Battery fireproof separator, preparation method thereof, battery module and new energy vehicle

Abstract

The application provides a battery fireproof partition plate and a preparation method thereof, a battery module and a new energy vehicle. The battery fireproof partition plate comprises a high-temperature heat-resistant insulating sheet, and the high-temperature heat-resistant insulating sheet is arranged on the outer side of a modified polyurethane fireproof core plate. The modified polyurethane fireproof core plate comprises component A and component B. Component A comprises 30-50 parts of medium-functionality polyether polyol, 1-5 parts of a catalyst, 1-10 parts of an organic phosphate, 10-25 parts of melamine phosphate, 1-10 parts of a low-functionality chain extender, 1-10 parts of pentaerythritol, 1-10 parts of aluminum hydroxide, 1-10 parts of hollow glass microbeads and 1-5 parts of a smoke suppressant. Component B comprises 20-40 parts of an isocyanate mixture. The battery fireproof partition plate not only has a good mechanical protection effect, but also improves the fireproof and heat insulation performance of the battery fireproof partition plate, that is, the fireproof and heat insulation time of the battery fireproof partition plate is 300 s at a temperature above 1300 DEG C, thereby effectively preventing the flame energy from spreading to the surrounding.

Description

Technical Field

[0001] This invention relates to the field of new energy fire protection technology, and in particular to a battery fireproof separator and its preparation method, a battery module, and a new energy vehicle. Background Technology

[0002] To meet range requirements, new energy vehicle power battery modules typically employ multi-cell battery packs when constructing large-capacity batteries. These cell packs are then connected in series and parallel to increase voltage and capacity. Finally, a BMS (Battery Management System) is used to manage the battery system, thus completing the assembly and production of the new energy vehicle power battery module.

[0003] During operation, new energy vehicles may experience a fire caused by an accidental collision or a short circuit / overload of the battery. The heat released rapidly during the fire can cause the flammable materials in the new energy vehicle to burn quickly, potentially leading to accidents such as injuries or fatalities.

[0004] To protect the safety of battery modules, an independent protective compartment is usually designed outside the battery module, and a fireproof partition is also installed on the protective compartment. For example, patent CN109436516A discloses a fireproof storage device for finished lithium batteries. Although the multi-layer fireproof and heat-insulating board can provide a certain degree of high-temperature fire protection for the battery module, the fire protection is relatively weak.

[0005] To further enhance the high-temperature fire protection capabilities of battery modules, some manufacturers have opted for environmentally friendly and heat-resistant ceramic fiber fire blankets. However, this method still suffers from relatively weak fire protection. According to some domestic data, the fire-resistant performance of ceramic fiber fire blankets completely fails within 30 minutes of exposure to 800℃. Therefore, with the increasing energy density of power battery modules in new energy vehicles, high-density battery modules can reach temperatures exceeding 1300℃ during combustion. Traditional fireproof partitions become completely ineffective at temperatures above 1300℃, allowing flames to spread rapidly and release large amounts of heat, particles, and harmful gases. This fails to effectively prevent the ignition of surrounding flammable materials, potentially causing damage between battery cells and even the entire battery compartment and vehicle body. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery fireproof partition with high fire resistance and heat insulation performance, good corrosion resistance, high mechanical strength and sound insulation, as well as its preparation method, battery module and new energy vehicle.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A battery fireproof partition includes a high-temperature heat-resistant insulating sheet, and the battery fireproof partition further includes a modified polyurethane fireproof core board.

[0009] The high-temperature heat-resistant insulating sheet is disposed on the outside of the modified polyurethane fireproof core board;

[0010] The modified polyurethane fireproof core board comprises component A and component B;

[0011] Component A comprises the following components:

[0012]

[0013] Component B comprises the following components:

[0014] 20-40 parts of isocyanate mixture.

[0015] In one embodiment, the functionality of the medium-functionality polyether polyol is 3, and the hydroxyl value of the medium-functionality polyether polyol is 300 mg KOH / g to 650 mg KOH / g.

[0016] In one embodiment, the low-functionality chain extender includes at least one of diols, diamines, and ethanolamines.

[0017] In one embodiment, the high-temperature heat-resistant insulating sheet is mica paper.

[0018] In one embodiment, the number of high-temperature heat-resistant insulating sheets is two, and the two high-temperature heat-resistant insulating sheets are respectively located on both sides of the modified polyurethane fireproof core board.

[0019] A method for preparing a battery fireproof separator, wherein the battery fireproof separator described in any of the above embodiments is prepared by the method described above.

[0020] In one embodiment, the method for preparing the battery fireproof separator includes the following steps:

[0021] The A component and the B component are mixed to obtain a modified polyurethane mixture;

[0022] The modified polyurethane mixture is poured onto the high-temperature heat-resistant insulating sheet to obtain battery fireproof partition semi-finished product A;

[0023] The battery fireproof separator semi-finished product A is coated to obtain battery fireproof separator semi-finished product B;

[0024] The battery fireproof partition semi-finished product B is subjected to roll pressing and curing operation to obtain the battery fireproof partition.

[0025] In one embodiment, a continuous coating roller press is used for the pouring operation, coating operation and roller pressing curing operation.

[0026] A battery module includes a housing, multiple battery packs, and multiple battery fireproof partitions as described in any of the above embodiments. A protective compartment is formed inside the housing, and each battery pack is spaced apart in the protective compartment. Each battery fireproof partition is located between a battery pack and a side wall of the protective compartment, and / or...

[0027] Each of the battery fireproof partitions is located between each pair of adjacent battery packs.

[0028] A new energy vehicle, the new energy vehicle including the battery module described in any of the above embodiments.

[0029] Compared with the prior art, the present invention has at least the following advantages:

[0030] 1) The aforementioned battery fireproof separator, when mixed with component A (medium-functionality polyether polyol, low-functionality chain extender) and component B (isocyanate), can rapidly cross-link and solidify on a high-temperature heat-resistant insulating sheet to form a three-dimensional polymer. Simultaneously, this three-dimensional polymer can polymerize organic phosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants, thus producing a battery fireproof separator with high fire resistance, heat insulation, corrosion resistance, and mechanical strength. This not only provides good mechanical protection but also enhances the fire resistance and heat insulation performance of the battery fireproof separator. Specifically, the fireproof separator provides 300 seconds of fire resistance and heat insulation at temperatures above 1300℃. This effectively prevents the flames from spreading when the battery module catches fire, effectively preventing the fault point from igniting surrounding flammable materials, thereby avoiding damage between battery cells or even the entire battery compartment and vehicle body.

[0031] 2) The aforementioned battery fireproof separator uses organic phosphate esters, melamine phosphate, and pentaerythritol as a flame-retardant expansion system. When exposed to fire, it rapidly carbonizes and expands to form a dense carbonized layer. After expansion, the carbonized material has a dense and stable structure with extremely low thermal conductivity, which can effectively prevent the continuous damage of flames and high temperatures to the battery module, thus extending the fireproof and heat insulation time above 1300℃. Furthermore, the flame-retardant expansion system of organic phosphate esters, melamine phosphate, and pentaerythritol does not contain chlorine or bromine, resulting in superior UV resistance and non-yellowing performance of the battery fireproof separator, making it particularly suitable for applications in new energy vehicles.

[0032] 3) The battery fireproof partition described above, since components A and B directly penetrate into the interior of the high-temperature heat-resistant insulating sheet and are cured on the high-temperature heat-resistant insulating sheet to form a modified polyurethane fireproof core board, does not require the use of adhesives between the high-temperature heat-resistant insulating sheet and the modified polyurethane fireproof core board to obtain a battery fireproof partition with high mechanical strength, high fireproof and heat insulation performance and good corrosion resistance.

[0033] 4) The above-mentioned battery fireproof partition, due to the addition of aluminum hydroxide and hollow glass microspheres, not only improves the fireproof and flame-retardant performance of the flame-retardant expansion system, but also improves the mechanical strength of the battery fireproof partition. In addition, the hollow glass microspheres can also reduce weight and provide sound insulation, so as to ensure that the battery fireproof partition is lightweight, has high fireproof and flame-retardant properties, high mechanical strength and good sound insulation effect. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a flowchart of a battery fireproof separator preparation method according to an embodiment of the present invention;

[0036] Figure 2 This is a cross-sectional view of a battery fireproof partition according to an embodiment of the present invention;

[0037] Figure 3 This is an experimental diagram showing the heat insulation performance test of a battery fireproof partition according to an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the structure of a continuous coating roller pressing device according to an embodiment of the present invention from one direction;

[0039] Figure 5 for Figure 4 A schematic diagram of the structure of the continuous coating roller pressing device for battery fireproof partitions from another direction.

[0040] Figure 6 This is a schematic diagram of a V-shaped connection between a coating assembly and a cleaning assembly according to an embodiment of the present invention.

[0041] Figure 7 This is a trajectory diagram of the casting component during the casting process according to an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the structure in which the coating component and the cleaning component are connected in a V-shape with an obtuse angle, according to another embodiment of the present invention.

[0043] Figure 9 for Figure 8 The enlarged view of point A shown below;

[0044] Figure 10 This is a schematic diagram of the partial finished product structure of a continuous coating roller pressing device according to an embodiment of the present invention;

[0045] Figure 11 This is a schematic diagram of the product structure of a battery module according to an embodiment of the present invention.

[0046] Reference numerals: 10. Continuous coating roller pressing device for battery fireproof partitions; 100. Frame; 210. First fixed roller; 220. Second fixed roller; 300. Conveying assembly; 310. Conveying channel; 400. Coating assembly; 410. Mounting frame; 420. Scraper; 421. Buffer shrinkage section; 422. Horizontal section; 423. Buffer widening section; 430. Coating chamber; 440. Anti-overflow baffle; 500. Roller pressing assembly; 510. First roller pressing belt 520, Second roller pressing belt; 530, First roller; 540, Second roller; 600, Casting assembly; 610, Slide rail guide structure; 620, Casting machine; 621, Casting head; 700, Cleaning assembly; 710, Third fixed roller; 720, Fourth fixed roller; 800, First correction roller; 900, Second correction roller; 910, Battery fireproof partition semi-finished product A; 920, Battery fireproof partition semi-finished product B; 1000, Cutting assembly;

[0047] 20. Battery fireproof partition; 201. High-temperature heat-resistant insulation sheet; 202. Modified polyurethane fireproof core board. Specific Implementation

[0048] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0049] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] This application provides a battery fireproof partition, including a high-temperature heat-resistant insulating sheet. The battery fireproof partition further includes a modified polyurethane fireproof core board, and the high-temperature heat-resistant insulating sheet is disposed on the outside of the modified polyurethane fireproof core board. The modified polyurethane fireproof core board includes component A and component B. Component A includes the following components: 30-50 parts of medium-functionality polyether polyol; 1-5 parts of catalyst; 1-10 parts of organophosphate; 10-25 parts of melamine phosphate; 1-10 parts of low-functionality chain extender; 1-10 parts of pentaerythritol; 1-10 parts of aluminum hydroxide; 1-10 parts of hollow glass microspheres; and 1-5 parts of smoke suppressant. Component B includes the following components: 20-40 parts of isocyanate mixture.

[0052] The aforementioned battery fireproof separator, when mixed with a medium-functionality polyether polyol (component A), a low-functionality chain extender, and an isocyanate (component B), can rapidly cross-link and solidify on a high-temperature heat-resistant insulating sheet to form a three-dimensional polymer. This three-dimensional polymer can polymerize organic phosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants, resulting in a battery fireproof separator with high fire resistance, heat insulation, corrosion resistance, and mechanical strength. This not only provides good mechanical protection but also enhances the fire resistance and heat insulation performance, achieving a fireproof and heat-insulating time of 300 seconds at temperatures above 1300℃. This effectively prevents the flames from spreading when the battery module catches fire, effectively preventing the fault point from igniting surrounding flammable materials, thus avoiding damage between battery cells or even the entire battery compartment and vehicle body. Furthermore, by using organophosphates, melamine phosphates, and pentaerythritol as the flame-retardant expansion system, the material rapidly carbonizes and expands upon contact with fire to form a dense carbonized layer. This carbonized material, after expansion, has a dense and stable structure with extremely low thermal conductivity, effectively preventing continuous damage to the battery module from flames and high temperatures. This extends the fireproof and heat-insulating time above 1300℃. Moreover, the flame-retardant expansion system of organophosphates, melamine phosphates, and pentaerythritol does not contain chlorine or bromine, resulting in superior UV resistance and non-yellowing of the battery fireproof separator, making it particularly suitable for applications in new energy vehicles. Furthermore, because components A and B directly penetrate into the interior of the high-temperature heat-resistant insulating sheet and cure on it to form a modified polyurethane fireproof core board, no adhesive is needed between the high-temperature heat-resistant insulating sheet and the modified polyurethane fireproof core board to obtain a battery fireproof separator with high mechanical strength, high fireproof and heat-insulating performance, and good corrosion resistance. Furthermore, the added aluminum hydroxide and hollow glass microspheres not only improve the fire-retardant performance of the flame-retardant expansion system, but also enhance the mechanical strength of the battery fireproof separator. In addition, the hollow glass microspheres can also reduce weight and provide sound insulation, thus ensuring a lightweight battery fireproof separator with high fire resistance, high mechanical strength, and good sound insulation.

[0053] To better understand the technical solution and beneficial effects of this application, the following detailed description is provided in conjunction with specific embodiments:

[0054] like Figure 2As shown, a battery fireproof partition 20 of one embodiment includes a high-temperature heat-resistant insulating sheet 201. The battery fireproof partition also includes a modified polyurethane fireproof core board 202. The high-temperature heat-resistant insulating sheet 201 is disposed on the outside of the modified polyurethane fireproof core board 202. The modified polyurethane fireproof core board 202 includes component A and component B. Component A includes the following components: 30-50 parts of medium-functionality polyether polyol; 1-5 parts of catalyst; 1-10 parts of organophosphate; 10-25 parts of melamine phosphate; 1-10 parts of low-functionality chain extender; 1-10 parts of pentaerythritol; 1-10 parts of aluminum hydroxide; 1-10 parts of hollow glass microspheres; and 1-5 parts of smoke suppressant. Component B includes the following components: 20-40 parts of isocyanate mixture.

[0055] It is understandable that the mixture of medium-functionality polyether polyol (component A), low-functionality chain extender, and isocyanate (component B) can rapidly cross-link and solidify on the high-temperature heat-resistant insulating sheet to form a three-dimensional polymer. Simultaneously, this three-dimensional polymer can polymerize organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants, thereby producing a battery fireproof separator with high fire resistance, heat insulation, corrosion resistance, and high mechanical strength. This allows the battery fireproof separator to not only provide good mechanical protection but also improve its fire resistance and heat insulation performance. Specifically, when exposed to flame, the modified polyurethane fireproof core board can expand more than 10 times, achieving a fireproof and heat-insulating time of 300 seconds at flames above 1300℃. This effectively prevents the flame from spreading when the battery module catches fire, effectively preventing the fault point from igniting surrounding flammable materials, thus avoiding damage between battery cells or even the entire battery compartment and vehicle body.

[0056] It should be noted that since new energy vehicles are typically driven outdoors in relatively harsh environments, such as frequent rain, high UV radiation, and significant vibration, the requirements for the corrosion resistance, mechanical strength, and fire and heat insulation properties of battery fireproof separators are high. Currently, traditional battery fireproof separators have poor fire and heat insulation and UV resistance. Therefore, in this application, an organophosphate, melamine phosphate, and pentaerythritol are used as a flame-retardant expansion system. Upon exposure to fire, the system rapidly carbonizes and expands to form a dense carbonized layer. After expansion, this carbonized material has a dense and stable structure with extremely low thermal conductivity, effectively preventing continuous damage to the battery module from flames and high temperatures. This extends the fire and heat insulation time above 1300℃. Furthermore, the flame-retardant expansion system of organophosphate, melamine phosphate, and pentaerythritol does not contain chlorine or bromine, resulting in superior UV resistance and non-yellowing performance of the battery fireproof separator, making it particularly suitable for applications in new energy vehicles. It is worth mentioning that since organophosphates, melamine phosphates, and pentaerythritol are all environmentally friendly flame-retardant expansion systems, they are more environmentally friendly.

[0057] Furthermore, since components A and B directly penetrate into the interior of the high-temperature heat-resistant insulation sheet and cure on the high-temperature heat-resistant insulation sheet to form a modified polyurethane fireproof core board, no adhesive is needed between the high-temperature heat-resistant insulation sheet and the modified polyurethane fireproof core board to obtain a battery fireproof partition with high mechanical strength, high fireproof and heat insulation performance, and good corrosion resistance.

[0058] It should also be noted that aluminum hydroxide decomposes into aluminum oxide and water at a high temperature of 300℃. This means that aluminum hydroxide needs to absorb heat during decomposition and water vaporization, which further improves the fire-retardant performance of the flame-retardant expansion system. At the same time, the added aluminum hydroxide can also improve the mechanical strength of the battery fireproof separator, ensuring that the battery fireproof separator can provide good mechanical protection. Meanwhile, the added hollow glass microspheres are a new type of lightweight physical fireproof and heat-insulating material. They can form multiple three-dimensional fireproof and heat-insulating cavities in the three-dimensional polymer, allowing multiple hollow glass microspheres to absorb a large amount of heat, thereby further improving the fire-retardant performance of the flame-retardant expansion system. They can also provide multiple support points for the three-dimensional polymer, thereby better improving the mechanical strength of the battery fireproof separator. In addition, hollow glass microspheres can effectively reduce the weight of modified polyurethane fireproof core boards, ensuring the preparation of lightweight battery separators with high fire resistance and flame retardancy. This avoids excessive weight increases in battery modules, which could lead to higher energy consumption in new energy vehicles. Furthermore, the added hollow glass microspheres also have good sound insulation properties, effectively reducing noise during the operation of new energy vehicles.

[0059] It is worth mentioning that the organic phosphate ester, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressant are polymerized within a three-dimensional polymer. This allows the three-dimensional polymer to effectively contain the organic phosphate ester, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressant within the polymer, ensuring cross-linking and curing to obtain a three-dimensional modified polyurethane fireproof core board. Furthermore, the hollow structure formed by the hollow glass microspheres within the modified polyurethane fireproof core board allows for better heat and noise containment, thus significantly improving the fireproof, heat-insulating, and sound-insulating performance of the battery fireproof separator. Combined with the chemical flame-retardant effects of the organic phosphate ester, melamine phosphate, pentaerythritol, and aluminum hydroxide, and the use of high-temperature heat-resistant insulating sheets, a lightweight, high-mechanical-strength, high-fireproof, heat-insulating, and sound-insulating battery fireproof separator is prepared, better suited for applications in new energy vehicles.

[0060] In one embodiment, the functionality of the medium-functionality polyether polyol is 3, and the hydroxyl value of the medium-functionality polyether polyol is 300 mg KOH / g to 650 mg KOH / g.

[0061] It is understandable that if a high-functionality polyether polyol (functionality greater than 3) is used, the viscosity of the mixture of component A and component B will be very high. This is not conducive to the polymerization and dispersion of the polyether polyol with organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants. Consequently, a significant amount of organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants cannot be polymerized within the three-dimensional polymer, resulting in lower fire-resistant and heat-insulating performance and mechanical strength of the battery fireproof separator. If a low-functionality polyether polyol (functionality less than 3) is used, not only will the viscosity be low, but it will also fail to provide sufficient crosslinking and rigidity. This will prevent the polymerization of organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants, thus failing to ensure a battery fireproof separator with good fire-resistant and heat-insulating performance and high mechanical strength.

[0062] Therefore, in this application, a medium-functionality polyether polyol with an average functionality of 3 is used to ensure that the hydroxyl value of the medium-functionality polyether polyol is 300 mg KOH / g to 650 mg KOH / g. This ensures that the medium-functionality polyether polyol can produce sufficient crosslinking degree, rigidity, and suitable viscosity, so that the medium-functionality polyether polyol can form a linear polymer after chain extension reaction with a low-functionality chain extender, and then crosslink with isocyanate to form a three-dimensional polymer. This ensures that the three-dimensional polymer can polymerize organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants, in order to prepare a modified polyurethane fireproof core board with stable structure, high mechanical strength, and good fireproof and heat insulation performance. Specifically, the medium-functionality polyether polyol with an average functionality of 3 can be the TMN 400 polyether polyol provided by Tianjin Petrochemical Plant No. 3.

[0063] In this embodiment, the low-functionality chain extender refers to a chain extender with a functionality of 2. This ensures that the low-functionality chain extender has a shorter linear structure, thereby ensuring a relatively dense three-dimensional structure. This allows for the polymerization of 1-10 parts of organophosphate ester, 10-25 parts of melamine phosphate, 1-10 parts of pentaerythritol, 1-10 parts of aluminum hydroxide, 1-10 parts of hollow glass microspheres, and 1-5 parts of smoke suppressant, thus ensuring a modified polyurethane fireproof core board with stable structure, high mechanical strength, and good fire and heat insulation properties. Specifically, in one embodiment, the low-functionality chain extender includes at least one of diol, diamine, and ethanolamine. It is understood that since diol, diamine, and ethanolamine are small-molecule multifunctional linear molecules, this ensures that the medium-functionality polyether polyol forms a linear polymer after the chain extension reaction with the low-functionality chain extender.

[0064] In one embodiment, the high-temperature heat-resistant insulating sheet is mica paper. It is understood that because mica paper has the characteristics of high temperature resistance (800℃-1000℃) and good insulation properties, it can be used as the outer protective layer of the battery fireproof separator. Especially when used in conjunction with modified polyurethane fireproof core board, it can greatly improve the mechanical strength, fireproof and heat insulation performance, corrosion resistance, and sound insulation performance of the battery fireproof separator.

[0065] like Figure 2As shown, in one embodiment, there are two high-temperature heat-resistant insulating sheets 201, which are respectively located on both sides of the modified polyurethane fireproof core board 202. It can be understood that by placing the two high-temperature heat-resistant insulating sheets 201 on both sides of the modified polyurethane fireproof core board 202, components A and B of the modified polyurethane fireproof core board 202 can be well cross-linked and cured onto the two high-temperature heat-resistant insulating sheets 201. This allows the two high-temperature heat-resistant insulating sheets 201 to form a sandwich-type battery fireproof partition with the modified polyurethane fireproof core board 202. On the one hand, the two high-temperature heat-resistant insulating sheets 201 can provide good protection to both sides of the modified polyurethane fireproof core board 202, ensuring that the battery fireproof partition has good mechanical strength and improving its fireproof and heat-insulating performance. On the other hand… The two high-temperature heat-resistant insulating sheets 201 can form a spacer channel, which enables the two high-temperature heat-resistant insulating sheets 201 to have a preliminary noise reduction effect on the external noise. Combined with the multiple hollow glass microspheres of the modified polyurethane fireproof core board 202, the sound insulation performance of the battery fireproof partition can be further improved to better adapt to the sound insulation and vibration reduction effect of the operation of new energy vehicles. On the other hand, the two high-temperature heat-resistant insulating sheets 201 can ensure that both sides of the battery fireproof partition have fireproof and heat insulation effects, so that users can install and place it at will during battery module assembly and production without distinguishing between the front and back of the battery fireproof partition, thereby improving the efficiency of battery module production.

[0066] In one embodiment, the mica paper is less than 0.5 mm thick to ensure the preparation of a thin battery fireproof partition, which is better suited for the application of miniaturized high-energy-density battery modules in the market.

[0067] In one embodiment, the hollow glass microspheres have a particle size of 50μm-100μm. Specifically, the hollow glass microspheres are YN20 type hollow glass microspheres provided by Guangzhou Yuanyuan New Materials Co., Ltd., and are especially used in conjunction with aluminum hydroxide with a particle size of 800 mesh to ensure that the hollow glass microspheres and aluminum hydroxide can be well polymerized within the three-dimensional polymer, thereby ensuring the obtaining of a lightweight battery fireproof separator with high fire resistance, high mechanical strength, and good sound insulation.

[0068] In one embodiment, the isocyanate mixture comprises a mixture of polymethylene polyphenyl isocyanate and modified MDI (liquefied MDI). It is understood that because polymethylene polyphenyl isocyanate (PAPI) molecules contain multiple rigid benzene rings and have a high average functionality, they can be crosslinked with medium-functionality polyether polyols to prepare three-dimensional polymers with good mechanical strength. Furthermore, because modified MDI (liquefied MDI) is relatively stable in storage, when used in combination with polymethylene polyphenyl isocyanate, it can prepare high-performance microporous polyurethane elastomers, cold-cured molding foams, self-skinning foams, and semi-rigid foam products, ensuring the production of lightweight, fire-retardant, high-mechanical-strength, and sound-insulating battery fireproof separators, which are also easier to process.

[0069] In a preferred embodiment, the NCO mass fraction of the polymethylene polyphenyl isocyanate is 31%–32%, and the average molecular weight is in the range of 300–400. This ensures that the polymethylene polyphenyl isocyanate molecule contains multiple rigid benzene rings and a high average functionality, thus ensuring that it can be crosslinked with medium-functionality polyether polyols to prepare a three-dimensional polymer with good mechanical strength. Specifically, the polymethylene polyphenyl isocyanate is PM-400 provided by Wanhua Chemical Company, and the modified MDI (liquefied MDI) is liquefied MDI provided by Desmodur CD Bayer.

[0070] This application also provides a method for preparing a battery fireproof separator, wherein the battery fireproof separator described in any of the above embodiments is prepared by the method described above.

[0071] Please see Figure 1 To better understand the technical solution and beneficial effects of the battery fireproof separator preparation method of this application, the following detailed description of the battery fireproof separator preparation method of this application is provided in conjunction with specific embodiments. One embodiment of the battery fireproof separator preparation method includes some or all of the following steps:

[0072] S100. Mix the A component and the B component to obtain a modified polyurethane mixture.

[0073] It is understandable that the modified polyurethane fireproof core board is prepared according to its components, and then the weighed component A and component B are mixed evenly to obtain a modified polyurethane mixture.

[0074] S200. The modified polyurethane mixture is poured onto the high-temperature heat-resistant insulating sheet to obtain a battery fireproof partition semi-finished product A.

[0075] It is understood that by pouring the uniformly mixed modified polyurethane mixture onto the high-temperature heat-resistant insulating sheet, the modified polyurethane mixture can be well distributed on the high-temperature heat-resistant insulating sheet, resulting in a battery fireproof separator semi-finished product A. This ensures that during subsequent coating operations, the modified polyurethane mixture can be uniformly coated onto the high-temperature heat-resistant insulating sheet.

[0076] S300. The battery fireproof partition semi-finished product A is coated to obtain battery fireproof partition semi-finished product B, so as to ensure that the modified polyurethane mixture is uniformly coated on the high temperature heat-resistant insulating sheet, so that the subsequent roll curing operation can be better performed.

[0077] S400. Roller pressing and curing operation is performed on the battery fireproof partition semi-finished product B to obtain the battery fireproof partition, so that the modified polyurethane mixture can be cured and molded on the high temperature heat-resistant insulating sheet to quickly prepare the battery fireproof partition.

[0078] The above-mentioned method for preparing a battery fireproof partition involves first pouring a modified polyurethane mixture onto a high-temperature heat-resistant insulating sheet to achieve initial distribution of the modified polyurethane mixture on the high-temperature heat-resistant insulating sheet, thereby obtaining a battery fireproof partition semi-finished product A. Then, the modified polyurethane mixture is uniformly coated on the battery fireproof partition semi-finished product A to obtain a battery fireproof partition semi-finished product B. Finally, the battery fireproof partition semi-finished product B is subjected to a roll-press curing operation to prepare a lightweight battery fireproof partition with high fire resistance, high mechanical strength, and good sound insulation.

[0079] like Figure 7 As shown, in one embodiment, the step of pouring the modified polyurethane mixture onto the high-temperature heat-resistant insulating sheet includes the following specific steps: pouring the modified polyurethane mixture onto the high-temperature heat-resistant insulating sheet using a serpentine repeated pouring method, so as to better distribute the modified polyurethane mixture more evenly on the high-temperature heat-resistant insulating sheet, so that the modified polyurethane mixture can be quickly and evenly coated onto the high-temperature heat-resistant insulating sheet during subsequent coating operations.

[0080] In one embodiment, after the step of performing roll forming and curing on the semi-finished battery fireproof partition B, the following step is further included: cutting the battery fireproof partition to obtain a battery fireproof partition that meets production requirements.

[0081] To improve the production efficiency of battery fireproof separators, in one embodiment, a continuous coating roller pressing device is used for casting, coating and roller pressing curing operations.

[0082] It is understandable that the continuous coating roller pressing device can realize the three-in-one operation of pouring, coating and roller pressing curing of modified polyurethane mixture. Compared with the traditional molding process, it does not require the energy consumption of mold heating, and can realize large-scale continuous production. Moreover, each production link becomes more compact. Thus, it greatly improves the production efficiency of battery fireproof separators, and saves energy, reduces consumption and lowers costs.

[0083] It should also be noted that in practical applications, the applicant uses SMC compression molding to prepare the battery fireproof separator. First, a sheet of mica paper is laid flat at the bottom of a mold of a certain size. Another sheet of mica paper is vacuum-adsorbed onto the mold cover. Simultaneously, the bottom of the mold and the cover are kept at a constant temperature of 50–100°C. Then, a modified polyurethane mixture is injected into the mold. After the cover is closed and fixed, the modified polyurethane mixture undergoes a polymerization reaction and solidifies (for more than 30 minutes). It is then removed for secondary curing before finally being cut to obtain the battery fireproof separator. As can be seen, the SMC compression molding process is actually an intermittent casting compression molding process. This not only results in discontinuous production and low production efficiency, but also requires mold heating during the curing process to promote curing, which can cause delayed catalytic activation and other adverse effects, affecting the rapid cross-linking and curing of the modified polyurethane mixture. Therefore, when using a continuous coating roller press for casting, coating and roller pressing curing operations, there is no need to provide energy for mold heating, and large-scale continuous casting production can be achieved, making each production link more compact.

[0084] like Figure 4 and Figure 5 As shown, this continuous coating roller pressing device is designed to connect the casting, coating, and roller pressing curing operations. In one embodiment, the continuous coating roller pressing device includes a frame 100, a fixing assembly, a conveying assembly 300, a coating assembly 400, and a roller pressing assembly 500. The conveying assembly 300 is movably mounted on the frame 100 and forms a conveying channel 310. The fixing assembly, the coating assembly 400, and the roller pressing assembly 500 are arranged along the conveying assembly 300. The fixing assembly includes a first fixing roller 210 and a second fixing roller 220. The second fixed roller 220 is located on both sides of the conveying assembly 300, and the first fixed roller 210 and the second fixed roller 220 are rotatably mounted on the frame 100. The continuous coating roller pressing device also includes a casting assembly 600, which is disposed on one side of the coating assembly 400 and is movably mounted on the frame 100. The casting assembly 600 has a casting head 621, which is positioned toward the conveying channel 310.

[0085] It is understood that, since the first fixed roller 210 and the second fixed roller 220 are respectively located on both sides of the conveying assembly 300, and the first fixed roller 210 and the second fixed roller 220 are respectively rotatably mounted on the frame 100, the first fixed roller 210 is used to place the first mica roll, and the second fixed roller 220 is used to place the second mica roll. Furthermore, since the fixing assembly, coating assembly 400, and rolling assembly 500 are arranged along the conveying assembly 300, and a casting assembly 600 is added to one side of the coating assembly 400, the casting assembly 600 has a casting head 621, which faces the conveying channel 310. When the conveying assembly 300, the first fixed roller 210, and the second fixed roller 220 are connected to an external power source, the first mica roll placed on the first fixed roller 210 can enter the conveying channel 310 as the conveying assembly 300 moves. At this time, the casting assembly 600 can cast the mixed modified polyurethane mixture onto the first mica roll on the conveying channel 310, thus achieving the desired effect. The modified polyurethane mixture is poured onto the high-temperature heat-resistant insulating sheet to obtain a battery fireproof separator semi-finished product A910. Then, the conveying assembly 300 conveys the battery fireproof separator semi-finished product A910 from the conveying channel 310 to the coating assembly 400. The coating assembly 400 then uniformly coats the battery fireproof separator semi-finished product A910 with the modified polyurethane mixture to achieve the coating operation of the battery fireproof separator semi-finished product A910, resulting in a battery fireproof separator semi-finished product B920. Next, the conveying assembly 300 will convey the battery fireproof partition semi-finished product B920 on the conveying channel 310 to the second fixed roller 220, so that the second mica roll on the second fixed roller 220 can cover the battery fireproof partition semi-finished product B920. Finally, it passes through the rolling assembly 500 to realize the rolling curing operation of the battery fireproof partition semi-finished product B920, so that the modified polyurethane mixture can crosslink and cure between the two mica rolls, thereby completing the continuous casting production of the battery fireproof partition.

[0086] It should be noted that, due to the relatively high viscosity of the modified polyurethane mixture, reaching 6000 mPa·s to 1000 mPa·s, it is difficult to uniformly coat the modified polyurethane mixture onto the first mica roll using traditional coating roller pressing equipment, resulting in uneven and uneven coating. Therefore, this application adds a casting component 600 to one side of the coating component 400. On the one hand, the casting component 600 can maintain a high temperature to ensure that the modified polyurethane mixture has good fluidity, which is beneficial for the subsequent coating component 400 to uniformly coat the modified polyurethane mixture onto the first mica roll, thereby ensuring a battery fireproof separator with high flatness. On the other hand, when the modified polyurethane mixture passes through the coating component 400, the coating component 400 can perform a certain amount of pre-extrusion on the modified polyurethane mixture, which not only helps to remove materials such as organophosphates and melamine phosphates from the surface of the modified polyurethane mixture. The pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressant are well pressed into the modified polyurethane mixture, which helps the three-dimensional polymer to effectively polymerize the organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressant during subsequent roll curing. Furthermore, it ensures sufficient and comprehensive contact between the modified polyurethane mixture and the first mica roll, increasing the contact area and ensuring the complete curing of the modified polyurethane mixture onto the first mica roll. This improves the connection strength between the modified polyurethane fireproof core board and the first mica roll.

[0087] It should also be noted that the added second mica roll facilitates the 500-roll operation of the roller pressing assembly, effectively preventing the modified polyurethane mixture from adhering to the rollers and thus reducing the fire resistance of the battery fireproof separator. Furthermore, the first and second mica rolls can form a sandwich layer, trapping the modified polyurethane mixture within it, creating a modified polyurethane fireproof core board between them. This provides better protection for both sides of the modified polyurethane fireproof core board, ensuring good mechanical strength of the battery fireproof separator and improving its fire resistance and heat insulation performance. A gap channel can be formed between the first and second mica rolls, allowing them to initially reduce external noise. Combined with the sound insulation effect of the modified polyurethane fireproof core board, this further improves the sound insulation performance of the battery fireproof partition, better adapting to the sound insulation and vibration reduction effects of new energy vehicles. On the other hand, the first and second mica rolls ensure that both sides of the battery fireproof partition have fireproof and heat insulation effects, allowing users to install and place it freely during battery module assembly and production without distinguishing between the front and back of the battery fireproof partition, thereby improving the efficiency of battery module production.

[0088] It is worth mentioning that, especially when used in conjunction with the roller pressing assembly 500, the effect of simultaneous pressing and curing is achieved. This allows the first and second mica rolls to effectively clamp and cure the modified polyurethane mixture within the interlayer. Simultaneously, the roller pressing assembly 500 can better compress the pre-pressed organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressant into the three-dimensional polymer, resulting in a battery fireproof separator with stable structure, lightweight, high fire resistance, high mechanical strength, and good sound insulation. Compared to traditional battery fireproof separators, the continuous coating roller pressing device of this application eliminates the need for mold heating energy consumption during casting, coating, and roller pressing curing operations. It also enables large-scale continuous casting production, making each production step more compact, and producing battery fireproof separators with stable structure, lightweight, high fire resistance, high mechanical strength, and good sound insulation.

[0089] like Figure 4 and Figure 5 As shown, in one embodiment, the casting assembly 600 includes a slide rail guide structure 610 and a casting machine 620. The slide rail guide structure 610 is located on one side of the coating assembly 400 and is disposed on the frame 100. The casting machine 620 is slidably disposed on the slide rail guide structure 610 and has a casting head 621 to realize the reciprocating slide rail of the casting machine 620 on the frame 100, thereby realizing the serpentine repetitive casting mode of the casting machine 620, so as to better distribute the modified polyurethane mixture more evenly on the first mica roll, so that the subsequent coating assembly 400 can better coat the modified polyurethane mixture evenly on the first mica roll.

[0090] In this embodiment, the slide rail guide structure 610 includes a slide rail and a sliding groove. The slide rail is mounted horizontally above the conveying assembly 300 and is disposed on the frame 100. The casting machine 620 is formed with a sliding groove. The casting machine 620 is slidably disposed on the guide rail through the sliding groove, thereby realizing the reciprocating slide rail of the casting machine 620 on the frame 100.

[0091] like Figure 4 and Figure 5 As shown, in one embodiment, the coating assembly 400 includes a mounting frame 410 and a doctor blade 420. The mounting frame 410 is disposed on the frame 100, and the doctor blade 420 is disposed on the mounting frame 410 and is positioned toward the conveying channel 310. The doctor blade 420 and the conveying channel 310 form a coating cavity 430 to realize the coating operation of the modified polyurethane mixture.

[0092] like Figure 6As shown, in one embodiment, the continuous coating roller pressing device further includes a V-shaped cleaning component 700, which includes a third fixed roller 710 and a fourth fixed roller 720. The third fixed roller 710 and the fourth fixed roller 720 are respectively located on both sides of the doctor blade 420, and the third fixed roller 710, the doctor blade 420 and the fourth fixed roller 720 form a V-shape.

[0093] It is understandable that, due to the relatively high viscosity of the modified polyurethane mixture, adhesion can easily occur when the mixture passes through the doctor blade 420, affecting subsequent coating processes and resulting in unevenness and roughness, thus impacting the mechanical strength and fire resistance of the battery fireproof separator. Therefore, in this embodiment, a third fixed roller 710 and a fourth fixed roller 720 are added to both sides of the doctor blade 420. These three rollers form a V-shape, allowing the third fixed roller 710 to engage with the release paper roll. One end of the release paper roll passes through the coating cavity 430, and the release paper moves against the doctor blade 420. Finally, the release paper roll is wound up and fixed onto the fourth fixed roller 720. In this way, the added release paper effectively prevents adhesion when the modified polyurethane mixture passes through the doctor blade 420, ensuring the fireproof performance of the battery fireproof separator. The coating produces a uniform and smooth battery fireproof partition semi-finished product B920, which also cleans the doctor blade 420. Simultaneously, when the fourth fixed roller 720 rotates under the action of an external driver, it causes the release paper to wind between the third fixed roller 710 and the fourth fixed roller 720, ensuring the cleanliness of the doctor blade 420 throughout the production process, thus ensuring production continuity and improving production efficiency. Furthermore, the fourth fixed roller 720 can reuse the recycled release paper roll multiple times, thereby increasing the utilization rate of the release paper roll and reducing production costs.

[0094] It should also be noted that the viscosity of the modified polyurethane mixture obtained by mixing components A and B is relatively suitable. This is mainly because the viscosity obtained when the medium-functionality polyether polyol and low-functionality chain extender of component A are mixed with the isocyanate of component B is relatively suitable. This results in a relatively low peel force of the release paper roll, which is not only conducive to continuous and rapid production, but also conducive to the preparation of battery fireproof separators with no stringing and high flatness. If high-functionality polyether polyols are used, the viscosity of the modified polyurethane mixture will increase, resulting in a relatively large peel force of the release paper roll. This will not only affect the speed of continuous production and reduce the efficiency of continuous production, but also make the release paper roll more prone to stringing during peeling, thus affecting the flatness of the battery fireproof separator. At the same time, with the use of the second mica roll and the roll forming assembly 500, it is ensured that a battery fireproof separator with high flatness, light weight, high mechanical strength, high fireproof and heat insulation performance, and good sound insulation effect can be prepared.

[0095] like Figure 8 As shown, in one embodiment, the included angle of the V-shape formed by the third fixed roller 710, the doctor blade 420, and the fourth fixed roller 720 is an obtuse angle. This ensures, on the one hand, that the slope between the release paper and the doctor blade 420 is relatively gentle, which is conducive to the smoother winding of the release paper between the third fixed roller 710 and the fourth fixed roller 720, thereby ensuring that the release paper will not jam during production. On the other hand, it ensures that the projected area of ​​the release paper on the conveying channel 310 is relatively large, which reduces the heat exchange between the modified polyurethane mixture and the outside air, ensuring that the modified polyurethane mixture has good fluidity. This helps the doctor blade 420 to better and more evenly coat the modified polyurethane mixture onto the first mica roll. Furthermore, it helps to better compress the organophosphate, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressant onto the first mica roll, ensuring that a battery fireproof partition with stable structure, lightweight, high fire resistance and flame retardancy, high mechanical strength, and good sound insulation is obtained.

[0096] It is understandable that, since the release paper is relatively smooth, in order to prevent the release paper and the doctor blade 420 from easily moving during contact, in one embodiment, the side of the doctor blade 420 facing the conveying channel 310 is formed with a movable limiting groove. The movable limiting groove is adapted to the release paper and the conveying channel 310 to ensure that the release paper can move within the movable limiting groove, effectively preventing the release paper doctor blade 420 from easily moving during contact, and effectively preventing the doctor blade 420 from contacting the modified polyurethane mixture and causing adhesion.

[0097] like Figure 9As shown, in one embodiment, the scraper 420 has a buffer shrinkage portion 421 and a horizontal portion 422 formed on the side facing the conveying channel 310. The buffer shrinkage portion 421 is disposed adjacent to the casting assembly 600, and the horizontal portion 422 is disposed on the end of the buffer shrinkage portion 421 away from the casting assembly 600. This allows the buffer shrinkage portion 421 and the horizontal portion 422 to form a funnel-shaped coating cavity 430 with the conveying channel 310. In this way, the buffer shrinkage portion 421 can pre-press the modified polyurethane mixture to better ensure that the organophosphate, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres and smoke suppressant can be pressed into the modified polyurethane mixture. In addition to the liquid, it also avoids the situation where many hollow glass microspheres on the surface of the modified polyurethane mixture cannot be well pre-pressed into the modified polyurethane mixture, that is, the hollow glass microspheres cannot be well polymerized in the three-dimensional polymer, resulting in low fire resistance, structural strength and sound insulation effect of the battery fireproof separator. It also allows the release paper to enter the coating cavity 430 more smoothly. The horizontal part 422 can provide better support for the release paper to better ensure that the release paper will not shift in the movable limiting groove. On the other hand, the horizontal part 422 allows the scraper 420 to better coat the modified polyurethane mixture evenly on the first mica roll, thereby ensuring a battery fireproof separator with high flatness.

[0098] like Figure 9 As shown, in one embodiment, the side of the doctor blade 420 facing the conveying channel 310 also forms a buffer widening portion 423, which is connected to the horizontal portion 422. This facilitates the smoother flow of the release paper and the battery fireproof separator semi-finished product A910. In particular, in conjunction with the buffer shrinkage portion 421 and the horizontal portion 422 formed on the doctor blade 420, the release paper can be better wound around the third fixed roller 710 and the fourth fixed roller 720, and the release paper can adhere well to the doctor blade 420. This ensures that the organic phosphate, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres and smoke suppressant can be pressed into the modified polyurethane mixture. Furthermore, it facilitates the smoother flow of the battery fireproof separator semi-finished product A910, enabling continuous production of the continuous coating roller pressing device and greatly improving the production efficiency of the continuous coating roller pressing device.

[0099] like Figure 4 As shown, in one embodiment, the continuous coating roller pressing device further includes a cutting component 1000, which is located on one side of the roller pressing component 500 and is disposed on the frame 100 to perform a cutting operation on the battery fireproof separator in order to prepare a battery fireproof separator that meets the production specifications.

[0100] like Figure 4 As shown, in one embodiment, the rolling assembly 500 includes a first rolling belt 510, a second rolling belt 520, a plurality of first rollers 530, and a plurality of second rollers 540. Each first roller 530 is disposed above the conveying assembly 300 and is spaced apart on the frame 100. The first rolling belt 510 is respectively sleeved on each first roller 530 and is in movable contact with each first roller 530 to realize the rotation of the first rolling belt 510 on each first roller 530. Each second roller 540 is spaced apart on the conveying assembly 300, and the second rolling belt 520 is respectively sleeved on each second roller 540 and is in movable contact with each second roller 540 to realize the rotation of the second rolling belt 520 on each second roller 540, thereby realizing the rolling and fixing of the battery fireproof separator semi-finished product B920.

[0101] like Figure 5 As shown, in one embodiment, the coating assembly 400 further includes two anti-overflow baffles 440, which are located on both sides of the coating chamber 430 and connected to the frame 100, so that the two anti-overflow baffles 440 can effectively prevent the pouring machine 620 from easily overflowing when pouring fireproof material.

[0102] like Figure 5 As shown, in one embodiment, the continuous coating roller pressing device 10 further includes a first correction roller 800, which is disposed adjacent to the first fixed roller 210. The first correction roller 800 is used to correct the offset of the first fixed roller 210 to effectively prevent the first mica roll from shifting during operation.

[0103] Similarly, as Figure 5 As shown, in one embodiment, the continuous coating roller pressing device 10 further includes a second correction roller 900, which is disposed adjacent to the second fixed roller 220. The second correction roller 900 is used to correct the offset of the second fixed roller 220 to effectively prevent the second mica roll from shifting during operation.

[0104] Please see Figure 11This application also provides a battery module, including a housing, multiple battery packs, and multiple battery fireproof partitions as described in any of the above embodiments. A protective compartment is formed inside the housing, and each battery pack is spaced apart in the protective compartment. Each battery fireproof partition is located between a battery pack and the side wall of the protective compartment. That is, by applying the battery fireproof partition of this application to the battery module, isolation is achieved between each battery pack and the side wall of the protective compartment, effectively preventing the surrounding protective compartment and battery pack from igniting when a single battery pack fails, thereby effectively avoiding damage between unit battery packs or even damage to the entire battery compartment and vehicle body.

[0105] To achieve better fire and heat insulation performance for battery modules, in one embodiment, each of the battery fireproof partitions is located between each pair of adjacent battery packs, thereby ensuring that the battery fireproof partitions of this application are provided between each battery pack and between the side wall of the protective compartment and adjacent battery packs. This more effectively prevents the surrounding protective compartment and battery packs from igniting when a single battery pack fails, and more effectively avoids damage between unit battery packs or even damage to the entire battery compartment and vehicle body.

[0106] This application also provides a new energy vehicle, which includes the battery module described in any of the above embodiments. It is understood that the battery module prepared using the battery fireproof separator of this application, when used in a new energy vehicle, effectively prevents the surrounding protective compartment and battery pack from igniting when a single battery pack fails, due to the fireproof separator's lightweight, high fire resistance, high mechanical strength, and good sound insulation properties. This effectively avoids damage between battery cells or even the entire battery compartment and vehicle body, thereby improving the safety of the new energy vehicle's operation.

[0107] Compared with the prior art, the present invention has at least the following advantages:

[0108] 1) The aforementioned battery fireproof separator, when mixed with component A (medium-functionality polyether polyol, low-functionality chain extender) and component B (isocyanate), can rapidly cross-link and solidify on a high-temperature heat-resistant insulating sheet to form a three-dimensional polymer. Simultaneously, this three-dimensional polymer can polymerize organic phosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants, thus producing a battery fireproof separator with high fire resistance, heat insulation, corrosion resistance, and mechanical strength. This not only provides good mechanical protection but also enhances the fire resistance and heat insulation performance of the battery fireproof separator. Specifically, the fireproof separator provides 300 seconds of fire resistance and heat insulation at temperatures above 1300℃. This effectively prevents the flames from spreading when the battery module catches fire, effectively preventing the fault point from igniting surrounding flammable materials, thereby avoiding damage between battery cells or even the entire battery compartment and vehicle body.

[0109] 2) The aforementioned battery fireproof separator uses organic phosphate esters, melamine phosphate, and pentaerythritol as a flame-retardant expansion system. When exposed to fire, it rapidly carbonizes and expands to form a dense carbonized layer. After expansion, the carbonized material has a dense and stable structure with extremely low thermal conductivity, which can effectively prevent the continuous damage of flames and high temperatures to the battery module, thus extending the fireproof and heat insulation time above 1300℃. Furthermore, the flame-retardant expansion system of organic phosphate esters, melamine phosphate, and pentaerythritol does not contain chlorine or bromine, resulting in superior UV resistance and non-yellowing performance of the battery fireproof separator, making it particularly suitable for applications in new energy vehicles.

[0110] 3) The battery fireproof partition described above, since components A and B directly penetrate into the interior of the high-temperature heat-resistant insulating sheet and are cured on the high-temperature heat-resistant insulating sheet to form a modified polyurethane fireproof core board, does not require the use of adhesives between the high-temperature heat-resistant insulating sheet and the modified polyurethane fireproof core board to obtain a battery fireproof partition with high mechanical strength, high fireproof and heat insulation performance and good corrosion resistance.

[0111] 4) The above-mentioned battery fireproof partition, due to the addition of aluminum hydroxide and hollow glass microspheres, not only improves the fireproof and flame-retardant performance of the flame-retardant expansion system, but also improves the mechanical strength of the battery fireproof partition. In addition, the hollow glass microspheres can also reduce weight and provide sound insulation, so as to ensure that the battery fireproof partition is lightweight, has high fireproof and flame-retardant properties, high mechanical strength and good sound insulation effect.

[0112] The following are some specific examples. When %, it refers to a percentage by weight. It should be noted that the following examples do not exhaustively list all possible scenarios, and unless otherwise specified, the materials used in the examples are commercially available.

[0113] Example 1

[0114] Ingredients: Component A: 30 parts polyether polyol (TMN 400 Tianjin Petrochemical Plant No. 3); 1 part catalyst (dibutyltin dilaurate DY12); 1 part organophosphate (xolit OP 1240 Klein Chemical); 10 parts melamine phosphate (MPP) (Melapur 200 BASF); 1 part ethylene glycol (functionality 2); 1 part pentaerythritol; 1 part aluminum hydroxide; 1 part hollow glass microspheres (YN20 Guangzhou Yuanyuan New Materials); 1 part smoke suppressant; Component B: 10 parts polymethylene polyphenyl isocyanate (PM-400 Wanhua Co., Ltd.); 10 parts modified MDI (liquefied MDI, provided by Desmodur CD Bayer);

[0115] Preparation process: Component A and component B are mixed to obtain a modified polyurethane mixture; the modified polyurethane mixture is poured onto the high-temperature heat-resistant insulating sheet, and the battery fireproof partition semi-finished product A is coated to obtain battery fireproof partition semi-finished product B; the battery fireproof partition semi-finished product B is rolled and cured to obtain the battery fireproof partition; finally, the battery fireproof partition is cut to obtain the required specifications; wherein, a continuous coating and rolling device is used for pouring, coating and rolling curing operations, and the pouring speed is 10 kg / min to 12 kg / min or the conveyor belt speed is 2 m / min.

[0116] Example 2

[0117] The difference from Example 1 lies in the composition of the ingredients. Specifically, the ingredients of Example 2 are as follows: Component A: 40 parts of polyether polyol (TMN 400 Tianjin Petrochemical Plant No. 3); 3 parts of catalyst (dibutyltin dilaurate DY12); 5 parts of organophosphate (xolit OP1240 Klein Chemical); 20 parts of melamine phosphate (MPP) (Melapur 200 BASF); 5 parts of ethylene glycol; 5 parts of pentaerythritol; 5 parts of aluminum hydroxide; 5 parts of hollow glass microspheres (YN20 Guangzhou Yuanyuan New Materials); 2 parts of smoke suppressant; Component B: 20 ​​parts of polymethylene polyphenyl polyisocyanate (PM-400 Wanhua Co., Ltd.); 10 parts of modified MDI (liquefied MDI, provided by Desmodur CDBayer). The rest of the preparation process remains unchanged.

[0118] Example 3

[0119] The difference from Example 1 lies in the composition of the ingredients. Specifically, the ingredients of Example 3 are as follows: Component A: 50 parts of polyether polyol (TMN 400 Tianjin Petrochemical Plant No. 3); 5 parts of catalyst (dibutyltin dilaurate DY12); 10 parts of organophosphate (xolit OP1240 Klein Chemical); 25 parts of melamine phosphate (MPP) (Melapur 200 BASF); 10 parts of ethylenediamine; 10 parts of pentaerythritol; 10 parts of aluminum hydroxide; 10 parts of hollow glass microspheres (YN20 Guangzhou Yuanyuan New Materials); 5 parts of smoke suppressant; Component B: 20 ​​parts of polymethylene polyphenyl polyisocyanate (PM-400 Wanhua Co., Ltd.); 20 parts of modified MDI (liquefied MDI) (liquefied MDI, provided by Desmodur CD Bayer). The rest of the preparation process remains unchanged.

[0120] Comparative Example 1

[0121] The difference from Example 1 is that the A component of the ingredients is different. The polyether polyol (TMN 400 Tianjin Petrochemical Plant No. 3) in Example 1 is replaced with a high-functionality polyether polyol (pentaerythritol polyether tetraol TEP-3033) with a function of 4. The rest remains the same.

[0122] Comparative Example 2

[0123] The difference from Example 1 is that the A component of the ingredients is different. The polyether polyol (TMN 400 Tianjin Petrochemical Plant No. 3) in Example 1 is replaced with a polyether polyol with a functionality of 2 (polyether polyol NJ-210), while the rest remain the same.

[0124] Comparative Example 3

[0125] The difference from Example 1 is that hollow glass microspheres were not added to component A of the ingredients, while the rest remained the same.

[0126] Comparative Example 4

[0127] The difference from Example 1 is that aluminum hydroxide was not added to component A of the ingredients, while the rest remained the same.

[0128] Comparative Example 5

[0129] The difference from Example 1 is that ethylene glycol was not added to component A of the ingredients, while the rest remained the same.

[0130] Comparative Example 6

[0131] The difference from Example 1 is that the B component of the ingredients is different. The modified MDI (liquefied MDI) in Example 1 is completely replaced with polymethylene polyphenyl isocyanate, while the rest remains unchanged.

[0132] Comparative Example 7

[0133] The difference from Example 1 is that the B component of the ingredients is different. The polymethylene polyphenyl polyisocyanate of Example 1 is completely replaced with modified MDI (liquefied MDI), while the rest remains the same.

[0134] The battery fireproof separators prepared in Examples 1-3 and Comparative Examples 1-7 were tested for conventional safety performance and fireproof function, and the test results are shown in Table 1.

[0135] Table 1 Test Results

[0136]

[0137] As can be seen from Examples 1-3 in Table 1, Examples 1-3 used a combination of a medium-functionality polyether polyol, a low-functionality (functionality 2) chain extender, polymethylene polyphenyl isocyanate, and modified MDI (liquefied MDI) to crosslink and solidify into a three-dimensional polymer. This allowed for the effective polymerization of organophosphates, melamine phosphate, pentaerythritol, aluminum hydroxide, hollow glass microspheres, and smoke suppressants. Consequently, the conventional safety functions and fire resistance of Examples 1-3 were better than those of Comparative Examples 1-6. (See also...) Figure 3 The experimental diagram of the heat insulation test of the battery fireproof partition shows that the back temperature of Examples 1 to 3 can rise from 1300℃ to 200℃ in a flame for more than 300 seconds, which greatly improves the fireproof performance of the battery fireproof partition. It is especially suitable for application in the battery module of new energy vehicles, and at the same time, it can also play a good role in sound insulation and vibration reduction.

[0138] The embodiments described above are merely illustrative of several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A battery fireproof separator, comprising a high-temperature heat-resistant insulating sheet, characterized in that, The battery fireproof partition also includes a modified polyurethane fireproof core board. The high-temperature heat-resistant insulating sheet is disposed on the outside of the modified polyurethane fireproof core board; The modified polyurethane fireproof core board comprises component A and component B; Component A comprises the following components: 30-50 parts of medium-functionality polyether polyol; 1-5 parts catalyst; 1-10 parts of organophosphates; 10-25 parts of melamine phosphate; 1-10 parts of low-functionality chain extender; Pentaerythritol 1-10 parts; 1-10 parts aluminum hydroxide; 1-10 parts of hollow glass microspheres; 1-5 parts smoke suppressant; Component B comprises the following components: 20-40 parts of isocyanate mixture; The medium-functionality polyether polyol has a functionality of 3 and a hydroxyl value of 300 mg KOH / g to 650 mg KOH / g; the low-functionality chain extender includes at least one of diol, diamine, and ethanolamine. The isocyanate mixture comprises a mixture of polymethylene polyphenyl isocyanate and liquefied MDI.

2. The battery fireproof partition according to claim 1, characterized in that, The high-temperature heat-resistant insulating sheet is mica paper.

3. The battery fireproof partition according to claim 1, characterized in that, The number of high-temperature heat-resistant insulating sheets is two, and the two high-temperature heat-resistant insulating sheets are respectively located on both sides of the modified polyurethane fireproof core board.

4. A method for preparing a fireproof battery separator, characterized in that, The battery fireproof separator according to any one of claims 1-3 is prepared by the battery fireproof separator preparation method described above.

5. The method for preparing a battery fireproof separator according to claim 4, characterized in that, The method for preparing the battery fireproof separator includes the following steps: The A component and the B component are mixed to obtain a modified polyurethane mixture; The modified polyurethane mixture is poured onto the high-temperature heat-resistant insulating sheet to obtain battery fireproof partition semi-finished product A; The battery fireproof partition semi-finished product A is coated to obtain battery fireproof partition semi-finished product B; the battery fireproof partition semi-finished product B is rolled and cured to obtain the battery fireproof partition.

6. The method for preparing a battery fireproof separator according to claim 5, characterized in that, A continuous coating roller press device is used for pouring, coating and roller pressing curing operations.

7. A battery module, characterized in that, The device includes a housing, multiple battery packs, and multiple battery fireproof partitions according to any one of claims 1-3. A protective compartment is formed inside the housing, and each battery pack is spaced apart in the protective compartment. Each battery fireproof partition is located between a battery pack and a side wall of the protective compartment, and / or... Each of the battery fireproof partitions is located between each pair of adjacent battery packs.

8. A new energy vehicle, characterized in that, The new energy vehicle includes the battery module as described in claim 7.

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