorganic material 20. However, depending on the types of the first and second coating materials, such as silica sol (silica), the composite member of the present invention can be obtained without performing the immersion step. The same applies to the manufacturing methods according to the second and third embodiments described below.

[0053] 2A to 2F are schematic diagrams showing the steps of a method for manufacturing a composite member according to a second embodiment of the present invention. In Fig. 2A to Fig. 2F, the same components as those shown in Fig. 1A to Fig. 1E are denoted by the same reference numerals, and detailed descriptions thereof will be omitted or simplified.

[0054] 2A, first, a first coating material is applied to at least a portion of the surface of the substrate 2. The first coating material is the same as that in the first embodiment, and will be described in detail later.

[0055] 2B , the first coating material is dried at a temperature of, for example, 50° C. (first coating material drying step), and then heated at a temperature of, for example, 200° C. to harden it (first coating material hardening step). This step forms the first layer 11 having numerous pores 30.

[0056] In this embodiment, the thickness of the first layer 11 formed by performing the deposition step, the first coating material drying step, and the first coating material curing step once each is not particularly limited. For example, when applying the first coating material to the substrate surface, it is preferable to have a thickness that can be easily formed in a single application, so that the thickness is preferably 50 μm or more, and more preferably 100 μm or more. On the other hand, if the thickness of the first layer 11 is too thick, it becomes difficult to sufficiently fill some of the pores 30 formed in the first layer 11 with the material of the matrix 10 in the step of forming the second layer 12 described below. Therefore, the thickness of the first layer 11 is preferably 400 μm or less, and more preferably 300 μm or less.

[0057] <Formation of Second Layer> (First Coating Material Immersion Step) Then, as shown in FIG. 2C , the substrate on which the first layer 11 has been formed is immersed in the first coating material. This first coating material is the same material as that used in the first coating step. Through this first coating material immersion step, part of the matrix 10 material from the first coating material penetrates into the pores 30 of the first layer 11, reducing the number of pores 30 in the first layer 11. In addition, a second layer 12 made of the first coating material is laminated on top of the first layer 11.

[0058] 2D , the second layer 12 made of the first coating material is dried at a temperature of, for example, 50° C. (first coating material drying step), and then heated at a temperature of, for example, 200° C. to harden it (first coating material hardening step). This step forms numerous pores 30 in the second layer 12.

[0059] <Formation of Third Layer (Surface Layer)> (Second Coating Material Immersion Step) Then, as shown in FIG. 2E , similar to the first embodiment, the substrate 2 on which the first layer 11 and the second layer 12 have been formed is immersed in the second coating material, which is then dried (second coating material drying step) and hardened (second coating material hardening step). This second coating material immersion step is similar to the second coating material immersion step of the first embodiment, and as a result, the second coating material fills some of the pores 30 in the second layer 12, reducing the porosity of the second layer 12. Furthermore, excess second coating material remains on the surface of the second layer 12, forming the third layer 23. This results in a composite member 1 having an insulating coating 3 consisting of the first layer 11, the second layer 12, and the third layer 23.

[0060] (Resin Layer Forming Process) As in the first embodiment, a resin layer may be formed as needed in the second embodiment. As shown in Fig. 2F, a resin layer 7 containing, for example, an epoxy resin may be formed on the surface of the insulating coating 3, thereby forming a composite member 1 having the insulating coating 3 and the resin layer 7 on the substrate 2. When forming the resin layer 7, part of the material constituting the resin layer 7 may permeate into the first layer 11, the second layer 12, and the third layer 23.

[0061] The method for manufacturing a composite member according to the second embodiment can also achieve the same effects as those of the first embodiment. Furthermore, in this embodiment, the steps of curing the first coating material and then depositing the next layer are repeated in this order, so that the pores 30 formed by curing are sufficiently filled with the matrix material of the second layer. This reduces the porosity (the proportion of pores 30 in the insulating coating 3) and prevents a gradient in porosity from occurring in the thickness direction of the insulating coating 3, further improving the strength of the insulating coating 3.

[0062] In the present invention, the first layer 11 and the second layer 12 after the second drying and curing step of the first coating material shown in FIG. 2D may be used as the insulating coating 3. When the application and curing or application, drying, and curing steps of the first coating material are repeated, the first coating material may be applied entirely by painting or entirely by immersion. However, in order to efficiently fill the pores 30 with the matrix material, it is preferable to immerse the substrate 2 on which multiple layers have been formed into the first coating material at least in the final application step of the first coating material.

[0063] Furthermore, the first and second drying steps of the first coating material and the step of drying the second coating material are not necessarily required. For example, as shown in the second embodiment, the coating material may be dried after each application step and immersion step, or before the final curing step. By performing the drying step before the curing step, it is possible to prevent the resulting layer from expanding during the curing step.

[0064] 3A to 3G are schematic diagrams showing the steps of a method for manufacturing a composite member according to a third embodiment of the present invention. In FIGS. 3A to 3G, the same components as those shown in FIGS. 1A to 1E and 2A to 2F are designated by the same reference numerals, and detailed descriptions thereof will be omitted or simplified.

[0065] 3A, first, a first coating material is applied to at least a portion of the surface of the substrate 2. The first coating material is the same as that in the first embodiment, and will be described in detail later.

[0066] (First Coating Material Drying and Curing Process: First Time) Next, as shown in Fig. 3B, the first coating material is dried (first coating material drying process) and then cured (first coating material curing process). This process forms the first layer 11 having numerous pores 30.

[0067] <Formation of Second Layer> (Second Coating Material Immersion Step: First Time) Then, as shown in FIG. 3C , the substrate 2 on which the first layer 11 has been formed is immersed in the second coating material. This second coating material immersion step fills some of the numerous pores 30 formed in the first layer 11 with the second coating material, thereby reducing the porosity of the first layer 11. Furthermore, excess second coating material not absorbed into the pores 30 remains on the surface of the first layer 11. Then, the second coating material is dried at a temperature of, for example, 50°C (second coating material drying step), and then heated to a temperature of, for example, 200°C to harden it (second coating material hardening step). This forms a second layer 22 made of the silicone-containing matrix 10 material on the surface of the first layer 11.

[0068] Here, the total thickness of the first layer 11 and the second layer 22 formed by performing each of the steps from the deposition step to the second coating material curing step once is not particularly limited. However, if the total thickness of the first layer 11 and the second layer 22 is 50 μm or more, a thicker, stronger layer can be formed than a layer formed by a single application. Therefore, the total thickness of the first layer 11 and the second layer 22 is preferably 50 μm or more, and more preferably 100 μm or more. On the other hand, if the total thickness of the first layer 11 and the second layer 22 is 400 μm or less, a portion of the pores 30 formed in the first layer 11 can be sufficiently filled with the material of the matrix 10 in the step of forming the second layer 22. Therefore, the total thickness of the first layer 11 and the second layer 22 is preferably 400 μm or less, and more preferably 300 μm or less.

[0069] <Formation of Third Layer> (Second Coating Process) Thereafter, as shown in Fig. 3D, the first coating material is again laminated on the surface of the second layer 22. This first coating material is the same material as that used in the first coating process.

[0070] (First Coating Material Drying Step: Second Time) After the second coating step, the first coating material is dried, for example, at a temperature of 50° C. This second first coating material drying step volatilizes the organic solvent in the first coating material applied in the second coating step.

[0071] 3E, the dried first coating material is then heated and cured at a temperature of, for example, 200° C. By this second first coating material curing step, a third layer 13 having a large number of pores 30 is formed.

[0072] <Formation of Fourth Layer (Surface Layer)> (Second Coating Material Immersion Step) Then, as shown in FIG. 3F , the substrate 2 on which the first to third layers 11 to 13 have been formed is immersed in a second coating material. The second coating material is the same material as that used in the first second coating material immersion step. This second second coating material immersion step fills some of the numerous pores 30 formed in the third layer 13 with the second coating material, reducing the porosity of the third layer 13. Furthermore, any second coating material not absorbed into the pores 30 remains on the surface of the third layer 13. The second coating material is then dried (second coating material drying step) and cured by heating (second coating material curing step). This forms a fourth layer 24 made of the silicone-containing matrix 10 material on the surface of the third layer 13.

[0073] The immersion times in the first and second immersion steps are not particularly limited. For example, by adjusting the immersion time to a predetermined time or less, conditions can be adopted that prevent the formation of the second layer 22 and the fourth layer 24 made of the second coating material on the surfaces of the first layer 11 and the third layer 13. The immersion time can also be adjusted so that the second layer 22 is not formed on the surface of the first layer 11, but only the fourth layer 24 is formed on the surface of the third layer 13. Among the multiple repeated second coating material immersion steps, it is preferable to select immersion conditions so that a layer made of the second coating material (the fourth layer 24 in FIG. 3F ) is formed on the surface only in the final second coating material immersion step. In this case, the fourth layer 24 made only of the second coating material has high adhesion to the third layer 13 and has a harder and denser structure than the first layer 11 and the third layer 13. This effectively protects the surface of the third layer 13, suppressing damage to the surface of the third layer 13 and mitigating the impact of a colliding object. Furthermore, the formation of the fourth layer 24 can also provide the effect of preventing powder falling off of the inorganic material 20 and the like in the third layer 13 .

[0074] 3G, the resin layer 7 is formed on the fourth layer 24. When the resin layer 7 is formed, a part of the material constituting the resin layer 7 may penetrate into the layer below it.

[0075] The method for manufacturing a composite member according to the third embodiment can also achieve the same effects as those of the first and second embodiments. Furthermore, as shown in FIG. 3F , when layers containing the matrix 10 material and the inorganic material 20 and dense layers made of the second coating material that does not contain the inorganic material 20 are repeatedly stacked, even better insulating properties can be obtained. On the other hand, even when a layer made of the second coating material is not formed between layers made of the first coating material, the process of immersing the composite member in the second coating material and filling the pores 30 with the second coating material can reduce the porosity of the entire layer, thereby forming an insulating coating 3 that is strong and maintains insulating properties and heat resistance.

[0076] As in the first and second embodiments, the drying step of each layer does not necessarily have to be performed, but by performing the drying step, it is possible to prevent the layers from expanding in the subsequent curing step.

[0077] In the first to third embodiments, the thickness of the insulating coating 3 obtained is not particularly limited. However, a thickness of 150 μm or greater can provide an insulating coating 3 with sufficiently excellent insulation and heat resistance and high strength. Therefore, it is preferable to form the insulating coating 3 to a thickness of 150 μm or greater, and it is more preferable to form the insulating coating 3 to a thickness of 200 μm or greater. On the other hand, if the insulating coating 3 is 800 μm or less, it is possible to prevent a decrease in strength due to an excessively thick insulating coating 3, it is easier to control the size of the composite member, and it is also possible to suppress increases in manufacturing costs. Therefore, it is preferable to form the insulating coating 3 to a thickness of 800 μm or less, and it is more preferable to form the insulating coating 3 to a thickness of 600 μm or less.

[0078] In the first to third embodiments described above, a blasting step is preferably performed on the substrate 2 before the coating step in which the first coating material is applied to the surface of the substrate 2. There are no particular restrictions on the surface roughness of the substrate 2 obtained by the blasting step, but if the surface roughness Ra of the substrate 2 is 1 μm or greater, the bonding area between the substrate 2 and the first layer 11 is increased, thereby ensuring sufficient adhesion between them and preventing peeling of the insulating coating 3. Therefore, the blasting step is preferably performed so that the surface roughness Ra of the substrate is 1 μm or greater, and more preferably so that the surface roughness Ra is 2 μm or greater.

[0079] The surface roughness Ra of the substrate 2 can be measured in accordance with JIS B 0031. In this embodiment, the surface roughness Ra represents an average value of surface roughness measured at any three points on the surface of the substrate 2.

[0080] Next, the material that constitutes the insulating coating 3 in the manufacturing method of the composite member according to the first to third embodiments will be described in more detail.

[0081] (Compound having siloxane bonds: silicone) Silicone, which is a suitable example of a compound having siloxane bonds and is contained in the matrix material, is heated in the curing step of the coating material in the manufacturing method according to the embodiment of the present invention, whereby functional groups disappear and SiO bonds are generated. Furthermore, if a fire or the like occurs near the composite member and the insulating coating 3 is heated to a temperature of, for example, 700°C or higher, the silicone will be thermally decomposed to form SiO ２ is generated. Then, this SiO ２ Since the insulating coating 3 containing silicone is not burned even when exposed to flames, the insulating coating 3 can obtain excellent heat resistance. Therefore, even when the composite member 1 manufactured by the manufacturing method according to the embodiment of the present invention is heated at high temperatures, the insulating coating 3 adheres to the substrate 2 without peeling off, and excellent insulating properties and heat resistance can be maintained. Silicone includes silicone resin and silicone rubber, and either can be used, but selecting silicone resin is preferable because the SiO formed ２ This is preferable from the viewpoint of increasing the density.

[0082] (Inorganic Material) Inorganic material 20 contained in the first coating material has a high melting point and excellent heat resistance, and therefore, including inorganic material 20 in the first coating material constituting insulating coating 3 can improve the heat resistance of the entire insulating coating 3. Furthermore, in the layer containing inorganic material 20, inorganic material 20 can also function as a skeleton, thereby improving the strength of the entire insulating coating 3.

[0083] The inorganic material 20 preferably contains a silicate compound. As described above, silicone, which is an example of a compound having a siloxane bond, is thermally decomposed to form SiO ２ However, silicate compounds can be converted into SiO ２ Since the silicate compound has the same components as those of the silicone matrix 10, it is possible to improve the bonding strength between the silicone matrix 10 and the inorganic material 20. The silicate compound preferably contains at least one selected from glass-based materials, mica, kaolin, talc, clay, pyrophyllite, montmorillonite, bentonite, wollastonite, xonotlite, zeolite, diatomaceous earth, and halloysite.

[0084] The main component of silica sol (silica), which is another suitable example of a compound having a siloxane bond, is SiO ２ and the silicate compound is silica sol (SiO ２ ), the bonding strength between the matrix 10 containing silica sol (silica) and the inorganic material 20 can also be improved.

[0085] It is also preferable that the inorganic material 20 contains at least one selected from silica, alumina, mullite, and zirconia. These materials have high melting points and high insulating properties. Therefore, including these materials in the layers constituting the insulating coating 3 can further improve the heat resistance and insulating properties of the insulating coating 3 as a whole. When a busbar is used as an example of the composite member of the present invention, the expected heat exposure temperature of the busbar is equal to or higher than the melting point of the metal material typically used in the body of a busbar. In this embodiment, when silica, alumina, mullite, zirconia, or the like is included as the inorganic material 20, these materials have melting points equal to or higher than the heat exposure temperature, thereby preventing the busbar body from being exposed to high heat. Therefore, these materials are suitable for use as materials for the insulating coating 3 of a busbar.

[0086] The shape of inorganic material 20 preferably includes at least one selected from flakes, fibers, and particles. When inorganic material 20 has such a shape, the adhesive strength between inorganic material 20 and matrix 10 is increased when inorganic material 20 is dispersed in matrix 10, thereby improving the strength of insulating coating 3.

[0087] Furthermore, when the inorganic material 20 includes a glass-based material, it is preferable to use at least one selected from a flaky glass-based material, glass particles, and glass fibers as the glass-based material. Among these, the flaky glass-based material is oriented in a planar shape inside the insulating coating 3 and exhibits excellent insulating properties and heat resistance. Therefore, it is particularly preferable that the glass-based material includes a flaky glass-based material. Furthermore, for the same reasons as for the flaky glass-based material, it is particularly preferable that mica be used as the inorganic material 20.

[0088] The content of inorganic material 20 relative to all components in the first coating material is preferably 3 to 70 volume %, more preferably 10 to 50 volume %, and even more preferably 20 to 40 volume %. If the content of inorganic material 20 is less than 3 volume %, sufficient insulation and heat resistance may not be obtained. On the other hand, if the content exceeds 70 volume %, the viscosity of the coating liquid used for dip coating becomes too high, resulting in poor film-forming properties.

[0089] (Other Materials) The first coating material for forming the insulating coating 3 may contain, in addition to the above-described matrix 10 and inorganic material 20, other materials such as a flame retardant, a dispersant, or a pigment, as long as the materials do not affect the insulating properties or heat resistance. As described above, the first layer 11 is formed by applying the first coating material (coating liquid) to the surface of the substrate. However, in order to improve the application performance of the first coating material containing the material of the matrix 10 and the inorganic material 20, it is preferable that the first coating material contain a thixotropic agent.

[0090] As with the first coating material, the second coating material may also contain other materials such as flame retardants, dispersants, and pigments, as long as they do not affect the insulating properties or heat resistance.

[0091] <Resin Layer> In the method for manufacturing a composite material according to an embodiment of the present invention, when a resin layer 7 is formed on at least a portion of the surface, an insulating resin can be used as the material for the resin layer 7, and examples of such materials include epoxy resin, nylon resin, SBR (styrene butadiene rubber), silicone rubber, etc. When the composite material 1 has the resin layer 7, the insulating properties and heat resistance can be further improved.

[0092] (Thickness of Resin Layer) When forming the resin layer 7, if the thickness of the resin layer 7 is 100 μm or more, the effect of improving insulation and heat resistance can be sufficiently obtained. Therefore, the thickness of the resin layer 7 is preferably 100 μm or more, more preferably 120 μm or more, and even more preferably 150 μm or more. Furthermore, if the thickness of the resin layer 7 is 600 μm or less, it does not affect the size of the composite material 1 and can suppress an increase in manufacturing costs. Therefore, the thickness of the resin layer 7 is preferably 600 μm or less, more preferably 550 μm or less, and even more preferably 500 μm or less.

[0093] <Substrate> In this embodiment, the substrate 2 is not particularly limited, and the main body of various products to which the composite material 1 according to this embodiment is applied can be used as the substrate 2. For example, when a bus bar, which will be described later, is applied as the composite material 1, a conductive bus bar body can be used as the substrate 2. Note that the bus bar body is conductive, and the substrate itself is electrically conductive; however, in this embodiment, the substrate 2 to be coated with the insulating coating 3 is not limited to a conductive material. For example, a substrate made of a non-electrically conductive material can also be used.

[0094] [Composite Member] Next, an example of a composite member obtained by the composite member manufacturing method according to the present invention will be described below. Figure 4 is a photograph showing an example of a composite member manufactured in accordance with the composite member manufacturing method according to the third embodiment. The composite member 1 shown in Figure 4 is an example in which the above-mentioned deposition process through the second coating material curing process are repeated one more time, and the conditions in the second coating material immersion process are adjusted so that a layer made of the second coating material is not formed between the layers made of the first coating material. Furthermore, the resin layer shown in the third embodiment is not formed in Figure 4.

[0095] 4 , a first layer 11, a second layer 12, and a third layer 13 made of a material (first coating material) containing the material of matrix 10 and inorganic material 20 are formed on the surface of substrate 2, and a fourth layer (surface layer) 24 made of the material of matrix 10 (second coating material) is formed on the surface of third layer 13. However, in the composite member 1 shown in FIG. 4 , no layer made of the second coating material is formed between each of the first layer 11, the second layer 12, and the third layer 13. Therefore, there are no boundaries between the first layer 11 and the second layer 12, and between the second layer 12 and the third layer 13, and the insulating coating appears to be a single thick coating containing the material of matrix 10 and inorganic material 20. Furthermore, pores 30 are formed inside insulating coating 3, but there is little difference in porosity between the region of insulating coating 3 near the fourth layer 24 and the region of insulating coating 3 near substrate 2, and there is little variation in the amount of pores 30 formed depending on the depth position of the insulating coating 3. Thus, according to the above manufacturing method, it is possible to easily form the insulating coating 3 having a desired thickness, high strength, and excellent insulating properties and heat resistance.

[0096] Figure 5 is a photograph showing another example of a composite member manufactured according to the manufacturing method of the third embodiment. The composite member 1 shown in Figure 5 is an example in which the above-described processes from the deposition step to the second coating material curing step were repeated one more time. The conditions for the second coating material immersion step were adjusted so that a layer of the second coating material was formed between each layer of the first coating material. Furthermore, the resin layer shown in the third embodiment is not formed in Figure 5.

[0097] 5 , a first layer 11, a third layer 13, and a fifth layer 15 made of a first coating material and a second layer 22, a fourth layer 24, and a sixth layer 26 made of a second coating material are alternately formed on the surface of a substrate 2 to form an insulating coating 3 having a desired thickness. In this way, when the second layer 22 and the fourth layer 24 having a dense structure made of the second coating material are formed between the layers made of the first coating material, excellent insulating properties can be obtained.

[0098] The fourth layer 24 in FIG. 4 and the sixth layer 26 in FIG. 5 , which exist on the surface of the insulating coating 3, correspond to the third layer 23 in FIGS. 1D and 2E and the fourth layer 24 in FIG. 3F, and function as surface layers. These surface layers do not contain the inorganic material 20 and are made of the material of the matrix 10. Therefore, these surface layers provide high adhesion to the underlying layers. Furthermore, the fourth layer 24 in FIG. 4 and the sixth layer 26 in FIG. 5 , which are formed as surface layers, are hard and dense layers. Therefore, the presence of the surface layer on at least a portion of the surface of the insulating coating 3 can suppress damage to the surface of the composite material 1 and cushion the impact of a colliding object. Furthermore, the presence of the surface layer on the surface of the insulating coating 3 can also prevent the inorganic material 20 and other materials from falling off.

[0099] (Thickness of Surface Layer) If the thickness of the surface layer present on the surface of the insulating coating 3 is 10 μm or more, it is possible to obtain the effect of protecting the composite material 1 and the effect of preventing the inorganic material 20 and the like from falling off. Therefore, the thickness of the surface layer is preferably 10 μm or more. Furthermore, if the thickness of the surface layer is 100 μm or less, it is possible to suppress the occurrence of peeling. Therefore, the thickness of the surface layer is preferably 100 μm or less. Note that in FIG. 5, there are a second layer 22 and a fourth layer 24 made of the same material as the surface layer, and the preferred thickness of these layers is the same as that of the surface layer.

[0100] [Specific Application Examples of the Composite Material] There are no particular limitations on the products to which the composite material 1 can be applied, but it can be applied, for example, to bus bars used to connect multiple battery cells or battery modules in an energy storage device. The bus bars will be described below.

[0101] FIG. 6 is a perspective view showing a busbar manufactured by a composite member manufacturing method according to an embodiment of the present invention. Note that FIG. 6 shows the busbar (composite member) 100 in a state immediately before being attached to a battery cell 130. The busbar body (base material) 110 is, for example, a Z-shaped metal plate member. The busbar body is secured in place by inserting an electrode 135 of the battery cell 130 into a connection hole 115a at one end and covering it with a terminal cap 136. An adjacent battery cell (not shown) or an external device (not shown) is connected to a connection hole 115b at the other end of the busbar body 110. The busbar body 110 is covered with an insulating coating 3 throughout its entirety, excluding the connection holes 115a and 115b. The busbar 100 is constructed in this manner.

[0102] Although not shown in the figures, the busbar body 110 may be I-shaped overall or may have an irregular shape with curved portions, and may have various shapes depending on the installation location of the battery cell 130.

[0103] If the busbar body 110 has a shape with a bent portion 110a or a curved portion (not shown), such as the Z-shape shown in the figure, the following problems may occur. For example, in a method in which ceramic tape is wrapped around the body, as in the busbar disclosed in Patent Document 1, the wrapping process is time-consuming to prevent unevenness or gaps in the winding at the bent portion 110a or the curved portion. In addition, it is possible that gaps may occur in the ceramic tape due to vibration or the adhesive between the ceramic tape and the body may peel off.

[0104] In contrast, when the busbar 100 is manufactured using the composite member manufacturing method according to the present invention as described above, it is possible to form a high-strength insulating coating 3 that is insulating and heat-resistant on the surface of the busbar body 110, without wrapping tape around the busbar body 110. Furthermore, because there is no need to wrap tape around the busbar body 110, there are no problems such as uneven winding, gaps, or peeling, and complex shapes can be easily accommodated.

[0105] The first coating material can be applied to the surface of the busbar body 110 by "dip coating," in which the busbar body 110 is immersed in a coating liquid, or by painting with a brush or spray. When dip coating is used, the insulating coating 3 is not formed on the connection holes 115a and 115b, so these areas are masked before being immersed in the coating liquid. Similarly, in other coating and immersion steps, it is preferable to mask the areas where the insulating coating 3 is not to be formed before applying the predetermined coating material. By repeating these steps multiple times, the insulating coating 3 can be formed to cover at least a portion of the surface of the busbar body 110.

[0106] In addition to the bus bar, the composite member according to this embodiment can be applied to connectors, protective parts for battery modules, cases for electronic components, battery cells, battery modules, battery packs, or motor coils.

[0107] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above-described embodiments may be combined in any manner without departing from the spirit of the invention.

[0108] This application is based on a Japanese patent application (Patent Application No. 2023-170684) filed on September 29, 2023, the contents of which are incorporated herein by reference.

[0109] REFERENCE SIGNS LIST 1 composite member 2 substrate 3 insulating coating 7 resin layer 10 matrix 11 first layer 12, 22 second layer 13, 23 third layer 15 fifth layer 20 inorganic material 24 fourth layer 26 sixth layer 30 pores 100 busbar 110 busbar body 110a bent portion 130 battery cell 135 electrode

Claims

1. A method for producing a composite member having a substrate and an insulating coating covering at least a portion of the surface of the substrate, the method comprising: a coating step of coating at least a portion of the surface of the substrate with a first coating material comprising a matrix material containing a compound having a siloxane bond and an inorganic material; and a first coating material hardening step of hardening the first coating material, characterized in that at least the coating step is repeated a plurality of times.

2. A method for producing a composite member according to claim 1, characterized in that the deposition step and the first coating material hardening step are repeated in this order a number of times.

3. A method for manufacturing a composite member as described in claim 2, characterized in that, among the deposition process and the first coating material hardening process which are repeated multiple times, in at least the final deposition process, the substrate is deposited by immersing in the first coating material.

4. A method for manufacturing a composite member as described in claim 2, characterized in that it comprises, after the first coating material hardening step, a second coating material immersion step of immersing the substrate on which the coating of the first coating material has been formed in a second coating material made of a matrix material containing a compound having a siloxane bond, and a second coating material hardening step of hardening the second coating material.

5. A method for manufacturing a composite member as described in claim 4, characterized in that a second coating material drying step for drying the second coating material is provided between the second coating material immersion step and the second coating material hardening step.

6. A method for manufacturing a composite member as described in claim 1, characterized in that after the deposition step, a first coating material drying step is included in which the first coating material is dried, and before the first coating material hardening step, the deposition step and the first coating material drying step are repeated in this order multiple times.

7. A method for manufacturing a composite member as described in claim 2, characterized in that a first coating material drying step for drying the first coating material is provided between the deposition step and the first coating material hardening step, and the deposition step, the first coating material drying step, and the first coating material hardening step are repeated multiple times in this order.

8. A method for manufacturing a composite member as described in claim 7, characterized in that the thickness of the layer formed by carrying out each of the deposition process, the first coating material drying process, and the first coating material hardening process once is 50 μm or more and 400 μm or less.

9. A method for manufacturing a composite member as described in claim 2, comprising, after the first coating material hardening step, an immersion step of immersing the substrate on which the coating of the first coating material has been formed in a second coating material made of a matrix material containing a compound having a siloxane bond, and a second coating material hardening step of hardening the second coating material, characterized in that the deposition step, the first coating material hardening step, the immersion step, and the second coating material hardening step are repeated multiple times in this order.

10. A method for manufacturing a composite member as described in claim 9, characterized in that it includes a first coating material drying step for drying the first coating material between the deposition step and the first coating material hardening step, and a second coating material drying step for drying the second coating material between the immersion step and the second coating material hardening step.

11. A method for manufacturing a composite member as described in claim 10, characterized in that the thickness of the layer formed by carrying out each of the steps from the deposition step to the second coating material hardening step once is 50 μm or more and 400 μm or less.

12. A method for producing a composite member according to any one of claims 1 to 11, characterized in that the insulating coating is formed so that its thickness is 150 μm or more and 800 μm or less.

13. A method for manufacturing a composite member according to any one of claims 1 to 11, characterized in that it includes a resin layer formation step of coating at least a portion of the surface with a resin material containing a resin different from the matrix material, and then hardening the resin material to form a resin layer.

14. A method for producing a composite member as described in any one of claims 1 to 11, characterized in that, prior to the deposition step, a blasting treatment step is performed on the base material so that the surface roughness Ra is 1 μm or more.

15. A method for manufacturing a composite member described in any one of claims 1 to 3 and 6 to 8, characterized in that the compound having a siloxane bond contained in the first coating material is at least one of silicone and silica sol.

16. A method for manufacturing a composite member described in any one of claims 4, 5, and 9 to 11, characterized in that the compound having a siloxane bond contained in each of the first coating material and the second coating material is at least one of silicone and silica sol.

17. The method for producing a composite member according to any one of claims 1 to 11, characterized in that the inorganic material contains at least one material selected from the group consisting of silica, alumina, mullite, and zirconia.

18. A method for producing a composite member according to any one of claims 1 to 11, characterized in that the inorganic material includes at least one selected from the group consisting of glass-based materials, mica, kaolin, talc, clay, pyrophyllite, montmorillonite, bentonite, wollastonite, xonotlite, zeolite, diatomaceous earth and halloysite.

19. A method for producing a composite member according to any one of claims 1 to 11, characterized in that the inorganic material contains at least one type selected from the group consisting of flake-shaped, fibrous and particulate inorganic materials.

20. A method for producing a composite member according to any one of claims 1 to 11, characterized in that the inorganic material contains at least one of a flake-like glass material and mica.

21. The method for manufacturing a composite member according to any one of claims 1 to 11, characterized in that the composite member is applied to a bus bar that connects a plurality of battery cells or battery modules.

22. The method for manufacturing a composite member according to any one of claims 1 to 11, characterized in that the composite member is applied to a connector, a protective part for a battery module, a case for an electronic component, a battery cell, a battery module, a battery pack, or a coil for a motor.

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