A method for preparing a composite material for a new energy vehicle battery case suitable for a wide temperature range and a new energy vehicle battery case

Abstract

The present invention discloses a method for preparing a composite material for a new energy vehicle battery case suitable for a wide temperature range and a new energy vehicle battery case. The preparation method includes the following steps: one, preparation of an outer layer SMC material; two, processing a polystyrene foam board; three, assembling polystyrene foam board strips, and finally assembling the inner and outer layers. The polystyrene foam board used in the inner layer of the invention is a Class A fireproof material, which has the characteristics of high pressure resistance, light weight, non-water absorption, airtightness, wear resistance, and non-degradation, further giving the material characteristics of light weight and flame retardancy. The present invention can better maintain the temperature inside the battery, and when the ambient temperature is high in summer, it can also prevent heat accumulation from causing danger. The present invention has good mechanical strength, corrosion resistance, heat dissipation, flame retardancy and performance, and can realize the possibility of efficient use of electric vehicles in northern regions in winter.

Description

Technical Field

[0001] The present invention relates to a method for preparing a composite material for a new energy vehicle battery case and a new energy vehicle battery case, and in particular to a method for preparing a composite material for a new energy vehicle battery case suitable for a wide temperature range and a new energy vehicle battery case. Background Art

[0002] Energy and environmental issues are becoming increasingly serious. Developing energy-saving and new energy vehicles is an effective way to address these issues and a powerful measure to achieve national ecological progress. Pure electric vehicles are pollution-free during operation, emitting no harmful gases that pollute the atmosphere.

[0003] As the power source for new energy vehicles, the power battery is the most important system in the entire vehicle. It is also the iconic component that distinguishes new energy vehicles from traditional fuel vehicles. The power battery is the heart of new energy vehicles. The characteristics of the power battery are significantly affected by the ambient temperature. Short-term use of lithium batteries in low-temperature environments, or when the temperature is not low enough, will only temporarily affect the battery capacity but will not cause permanent damage. However, if used in low-temperature environments for a long time, lithium-ion batteries may be "frozen" and cause permanent damage, shortening their service life. In high-temperature environments, if the temperature rises, the battery output power will increase, which will also affect the transfer speed of the electrolyte. As the temperature rises, the transfer speed increases, while as the temperature drops, the transfer speed slows down. The battery's charge and discharge performance will also be affected, and the chemical balance within the battery may be disrupted, leading to side reactions.

[0004] As a direct protective device for the battery, the battery case's design must fully consider its operating temperature range, weight, strength, safety, and service life. This article examines the material selection and structural design of new energy vehicle battery cases, analyzing their research priorities and development directions.

[0005] Patent publication number CN 115160688 A discloses a flame-retardant polypropylene composite material for new energy vehicle battery pack covers and its preparation method. The composite material utilizes high-melt-strength polypropylene as the primary matrix, polyethylene as a melt-strength modifier, and is prepared by adding 20-30 wt% of a flame retardant. While this patented material exhibits flame retardancy, its functional properties are limited, its operating temperature range is narrow, and it struggles to meet the increasingly diverse performance requirements of new energy vehicle battery housings. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for preparing a composite material for a new energy vehicle battery case suitable for a wide temperature range and a new energy vehicle battery case, so as to solve the shortcomings of the existing technology such as single functional performance, narrow operating temperature range, and difficulty in meeting the increasingly diverse performance requirements of new energy vehicle battery cases.

[0007] The present invention provides the following solutions:

[0008] A method for preparing a composite material for a new energy vehicle battery box suitable for a wide temperature range, specifically comprising:

[0009] Step 1: Preparation of outer layer SMC material: Use a high-speed turbine mixer to evenly mix unsaturated resin powder, filler, hardener, surfactant, and flame retardant into a paste, then add a tackifier to the above mixture to make a resin paste, evenly apply the resin paste on a polyethylene film, sandwich carbon fiber between two polyethylene films coated with resin paste, and then impregnate the resin composite into the carbon fiber felt through a compacting roller. The obtained material is stacked in three layers and compression molded to finally obtain the outer layer SMC material;

[0010] Step 2: Processing the polystyrene foam board: Select a polystyrene foam board, silver-plate one side of the polystyrene foam board by silver mirror reaction to form a silver-plated layer, and then cut it into long strips;

[0011] Step 3: Assembly: Assemble the polystyrene foam board strips as the inner layer structure of the new energy vehicle battery box with a wide temperature range, and finally assemble the inner layer and the outer layer.

[0012] Furthermore, in step 1, the unsaturated resin is one of bisphenol A type unsaturated polyester and halogenated unsaturated polyester, the resin content is 28-33wt%, the length of the carbon fiber is 4-6cm, and the content is 25-34wt%;

[0013] In step 1, the hardener is one or more of TBPO and BPO, with a content of 2-3 wt%;

[0014] In step 1, the filler is one or more of barium sulfate and talc, with a content of 28-33 wt%;

[0015] In step 1, the surfactant is one or more of sodium lauryl sulfate, lauryl dimethylamine oxide, and alkyl alcohol amide, and the content is 2-3 wt%;

[0016] In step 1, the thickener is one or more of magnesium oxide, calcium oxide, and calcium hydroxide, and the content is 2-3 wt%;

[0017] In step 1, the thickness of the outer layer SMC material is finally obtained to be 9-12 mm;

[0018] In step 1, the flame retardant is aluminum hydroxide, and the content is 2-3 wt%.

[0019] Furthermore, in step 2, the polystyrene foam board selected is a Class A fireproof material, the width of the polystyrene foam board strip is 1-2 cm, the thickness is 3-5 mm, and the thickness of the silver plating layer is 15 microns.

[0020] Furthermore, in step 3, the outer layer structure is the SMC material in step 1 or a lightweight aluminum alloy;

[0021] In step 3, the distance between the outer structure and the inner structure is half the width of the polystyrene foam board strip + 5mm;

[0022] In step 3, the silver-plated side of the polystyrene foam board strip is the side close to the outer layer material;

[0023] In step 3, the skeleton and gears that string together the polystyrene foam board strips in the inner structure are made of aluminum alloy skeletons;

[0024] In step three, the inner structure is switched on and off by means of switches.

[0025] A method for preparing a composite material for a new energy vehicle battery box suitable for a wide temperature range, comprising:

[0026] The unsaturated resin powder, filler, hardener, surfactant and flame retardant are uniformly mixed to form a mixture, and then the tackifier is added to the mixture to form a resin paste;

[0027] The resin paste is coated on a polyethylene film, and carbon fibers are sandwiched between two layers of polyethylene film;

[0028] The resin compound is impregnated into the carbon fiber felt and compression molded to produce the outer layer SMC material;

[0029] One side of the polystyrene foam sheet is silver-plated and cut to form the inner structure of the battery box.

[0030] Furthermore, the method further includes: after forming the inner layer structure of the battery case, assembling the inner layer and the outer layer of the battery case;

[0031] The unsaturated resin powder, filler, hardener, surfactant and flame retardant are uniformly mixed into a mixture by a high-speed turbine mixer.

[0032] A new energy vehicle battery case composite material suitable for a wide temperature range, wherein the new energy vehicle battery case composite material is prepared by the method described.

[0033] A composite material molded product for a new energy vehicle battery case suitable for a wide temperature range, comprising a new energy vehicle battery case composite material.

[0034] A new energy vehicle battery case suitable for a wide temperature range, comprising a new energy vehicle battery case composite material molded product.

[0035] Furthermore, the new energy vehicle battery box has a shutter structure.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] 1. The composite material, preparation method, and structure for a new energy vehicle battery case suitable for a wide temperature range of the present invention utilizes SMC or a lightweight aluminum alloy as the outer layer material, thereby facilitating lightweighting. The unsaturated resin used in the SMC material exhibits excellent chemical stability and corrosion resistance, while the added flame retardant achieves a high flame retardancy rating. The polystyrene foam board used in the inner layer is a Class A fireproof material with high compressive strength, lightweight, non-absorbent, airtight, wear-resistant, and non-degradable properties, further enhancing the material's lightweight and flame retardant characteristics.

[0038] 2. The composite material, preparation method, and structure for a new energy vehicle battery case suitable for a wide temperature range of the present invention utilize a combined inner and outer layer structure, with the inner layer structure being similar to an electric blind. This unique structural feature allows the new energy vehicle battery case to dissipate heat in the summer and retain heat in the winter. This facilitates the practicality of electric vehicles in northern winter. In northern regions, where winter temperatures are particularly low, polystyrene foam panels are lightweight and heat-insulating. Silver-plated outer layers, like the structure of a thermos kettle, effectively reflect heat radiation. When temperatures are low in winter, a closed structure effectively prevents internal heat dissipation from the battery, effectively maintaining the internal temperature. This also retains some of the heat generated by the battery during operation, significantly extending battery life and reducing the risk of rapid battery charge loss and shutdown caused by sudden temperature drops. At lower temperatures, the angle of the polystyrene foam strips can be adjusted, preventing them from being completely closed to reduce temperature loss. For summer temperatures, when ambient temperatures are higher, a different structural design can be employed to facilitate heat transfer and prevent dangerous heat accumulation.

[0039] 3. The composite material, preparation method and structure for new energy vehicle battery cases suitable for a wide temperature range of the present invention have good mechanical strength, corrosion resistance, heat dissipation, flame retardancy and performance, and can realize the possibility of efficient use of electric vehicles in northern regions in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a flow chart of a method for preparing composite materials for new energy vehicle battery cases suitable for a wide temperature range.

[0042] Figure 2 This is a structural diagram (heat dissipation structure) of a new energy vehicle battery box suitable for a wide temperature range.

[0043] Figure 3 This is a structural diagram (insulation structure) of a new energy vehicle battery box suitable for a wide temperature range.

[0044] Figure 4 This is a rendering of a new energy vehicle battery box (heat dissipation structure) suitable for a wide temperature range.

[0045] Figure 5 This is a rendering of a new energy vehicle battery box (insulation structure) suitable for a wide temperature range. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] The development of social science and technology places higher demands on materials, which in turn require them to possess excellent comprehensive performance. While meeting daily requirements, the battery casings of new energy vehicles also place higher demands on lightweighting, thermal stability, and other aspects. Therefore, the development of lightweight and stable materials remains a key focus of research and development.

[0048] Example 1:

[0049] Step 1: Preparation of the outer SMC material: Using a high-speed turbine mixer, uniformly mix 30wt% bisphenol A unsaturated polyester powder, 3wt% TBPO, 33wt% barium sulfate, 3wt% sodium lauryl sulfate, and 3wt% aluminum hydroxide to form a paste. 3wt% calcium hydroxide is then added to the mixture to form a resin paste. This resin paste is evenly applied to polyethylene film. Carbon fibers are sandwiched between two polyethylene films coated with resin paste. The resin composite is then impregnated into carbon fiber felt using a compacting roller. The resulting material is then stacked in three layers and compression molded to produce an SMC material with an outer layer thickness of 12mm.

[0050] Step 2: Processing the polystyrene foam board: Select a polystyrene foam board, silver-plate one side of the polystyrene foam board by silver mirror reaction to form a silver-plated layer, and then cut it into strips with a width of 1 cm and a thickness of 3 mm.

[0051] Step 3: Assemble the polystyrene foam board strips as the inner layer structure of the new energy vehicle battery box with a wide temperature range, and finally assemble the inner layer and the outer layer (the above-mentioned SMC material).

[0052] This embodiment can be combined with any embodiment in the specification of this application to form more embodiments, as long as there is no technical conflict or contradiction. The specific content of the new embodiment will not be repeated due to space limitations.

[0053] Example 2:

[0054] In this example, a high-speed turbine mixer is used to uniformly mix 30 wt% bisphenol A unsaturated polyester powder, 2 wt% TBPO, 28 wt% barium sulfate, 2 wt% sodium lauryl sulfate, and 2 wt% aluminum hydroxide to form a paste. 2 wt% calcium hydroxide is then added to the mixture to form a resin paste. The remainder of this example is identical to Example 1, and this example can be combined with any of the examples in this specification to form further examples, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific details of the resulting new examples will not be repeated here.

[0055] Example 3:

[0056] In this embodiment, a high-speed turbine mixer is used to uniformly mix 30 wt% of halogenated unsaturated polyester powder, 3 wt% of BPO, 33 wt% of talc, 3 wt% of sodium lauryl sulfate, and 3 wt% of aluminum hydroxide to form a paste. 3 wt% of calcium oxide is then added to the mixture to form a resin paste. The remainder of this embodiment is identical to that of Example 1, and this embodiment can be combined with any of the embodiments in this specification to form further embodiments, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific details of the resulting new embodiments will not be repeated here.

[0057] Example 4:

[0058] In this embodiment, a high-speed turbine mixer is used to uniformly mix 30 wt% of halogenated unsaturated polyester powder, 3 wt% of BPO, 33 wt% of talc, 3 wt% of sodium lauryl sulfate, and 3 wt% of aluminum hydroxide to form a paste. 3 wt% of magnesium oxide is then added to the mixture to form a resin paste. The remainder of this embodiment is identical to that of Example 1, and this embodiment can be combined with any of the embodiments in this specification to form further embodiments, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific details of the resulting new embodiments will not be repeated here.

[0059] Embodiment 5:

[0060] In Example 5, an SMC material with an outer layer thickness of 9 mm was finally obtained. The rest of this embodiment is the same as that of Example 1, and this embodiment can be combined with any embodiment in this specification to form further embodiments, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific contents of the formed new embodiments will not be repeated here.

[0061] Example 6:

[0062] The silver-plated polystyrene foam strip in step 2 of this embodiment is 2 cm wide and 5 mm thick. The remainder of this embodiment is identical to that of embodiment 1, and this embodiment can be combined with any embodiment in this specification to form further embodiments, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific details of the resulting new embodiments will not be detailed here.

[0063] Embodiment seven:

[0064] In step 3 of this embodiment, long strips of polystyrene foam board are assembled to form the inner layer structure of the wide-temperature range new energy vehicle battery box. Finally, the inner layer and the outer layer (aluminum alloy shell) are assembled. The rest of this embodiment is the same as that of embodiment 1, and this embodiment can be combined with any embodiment of this application specification to form more embodiments, as long as there are no technical conflicts or contradictions. The specific content of the new embodiment will not be repeated due to space limitations.

[0065] Performance table of the flame retardant and shock absorbing composite materials (outer layer structural SMC materials) for new energy vehicle battery boxes prepared in Examples 1-7:

[0066]

[0067] Example 8: Figure 1 As shown, this embodiment discloses a method for preparing a composite material for a new energy vehicle battery box suitable for a wide temperature range, and the method steps include:

[0068] Step 1 (Step S1), preparation of outer layer SMC material: using a high-speed turbine mixer to uniformly mix unsaturated resin powder, filler, hardener, surfactant, and flame retardant into a paste, then adding a tackifier to the above mixture to make a resin paste, the resin paste is evenly coated on a polyethylene film, carbon fiber is sandwiched between two polyethylene films coated with resin paste, and then the resin composite is impregnated into the carbon fiber felt by a pressing roller, and the obtained material is stacked in three layers and compression molded to finally obtain the outer layer SMC material;

[0069] Specifically: in step 1, the unsaturated resin is one of bisphenol A type unsaturated polyester and halogenated unsaturated polyester, the resin content is 28-33wt%, the length of the carbon fiber is 4-6cm, and the content is 25-34wt%;

[0070] In step 1, the hardener is one or more of TBPO and BPO, with a content of 2-3 wt%;

[0071] In step 1, the filler is one or more of barium sulfate and talc, with a content of 28-33 wt%;

[0072] In step 1, the surfactant is one or more of sodium lauryl sulfate, lauryl dimethylamine oxide, and alkyl alcohol amide, and the content is 2-3 wt%;

[0073] In step 1, the thickener is one or more of magnesium oxide, calcium oxide, and calcium hydroxide, and the content is 2-3 wt%;

[0074] In step 1, the thickness of the outer layer SMC material is finally obtained to be 9-12 mm;

[0075] In step 1, the flame retardant is aluminum hydroxide, and the content is 2-3 wt%.

[0076] In step 2 (step S2), a polystyrene foam board is processed: a polystyrene foam board is selected, silver is plated on one side of the polystyrene foam board by silver mirror reaction to form a silver-plated layer, and then the polystyrene foam board is cut into long strips;

[0077] Specifically, in step 2, the polystyrene foam board selected is a Class A fireproof material, the width of the polystyrene foam board strip is 1-2 cm, the thickness is 3-5 mm, and the thickness of the silver plating layer is 15 microns.

[0078] Step three (step S3), assembly: assemble the polystyrene foam board strips as the inner layer structure of the new energy vehicle battery box with a wide temperature range, and finally assemble the inner layer and the outer layer.

[0079] Specifically:

[0080] In step 3, the outer layer structure is the SMC material in step 1 or a lightweight aluminum alloy;

[0081] In step 3, the distance between the outer structure and the inner structure is half the width of the polystyrene foam board strip + 5mm;

[0082] In step 3, the silver-plated side of the polystyrene foam board strip is the side close to the outer layer material;

[0083] In step 3, the skeleton and gears that string together the polystyrene foam board strips in the inner structure are made of aluminum alloy skeletons;

[0084] In step three, the inner structure is switched on and off by means of switches.

[0085] Exemplarily, it can be rotated 90° clockwise, wherein the rotation angle can be arbitrarily adjusted according to the external ambient temperature.

[0086] Further improvements can be made based on the above embodiments:

[0087] The unsaturated resin powder, filler, hardener, surfactant and flame retardant are uniformly mixed to form a mixture, and then the tackifier is added to the mixture to form a resin paste;

[0088] The resin paste is coated on a polyethylene film, and carbon fibers are sandwiched between two layers of polyethylene film;

[0089] The resin compound is impregnated into the carbon fiber felt by a compacting roller and compression molded to obtain the outer layer SMC material;

[0090] One side of the polystyrene foam sheet is silver-plated and cut to form the inner structure of the battery box.

[0091] Specifically, the method further includes: after forming the inner layer structure of the battery case, assembling the inner layer and the outer layer of the battery case;

[0092] The unsaturated resin powder, filler, hardener, surfactant and flame retardant are uniformly mixed into a mixture by a high-speed turbine mixer.

[0093] Example 9: This example discloses a composite material molded product for a new energy vehicle battery case suitable for use over a wide temperature range. The composite material molded product for a new energy vehicle battery case suitable for use over a wide temperature range includes a composite material for a new energy vehicle battery case. This example can be combined with any of the examples in this specification to form further examples, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific details of the resulting new examples will not be repeated here.

[0094] Example 10: This example discloses a new energy vehicle battery case composite material suitable for use over a wide temperature range. The new energy vehicle battery case composite material of this example is prepared using the new energy vehicle battery case composite material method described in any example of this specification. This example can be combined with any example of this specification to form further examples, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific details of the resulting new examples will not be repeated here.

[0095] Example 11: This example discloses a new energy vehicle battery case suitable for use in a wide temperature range. This example includes a composite material molded product for a new energy vehicle battery case. This example can be combined with any example in this specification to form further examples, as long as there are no technical conflicts or contradictions. Due to space limitations, the specific details of the resulting new examples will not be detailed here.

[0096] Example 12: The battery box of a new energy vehicle has a louver structure. This example can be combined with any example in this specification to form more examples, as long as there are no technical conflicts or contradictions. The specific content of the new examples will not be repeated due to space limitations.

[0097] Example 13: This example provides a specific application scenario of a method for preparing a composite material for a new energy vehicle battery case suitable for a wide temperature range:

[0098] Step 1: Prepare the outer SMC material: Use a high-speed turbine mixer to evenly mix unsaturated resin powder, filler, hardener, surfactant, and flame retardant into a paste. Then, add a tackifier to this mixture to form a resin paste. This paste is evenly applied to polyethylene film. Carbon fibers are sandwiched between two sheets of resin-paste-coated polyethylene film. The resin composite is then impregnated into the carbon fiber mat using a compacting roller. The resulting material is then stacked in three layers and compression molded to create the outer SMC material.

[0099] Step 2: Processing the polystyrene foam board: Select a polystyrene foam board, silver-plate one side of the polystyrene foam board by silver mirror reaction to form a silver-plated layer, and then cut it into long strips;

[0100] Step 3: Assembly: Assemble the polystyrene foam board strips as the inner layer structure of the new energy vehicle battery box with a wide temperature range, and finally assemble the inner layer and the outer layer.

[0101] Preferably, in step 1, the unsaturated resin is one of bisphenol A type unsaturated polyester and halogenated unsaturated polyester, the resin content is 28-33 wt%, and the carbon fiber is 4-6 cm long and contains 25-34 wt%.

[0102] Preferably, in step 1, the hardener is one or more of TBPO and BPO, with a content of 2-3 wt%.

[0103] Preferably, in step 1, the filler is one or more of barium sulfate and talc, with a content of 28-33 wt%.

[0104] Preferably, in step 1, the surfactant is one or more of sodium lauryl sulfate, dodecyl dimethylamine oxide, and alkyl alcohol amide, and the content is 2-3 wt%.

[0105] Preferably, in step 1, the thickener is one or more of magnesium oxide, calcium oxide, and calcium hydroxide, and the content is 2-3 wt%.

[0106] Preferably, in step 1, the thickness of the outer layer SMC material finally obtained is 9-12 mm.

[0107] Preferably, in step 1, the flame retardant is aluminum hydroxide, and the content is 2-3 wt%.

[0108] Preferably, in step 2, the polystyrene foam board selected is a Class A fireproof material, the width of the polystyrene foam board strip is 1-2 cm, the thickness is 3-5 mm, and the thickness of the silver-plated layer is 15 microns.

[0109] Preferably, in step three, the outer layer structure is the SMC material in step one or a lightweight aluminum alloy.

[0110] Preferably, in step three, the distance between the outer layer structure and the inner layer structure is half the width of the polystyrene foam board strip + 5 mm.

[0111] Preferably, in step three, the silver-plated side of the polystyrene foam board strip is the side close to the outer layer material.

[0112] Preferably, in step three, the skeleton and gears that string together the polystyrene foam board strips in the inner layer structure are aluminum alloy skeletons.

[0113] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, in step three, the inner structure is switched on and off by a switch and can be rotated 90° clockwise, wherein the rotation angle can be adjusted arbitrarily according to the external ambient temperature.

[0114] This embodiment can be combined with any embodiment in the specification of this application to form more embodiments, as long as there is no mutual conflict or contradiction in the technology. The specific content of the new embodiment formed will not be repeated due to space limitations.

[0115] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art in the art to which the present invention pertains. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with those in the context of the prior art and, unless specifically defined, will not be interpreted in an idealized or overly formal sense.

[0116] It should be noted that certain terms are used in this specification and claims to refer to specific components. Those skilled in the art will understand that different manufacturers may use different terms to refer to the same component. This specification and claims do not distinguish components based on differences in terms, but rather on differences in their functions.

[0117] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features that are included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, any one of the embodiments claimed in the claims may be used in any combination in the embodiments of the present invention.

[0119] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0120] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0121] All features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, may be combined in any manner. Any feature disclosed in this specification, unless otherwise stated, may be replaced by an alternative feature that is equivalent or serves a similar purpose. That is, unless otherwise stated, each feature is merely an example of a set of equivalent or similar features. Throughout this specification, like reference numerals indicate like elements.

[0122] Those skilled in the art will appreciate that the modules in the devices in the embodiments can be adaptively changed and set in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition they can be divided into multiple submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including corresponding claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including corresponding claims, abstracts and drawings) can be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0123] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0124] For the method steps disclosed in the above embodiments, for the purpose of simple description, the method steps are expressed as a series of action combinations. However, those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a composite material for a new energy vehicle battery box suitable for a wide temperature range, characterized in that: Specifically include: Step 1: Preparation of outer layer SMC material: Use a high-speed turbine mixer to evenly mix unsaturated resin powder, filler, hardener, surfactant, and flame retardant into a paste, then add a tackifier to the paste mixture to make a resin paste, evenly apply the resin paste on a polyethylene film, sandwich carbon fiber between two polyethylene films coated with resin paste, and then impregnate the resin composite into the carbon fiber felt through a compacting roller. The obtained material is stacked in three layers and compression molded to finally obtain the outer layer SMC material; Step 2: Processing the polystyrene foam board: Select a polystyrene foam board, silver-plate one side of the polystyrene foam board by silver mirror reaction to form a silver-plated layer, and then cut the polystyrene foam board into long strips; the polystyrene foam board selected is a Class A fireproof material, the width of the polystyrene foam board strip is 1-2 cm, the thickness is 3-5 mm, and the thickness of the silver-plated layer is 15 microns; Step 3. Assembly: Assemble the polystyrene foam board strips as the inner structure of the new energy vehicle battery box with a wide temperature range, and finally assemble the inner and outer layers; the distance between the outer structure and the inner structure is half the width of the polystyrene foam board strip plus 5mm; the silver-plated side of the polystyrene foam board strip is the side close to the outer material; the skeleton and gears that string the polystyrene foam board strips in the inner structure are aluminum alloy skeletons; the inner structure is an electric blind curtain structure, and the inner structure is switched on and off by a switch.

2. The method for preparing a composite material for a new energy vehicle battery case suitable for a wide temperature range according to claim 1, characterized in that: In step 1, the unsaturated resin is one of bisphenol A type unsaturated polyester and halogenated unsaturated polyester, the resin content is 28-33wt%, the length of the carbon fiber is 4-6cm, and the content is 25-34wt%; In step 1, the hardener is one or more of TBPO and BPO, with a content of 2-3 wt%; In step 1, the filler is one or more of barium sulfate and talc, with a content of 28-33 wt%; In step 1, the surfactant is one or more of sodium lauryl sulfate, lauryl dimethylamine oxide, and alkyl alcohol amide, and the content is 2-3 wt%; In step 1, the thickener is one or more of magnesium oxide, calcium oxide, and calcium hydroxide, and the content is 2-3 wt%; In step 1, the thickness of the outer layer SMC material is finally obtained to be 9-12 mm; In step 1, the flame retardant is aluminum hydroxide, and the content is 2-3 wt%.

3. A composite material for new energy vehicle battery cases suitable for a wide temperature range, characterized in that: The new energy vehicle battery case composite material is prepared by the method described in any one of claims 1 to 2.

4. A composite material molded product for a new energy vehicle battery box suitable for a wide temperature range, characterized in that: The new energy vehicle battery case composite material molded product suitable for a wide temperature range includes the new energy vehicle battery case composite material as described in claim 3.

5. A new energy vehicle battery box suitable for a wide temperature range, characterized in that: The new energy vehicle battery case suitable for a wide temperature range includes the new energy vehicle battery case composite material molded product as described in claim 4.

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