Battery housing panel

Abstract

The present invention relates to a battery housing panel. The present invention may provide a battery housing panel comprising: a first flame-retardant sheet layer; a composite layer formed on the first flame-retardant sheet layer; and a second flame-retardant sheet layer formed on the composite layer, wherein the composite layer is a fabric impregnated with resin.

Description

Technology Field

[0001] The present invention relates to a battery housing panel according to embodiments of the invention. Background Technology

[0002] Batteries and / or battery packs can pose various risks, such as electrical fires, due to external impact. Therefore, it may be required to ensure flame retardancy as a housing to protect batteries and / or battery packs. In particular, with the development and widespread adoption of electric vehicles, it is necessary to protect batteries and / or battery packs from external heat or impact to guarantee their safety.

[0003] To solve the aforementioned problems, the present invention aims to provide a battery pack housing plastic panel with improved heat resistance and impact resistance. The problem to be solved

[0004] The present invention provides a battery housing panel with improved heat resistance and impact resistance by introducing a composite layer.

[0005] However, the problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0006] According to one embodiment, a battery housing panel comprises: a first flame-retardant sheet layer; a composite layer formed on the first flame-retardant sheet layer; and a second flame-retardant sheet layer formed on the composite layer; wherein the composite layer may be a fabric impregnated with resin.

[0007] According to one embodiment, the first flame-retardant sheet layer may comprise 30% to 70% by weight of polypropylene; 5% to 10% by weight of glass fiber, 10% to 20% by weight of phosphorus-nitrogen-based flame retardant, 10% to 20% by weight of expanded graphite, 0.1% to 10% by weight of antioxidant, and 0.1% to 10% by weight of lubricant.

[0008] According to one embodiment, the second flame-retardant sheet layer may comprise 30% to 70% by weight of polypropylene, 5% to 10% by weight of glass fiber, 10% to 20% by weight of phosphorus-nitrogen-based flame retardant, 10% to 20% by weight of expanded graphite, 0.1% to 10% by weight of antioxidant, and 0.1% to 10% by weight of lubricant.

[0009] According to one embodiment, the composite layer may comprise a fabric comprising one or more types selected from the group consisting of polypropylene, glass fiber-based fabrics, and phosphorus-nitrogen-based flame retardants.

[0010] According to one embodiment, the fabric comprises glass fibers, and the glass fibers may comprise 300 to 2400 tex counts.

[0011] According to one embodiment, the fabric is formed by arranging in the warp direction and the weft direction, and the fabric density in the warp direction and the fabric density in the weft direction may each be 10 to 20 pieces / inch.

[0012] According to one embodiment, the fabric may be manufactured in a plain weave or a twill weave.

[0013] According to one embodiment, the resin is a thermoplastic resin, and the thermoplastic resin may include one or more types selected from the group consisting of polypropylene, polyamide, and polyethylene.

[0014] According to one embodiment, the weight ratio of fabric to resin in the composite layer may be 50 to 70: 50 to 30.

[0015] According to one embodiment, it may further include a flame-retardant coating layer formed on the first flame-retardant sheet layer.

[0016] According to one embodiment, the flame-retardant coating layer may comprise one or more phosphorus / nitrogen compounds selected from the group consisting of melamine phosphate, polyphosphate ammonium, pyrophosphate ammonium, aluminum phosphinate, and aluminum diethyl phosphinate; a blowing agent comprising melamine; and a carbon source comprising one or more selected from the group consisting of monopentaerythritol, dipentaerythritol, tripentaerythritol, and starch.

[0017] According to one embodiment, the phosphorus / nitrogen-based compound may be in an amount of 1 to 70 parts by weight based on 100 parts by weight of the flame-retardant coating layer, the foaming agent may be in an amount of 10 to 20 parts by weight based on 100 parts by weight of the flame-retardant coating layer, and the carbonizing agent may be in an amount of 5 to 20 parts by weight based on 100 parts by weight of the flame-retardant coating layer.

[0018] According to one embodiment, the flame-retardant coating layer further comprises one or more flame-retardant resins selected from the group consisting of acrylic resin, epoxy resin, styrene resin, and phenolic resin; and the flame-retardant resin may be in an amount of 1 to 80 parts by weight based on 100 parts by weight of the flame-retardant coating layer.

[0019] According to one embodiment, the flame-retardant coating layer may have a shape deformation rate of less than 10% for a period of 10 minutes or less at a temperature of 500°C or higher.

[0020] According to one embodiment, the thickness of the battery housing panel may be 1.0 mm to 2.4 mm.

[0021] According to one embodiment, the flame resistance performance of the flame-retardant sheet layer may be such that perforation occurs after 30 minutes under conditions of a flame temperature of 1100 ℃ to 1300 ℃.

[0022] According to one embodiment, the specific gravity of the battery housing panel may be 1.2 to 1.5. Effects of the invention

[0023] The present invention can provide a battery housing panel with improved heat resistance and impact resistance. Specific details for implementing the invention

[0024] Embodiments of the present invention will be described in detail below with reference to the examples. In describing the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the present invention. Furthermore, the terms used in this specification are used to appropriately express preferred embodiments of the present invention, and these may vary depending on the intentions of the user or operator, or the conventions of the field to which the present invention belongs. Accordingly, the definitions of these terms should be based on the content throughout this specification.

[0025] Throughout the specification, when it is stated that a component is located "on" another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components.

[0026] Throughout the specification, when a part is described as "including" a certain component, this means that it does not exclude other components but may include additional components.

[0027] In this document, phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “at least one of A, B, or C” may each include any one of the items listed together with the corresponding phrase, or all possible combinations thereof. Terms such as “first,” “second,” or “first” or “second” may be used simply to distinguish a component from another component and do not limit the components in any other aspect (e.g., importance or order). For example, appropriate results may be achieved even if the described techniques are performed in a different order than described, and / or the described components are combined or combined in a form different from described, or are substituted or replaced by other components or equivalents. Therefore, other implementations, other embodiments, and equivalents to the claims set forth below are also within the scope of the claims.

[0028] Hereinafter, the battery housing panel of the present invention will be described in detail with reference to embodiments. However, the present invention is not limited to these embodiments.

[0029] According to one embodiment, the battery housing panel of the present invention may include: a first flame-retardant sheet layer; a composite layer formed on the first flame-retardant sheet layer; and a second flame-retardant sheet layer formed on the composite layer.

[0030] According to one embodiment, the first flame-retardant sheet layer and the second flame-retardant sheet layer may have the same or different compositions. The composition may correspond to components, content, or thickness.

[0031] According to one embodiment, the first flame-retardant sheet layer may comprise 30% to 70% by weight of polypropylene, 5% to 10% by weight of glass fiber, 10% to 20% by weight of phosphorus-nitrogen-based flame retardant, 10% to 20% by weight of expanded graphite, 0.1% to 10% by weight of antioxidant, and 0.1% to 10% by weight of lubricant.

[0032] According to one embodiment, the second flame-retardant sheet layer may comprise 30% to 70% by weight of polypropylene, 5% to 10% by weight of glass fiber, 10% to 20% by weight of phosphorus-nitrogen-based flame retardant, 10% to 20% by weight of expanded graphite, 0.1% to 10% by weight of antioxidant, and 0.1% to 10% by weight of lubricant. According to one embodiment, the first flame-retardant sheet layer and the second flame-retardant sheet layer may improve heat resistance, flame retardancy, and impact resistance by applying the aforementioned content ranges.

[0033] According to one embodiment, the heat distortion temperature (HDT) (based on 455 kPa) of the polypropylene resin in the first flame-retardant sheet layer and the second flame-retardant sheet layer may be 60 ℃ to 210 ℃. For example, at 455 kPa, the heat distortion temperature of the polypropylene resin may be 60 ℃ to 210 ℃; 70 ℃ to 200 ℃; 80 ℃ to 200 ℃; 100 ℃ to 200 ℃; 120 ℃ to 200 ℃; or 170 ℃ to 200 ℃.

[0034] According to one embodiment, according to one embodiment, the glass fibers in the first flame-retardant sheet layer and the second flame-retardant sheet layer may have a fiber length of 50 μm to 400 μm and a diameter (or thickness) of 10 μm to 50 μm.

[0035] According to one embodiment, according to one embodiment, the phosphorus-nitrogen-based flame retardant in the first flame retardant sheet layer and the second flame retardant sheet layer may comprise polyphosphate ammonium or pyrophosphate ammonium.

[0036] According to one embodiment, the expandable graphite in the first flame-retardant sheet layer and the second flame-retardant sheet layer may be a material with excellent fire resistance that expands at a high magnification by flames during a fire to provide a thermal insulation effect, thereby protecting combustible materials. For example, the expandable graphite may have an expansion rate of 20 ml / g to 500 ml / g and a size (particle diameter) of 20 mesh to 300 mesh.

[0037] According to one embodiment, the antioxidant in the first flame-retardant sheet layer and the second flame-retardant sheet layer may be selected from bisphenol-based, polymeric phenol-based, aromatic-based, and phosphorus-based antioxidants, but is not limited thereto.

[0038] According to one embodiment, the lubricant in the first flame-retardant sheet layer and the second flame-retardant sheet layer may be paraffin, polyethylene wax, stearic acid, alkaline earth metal stearate (e.g., zinc stearate, calcium stearate, etc.), vinylidene fluoride-hexafluoropropylene polymer, polyester polyol, erucamide, oleic amide, etc., but is not limited thereto.

[0039] According to one embodiment, the composite layer is a fabric impregnated with resin, and the fabric may be a fabric comprising one or more types selected from the group consisting of polypropylene, glass fiber-based fabrics, and phosphorus-nitrogen-based flame retardants. The fabric may have a tex count of 300 to 2400. Preferably, the fabric may include glass fibers, and the glass fibers may have a tex count of 600 to 1200.

[0040] According to one embodiment, the fabric may be a fabric formed by arranging in the warp direction and the weft direction, for example, the fabric density in the warp direction and the fabric density in the weft direction may each be 10 to 2000 fibers / inch. According to one embodiment, the fabric may be manufactured as a plain weave or a twill weave.

[0041] According to one embodiment, the resin is a thermoplastic resin, and the thermoplastic resin may comprise one or more selected from the group consisting of polypropylene, polyamide 6, polyamide 66, polyetheretherketone, polycarbonate, polyphenylenesulfone, polyphenylene ether, and polyurethane. Preferably, it may comprise polypropylene, polyamide, or polyethylene resin.

[0042] According to one embodiment, the thermoplastic resin may have a heat distortion temperature (HDT) (based on 455 kPa) of 60 ℃ to 210 ℃. According to one embodiment, the thermoplastic resin may have a heat distortion temperature at 455 kPa of 60 ℃ to 210 ℃; 70 ℃ to 200 ℃; 80 ℃ to 200 ℃; 100 ℃ to 200 ℃; 120 ℃ to 200 ℃; or 170 ℃ to 200 ℃.

[0043] According to one embodiment, the weight ratio of the fabric to the resin in the composite layer may be 50 to 70: 50 to 30. By applying the mentioned weight ratio, heat resistance and impact resistance can be improved.

[0044] According to one embodiment, a flame-retardant coating layer formed on the first flame-retardant sheet layer may be further included. The flame-retardant coating layer comprises a phosphorus-nitrogen compound, a foaming agent, and a carbonizing agent, and may further include a flame-retardant resin.

[0045] According to one embodiment, the phosphorus-nitrogen compound may comprise one or more selected from the group consisting of melamine phosphate, polyphosphate ammonium, pyrophosphate ammonium, aluminum phosphinate and aluminum diethyl phosphinate.

[0046] According to one embodiment, the phosphorus-containing compound may be in an amount of 1 to 70 parts by weight based on 100 parts by weight of the flame-retardant coating layer. Flame retardancy can be improved by applying the mentioned content.

[0047] According to one embodiment, the blowing agent may include melamine. The blowing agent may be included in an amount of 10 to 20 parts by weight based on 100 parts by weight of the flame-retardant coating layer. If the content of the blowing agent is less than 10 parts by weight, the amount of gas generated is small, which is insufficient to foam the carbonized layer and is therefore undesirable. If the amount used exceeds 20 parts by weight, the amount of gas generated increases, and due to the excessive release of gas before foaming the carbonized layer, it becomes difficult to form a uniform carbonized layer, and thus flame-retardant performance cannot be expected.

[0048] According to one embodiment, the carbonizing agent may include one or more selected from the group consisting of monopentaerythritol, dipentaerythritol, tripentaerythritol, and starch.

[0049] According to one embodiment, the carbonizing agent may be in an amount of 5 to 20 parts by weight based on 100 parts by weight of the flame-retardant coating layer. If the content of the carbonizing agent is less than 5 parts by weight, the chemical reaction with the foaming agent is weak, resulting in insufficient formation of the carbonized layer, and if it exceeds 20 parts by weight, the foaming effect is significantly reduced, making it impossible to expect flame-retardant performance.

[0050] According to one embodiment, the flame-retardant coating layer further comprises a flame-retardant resin, and the flame-retardant resin may include, but is not limited to, an acrylic resin, an epoxy resin, a styrene resin, a phenolic resin, an aromatic vinyl polymer resin, a polyphenylene ether resin, a polyphenylene sulfide resin, a polyalkyl (meth)acrylate resin, a polycarbonate resin, a polyolefin resin, a polyester resin, a polyamide resin, etc.

[0051] According to one embodiment, the epoxy resin may be selected from bisphenol A epoxy resin, bisphenol F epoxy resin, brominated epoxy resin, novolak epoxy resin, acrylic modified epoxy resin, and phenoxy epoxy resin.

[0052] According to one embodiment, the acrylic resin may be polymerized in the presence of at least one suitable initiator selected from butyl acrylate, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxymethyl methacrylate, dimethylaminoethyl methacrylate, glycidyl methacrylate, acrylic acid, and methacrylic acid.

[0053] According to one embodiment, the flame-retardant resin may be in an amount of 1 to 80 parts by weight based on 100 parts by weight of the flame-retardant coating layer. If the amount is less than 1 part by weight, shrinkage and cracking phenomena occur during foaming, and if the amount exceeds 80 parts by weight, the foaming rate decreases, so normal flame-retardant performance cannot be achieved.

[0054] According to one embodiment, the flame-retardant coating layer may have a shape deformation rate of less than 10% for a period of 10 minutes or less at a temperature of 500°C or higher.

[0055] According to one embodiment, the first flame-retardant sheet layer and the second flame-retardant sheet layer can each provide flame-retardant performance in which perforation occurs after 30 minutes under conditions of a flame temperature of 1100 ℃ to 1300 ℃.

[0056] According to one embodiment, the thickness of the battery housing panel may be 1.0 mm to 2.4 mm; 1.2 mm to 2.4 mm; 1.5 mm to 2.4 mm; or 1.8 mm to 2.0 mm.

[0057] According to one embodiment, the specific gravity of the battery housing panel may be 1.2 to 1.5; 1.3 to 1.5 or 1.4 to 1.5.

[0058] Examples

[0059] Example 1: Manufacture of a battery housing panel

[0060] A composite sheet was produced by impregnating a glass fiber fabric (600 tex count) with polyethylene resin and drying it at room temperature. In the composite sheet, the mass ratio of fabric to resin is 50:60, and the thickness of the composite sheet is 1.0 T.

[0061] Two flame-retardant sheets having a thickness of 0.4 T were produced by mixing polypropylene resin (50 wt%), glass fiber (10 wt%), phosphorus-nitrogen-based flame retardant (20 wt%), expanded graphite (15 wt%), antioxidant (2 wt%), and lubricant (3 wt%), and then extruding the mixture into a sheet shape. A release film is attached to one side of the flame-retardant sheets.

[0062] A composite sheet was placed on a first flame-retardant sheet, a second flame-retardant sheet was placed on the composite sheet, and a battery housing panel was manufactured by compressing.

[0063] Examples 2 to 5

[0064] The process was carried out in the same manner as Example 1, except that the composite sheet and flame-retardant sheet were manufactured according to Table 1 below.

[0065]

[0066] * Glass fiber: Average length (approx. 400 µm) and average diameter (approx. 40 µm)

[0067] Polypropylene resin: Heat distortion temperature approx. 170 ℃ to approx. 200 ℃

[0068] Phosphorus-nitrogen based flame retardant: Ammonium polyphosphate

[0069] Expanded Graphite: Average expansion rate 300 ml / g, 150 mesh

[0070] Lubricant: Calcium stearate and paraffin (1:1 (w / w))

[0071] Example 6: Manufacture of a battery housing panel with a flame-retardant coating layer

[0072] The procedure was carried out in the same manner as Example 1, except that the flame-retardant coating layer below was formed. A flame-retardant coating layer comprising polyphosphate ammonium (20 wt%), melamine (15 wt%), monopentaerythritol (20 wt%), and the remainder being an epoxy-based flame-retardant resin (45 wt%) was formed on a flame-retardant sheet (first flame-retardant sheet). The thickness of the flame-retardant coating layer is 0.3 T. A composite sheet was placed on the first flame-retardant sheet (the side opposite to the side where the flame-retardant coating layer was formed), a second flame-retardant sheet was placed on the composite sheet, and a battery housing panel was produced by compressing.

[0073] The physical properties of the panels produced in Examples 1 and 6 were measured by the following method. The measurement results confirmed that the heat resistance and impact resistance were excellent.

[0074] (1) Specific gravity

[0075] It was measured according to ASTM D 792 (Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics).

[0076] (2) Heat distortion temperature

[0077] The heat distortion temperature was measured according to ISO 75.

[0078] (3) Surface impact energy

[0079] The surface impact energy was measured according to ISO 6603.

[0080] (4) Flame retardancy rating and flame resistance evaluation

[0081] The flame retardancy rating was determined using the "MS300-08" standard measurement method, and the flame resistance evaluation was performed by measuring the time to perforation at a flame temperature of 1100 ℃ to 1300 ℃.

[0082] Although the embodiments have been described above by a limited number of examples, those skilled in the art can make various modifications and variations from the description above. For example, suitable results may be achieved even if the described techniques are performed in a different order than described, and / or the described components are combined or combined in a form different from described, or replaced or substituted by other components or equivalents. Therefore, other implementations, other embodiments, and equivalents to the claims below are also within the scope of the claims.

Claims

Claim 1 A first flame-retardant sheet layer; a composite layer formed on the first flame-retardant sheet layer; and a second flame-retardant sheet layer formed on the composite layer; wherein the composite layer is a fabric impregnated with resin, and the first flame-retardant sheet layer comprises 30 wt% to 70 wt% polypropylene, 5 wt% to 10 wt% glass fiber, 10 wt% to 20 wt% phosphorus-nitrogen-based flame retardant, 10 wt% to 20 wt% expanded graphite, 0.1 wt% to 10 wt% antioxidant, and 0.1 wt% to 10 wt% lubricant; and the second flame-retardant sheet layer comprises 30 wt% to 70 wt% polypropylene, 5 wt% to 10 wt% glass fiber, 10 wt% to 20 wt% phosphorus-nitrogen-based flame retardant, 10 wt% to 20 wt% expanded graphite, 0.1 wt% to 10 wt% antioxidant, and 0.1 wt% to 10 wt% lubricant, and the first A battery housing panel having a flame-retardant sheet layer and, in the second flame-retardant sheet layer, the glass fibers have a fiber length of 50 μm to 400 μm and a diameter of 10 μm to 50 μm, and the thickness of the battery housing panel is 1.0 mm to 2.4 mm. Claim 2 delete Claim 3 delete Claim 4 A battery housing panel according to claim 1, wherein the composite layer comprises a fabric including one or more types selected from the group consisting of polypropylene, glass fiber-based fabrics, and phosphorus-nitrogen-based flame retardants. Claim 5 A battery housing panel according to claim 1, wherein the fabric comprises glass fibers, and the glass fibers of the fabric comprise 300 to 2400 tex counts. Claim 6 A battery housing panel according to claim 5, wherein the fabric is formed by arranging in the warp direction and the weft direction, and the fabric density in the warp direction and the fabric density in the weft direction are each 10 pieces / inch to 2000 pieces / inch. Claim 7 A battery housing panel according to claim 1, wherein the fabric is manufactured in a plain weave or twill weave. Claim 8 A battery housing panel according to claim 1, wherein the resin is a thermoplastic resin, and the thermoplastic resin comprises one or more types selected from the group consisting of polypropylene, polyamide, and polyethylene. Claim 9 A battery housing panel according to claim 1, wherein the weight ratio of fabric to resin in the composite layer is 50 to 70: 50 to 30. Claim 10 A battery housing panel comprising, in addition to, a flame-retardant coating layer formed on the first flame-retardant sheet layer in claim 1. Claim 11 In claim 10, the flame-retardant coating layer comprises one or more phosphorus / nitrogen-based compounds selected from the group consisting of melamine phosphate, polyphosphate ammonium, pyrophosphate ammonium, aluminum phosphinate, and aluminum diethyl phosphinate; a foaming agent comprising melamine; A battery housing panel comprising one or more carbonizing agents selected from the group consisting of monopentaerythritol, dipentaerythritol, tripentaerythritol, and starch, wherein the phosphorus / nitrogen-based compound is 1 to 70 parts by weight based on 100 parts by weight of the flame-retardant coating layer, the foaming agent is 10 to 20 parts by weight based on 100 parts by weight of the flame-retardant coating layer, and the carbonizing agent is 5 to 20 parts by weight based on 100 parts by weight of the flame-retardant coating layer. Claim 12 A battery housing panel according to claim 10, wherein the flame-retardant coating layer further comprises one or more flame-retardant resins selected from the group consisting of acrylic resin, epoxy resin, styrene resin, and phenolic resin, and wherein the flame-retardant resin is in an amount of 1 to 80 parts by weight based on 100 parts by weight of the flame-retardant coating layer. Claim 13 A battery housing panel according to claim 10, wherein the flame-retardant coating layer has a shape deformation rate of less than 10% for a time of 10 minutes or less at a temperature of 500 ℃ or higher. Claim 14 delete Claim 15 A battery housing panel according to claim 1, wherein the flame resistance performance of the flame-retardant sheet layer is such that perforation occurs after 30 minutes under flame temperature conditions of 1100 ℃ to 1300 ℃. Claim 16 A battery housing panel according to claim 1, wherein the specific gravity of the battery housing panel is 1.2 to 1.5.

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