Fireproof material for lithium battery module and method of manufacturing the same

Abstract

The present invention discloses a fireproof material for a lithium battery module and a manufacturing method thereof. The fireproof material has a stacked structure formed by stacking a plurality of net structures on each other, and each net structure includes a plurality of first fibers and a plurality of second fibers. The first fibers are oxidized fibers, and the second fibers are silicon salt fibers. The net structure is formed by interlacing the plurality of first fibers and the plurality of second fibers with each other. The plurality of net structures of the fireproof material has a stacked layer number of 5 to 20 layers and a stacked thickness of 0.3 to 5 mm, and the fireproof material has a density of 0.05 to 2 g / cm 3 and a thermal conductivity of 0.01 to 0.8 W / m·K. The fireproof material can have high fire resistance, and at the same time, has the characteristics of light weight, bendability, thin thickness, cushioning, compressibility, non-toxicity, no odor, low thermal conductivity, etc.

Description

TECHNICAL FIELD

[0001] The present application relates to a fireproof material, in particular to a fireproof material for a lithium battery module and a manufacturing method thereof. BACKGROUND

[0002] As shown in Figure 1 The existing fireproof material 100a is mostly formed by adding inorganic powder 1a to polymer resin 2a for application in lithium battery modules. Since the existing fireproof material 100a contains polymer resin 2a, it cannot withstand temperatures higher than 400°C.

[0003] In addition, in order to improve fireproof performance, the existing fireproof material needs to be filled with a large amount of inorganic powder and increase the thickness, resulting in a high specific gravity and weight per unit area, which is not conducive to the market demand for lightweight. At the same time, the existing fireproof material belongs to hard board and cannot be bent, which limits the end application products.

[0004] All the above factors are not conducive to the demand for fire resistance, lightweight, space saving, rapid production and manufacturing of the existing fireproof material, and the assembly requirements of end customers for lithium battery modules of different shapes.

[0005] Therefore, the present application is designed to improve the above-mentioned defects and effectively solve the problems in the prior art. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a fireproof material for a lithium battery module and a manufacturing method thereof to overcome the shortcomings of the prior art.

[0007] To solve the above technical problems, one of the technical solutions adopted by the present application is to provide a fireproof material for a lithium battery module, characterized in that the fireproof material has a stacking structure formed by stacking a plurality of net-like structures on each other, and each of the net-like structures comprises: a first fiber material comprising a plurality of first fibers, and each of the first fibers is an oxidized fiber; and a second fiber material comprising a plurality of second fibers, and each of the second fibers is a silicon salt fiber (such as aluminum silicate fiber).

[0008] Each of the net-like structures is formed by interlacing and weaving a plurality of the first fibers and a plurality of the second fibers with each other; and the plurality of the net-like structures of the fireproof material has a stacking layer number of between 5 and 20, and a stacking thickness of between 0.3 and 5 mm; wherein the fireproof material has a specific gravity of between 0.05 and 2 g / cm 3an overall density between 0.01 to 0.8 W / m K and an overall thermal conductivity between 0.03 to 0.5 W / m K.

[0009] Preferably, each of the first fibers has a first fire resistance of 700 to 1,000 °C and a first thermal conductivity of 0.02 to 0.45 W / m K; wherein each of the second fibers has a second fire resistance of 900 to 1,100 °C and a second thermal conductivity of 0.02 to 0.5 W / m K.

[0010] Preferably, each of the first fibers (oxidized fibers) has a first fiber length of 45 to 120 microns and a first fiber diameter of 1 to 15 microns; wherein each of the second fibers (silicate fibers) has a second fiber length of 50 to 75 microns and a second fiber diameter of 8 to 14 microns.

[0011] Preferably, based on the total weight of the fireproof material being 100 parts by weight, the first fiber material (oxidized fibers) is used in an amount of 30 to 70 parts by weight, and the second fiber material (silicate fibers) is used in an amount of 30 to 70 parts by weight.

[0012] Preferably, the plurality of layers of the mesh structure of the fireproof material has a number of layers between 8 to 16 and a thickness of the stack between 0.5 to 4 millimeters.

[0013] Preferably, the fireproof material has an overall density between 0.1 to 1.2 g / cm 3 an overall density between 0.01 to 0.8 W / m K and an overall thermal conductivity between 0.03 to 0.5 W / m K.

[0014] To solve the above technical problems, another technical scheme adopted by the present application is to provide a manufacturing method of a fireproof material for a lithium battery module, which comprises: an opening cotton step, comprising: opening a plurality of first fibers and a plurality of second fibers by an opening cotton machine; wherein each of the first fibers is an oxidized fiber, and each of the second fibers is a silicate fiber; a mixing cotton step, comprising: mixing the plurality of first fibers and the plurality of second fibers that have been opened with each other by a mixing cotton machine; a carding cotton step, comprising: carding the plurality of first fibers and the plurality of second fibers that have been mixed by a carding cotton machine, so that the length direction of the plurality of first fibers and the length direction of the plurality of second fibers tend to be consistent; a weaving cotton step, comprising: weaving the plurality of first fibers and the plurality of second fibers that have been carded by a weaving cotton machine to form a mesh structure; a needle punching step, comprising: stacking the mesh structure into a stacked structure with a plurality of layers of mesh structure, and performing a needle punching operation on the stacked structure; and a hot pressing step, comprising: performing a hot pressing operation on the stacked structure that has been needle punched by a hot pressing machine to form a fireproof material for a lithium battery module; wherein the plurality of layers of mesh structure of the fireproof material has a stacking number of between 5 and 20 layers and a stacking thickness of between 0.3 and 5 millimeters; wherein the fireproof material has an overall density of between 0.05 and 2 g / cm 3 and an overall thermal conductivity of between 0.01 and 0.8 W / m·K.

[0015] Preferably, in the carding cotton step, the carding cotton machine carding the plurality of first fibers and the plurality of second fibers by a needle roller.

[0016] Preferably, in the carding cotton step, a needle spacing between any two adjacent needles of the plurality of needles provided on the needle roller is between 0.1 microns and 300 microns.

[0017] Preferably, in the needle punching step, a needle punching density of the needle punching operation is between 400 times and 1,800 times per inch.

[0018] Preferably, in the hot pressing step, a hot pressing temperature of the hot pressing operation is between 180°C and 240°C.

[0019] The present application provides a fireproof material for a lithium battery module, which has high fire resistance and other properties such as light weight, flexibility, thin thickness, cushioning, compressibility, non-toxicity, no odor, low thermal conductivity, etc. The fireproof material is suitable for use in lithium battery modules, especially in terminal fields for energy storage and power use. In addition, the fireproof material can be produced in large quantities by roll-to-roll method, thus having the advantage of low production cost.

[0020] For a further understanding of the features and technical contents of the present application, please refer to the following detailed description of the present application and the accompanying drawings, which are provided for reference and illustration only and are not intended to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Schematic diagram of a prior art fireproof material.

[0022] Figure 2 Schematic diagram of a net structure of a fireproof material of an embodiment of the present application.

[0023] Figure 3 Schematic diagram of a net structure of a fireproof material of an embodiment of the present application.

[0024] Figure 4 Schematic diagram of a multi-layer stacking structure of a fireproof material of an embodiment of the present application.

[0025] Figure 5 Flowchart of a manufacturing method of a fireproof material of an embodiment of the present application. DETAILED DESCRIPTION

[0026] The following is a description of the disclosed embodiments of the present application by specific examples. Those skilled in the art can understand the advantages and effects of the present application from the disclosure. The present application can be implemented or applied by other different specific embodiments, and the details in the description can be modified and changed based on different viewpoints and applications without departing from the concept of the present application. In addition, the drawings of the present application are simple schematic illustrations and are not intended to depict actual dimensions. The following embodiments will further illustrate the technical contents of the present application, but the disclosure is not intended to limit the scope of protection of the present application.

[0027] It should be understood that, although the terms "first", "second", "third", etc. can be used herein to describe various materials or parameters, these materials or parameters should not be limited by these terms. These terms are only used to distinguish one material or parameter from another. In addition, the term "or" used herein should be understood to possibly include a combination of one or more of the associated listed items as the case can be.

[0028] [Fireproof material for lithium battery module]

[0029] Referring to FIGS. 1 and 2, embodiments of the present disclosure provide a fireproof material 100 for a lithium battery module. The fireproof material 100 includes a first fiber material 1 and a second fiber material 2. Figure 2 Figure 3 The first fiber material 1 includes a plurality of first fibers, and the second fiber material 2 includes a plurality of second fibers. The plurality of first fibers and the plurality of second fibers are interlaced with each other to form a mesh structure (as shown in FIG. 3).

[0030] The first fiber material 1 includes a plurality of first fibers, and the second fiber material 2 includes a plurality of second fibers. The plurality of first fibers and the plurality of second fibers are interlaced with each other to form a mesh structure (as shown in FIG. 3). Figure 3

[0031] Each of the first fibers is an oxidized fiber, which can be an oxidized polyacrylonitrile fiber (oxidized PAN fiber), but the present disclosure is not limited thereto.

[0032] The first fiber (oxidized fiber) has a first fire resistance of 700°C to 1,000°C (preferably 800°C to 900°C), and a first thermal conductivity of 0.02 W / m·K to 0.45 W / m·K (preferably 0.14 W / m·K to 0.2 W / m·K).

[0033] Further, each of the first fibers (oxidized fibers) has a first fiber length of 45 microns to 120 microns (preferably 45 microns to 60 microns, and more preferably 45 microns to 55 microns).

[0034] In addition, each of the first fibers (oxidized fibers) has a first fiber diameter of 1 micron to 15 microns (preferably 1 micron to 5 microns, and more preferably 1 micron to 3 microns).

[0035] Each of the second fibers is an aluminum silicate fiber.

[0036] ​​The second fiber (silicon salt fiber) has a second refractory degree between 900°C to 1,100°C (preferably 950°C to 1,050°C), and a second thermal conductivity coefficient between 0.02 W / m-K to 0.5 W / m-K (preferably 0.03 W / m-K to 0.4 W / m-K).

[0037] Further, each of the second fibers has a second fiber length between 50 microns to 75 microns (preferably 52 microns to 67 microns). Also, each of the second fibers has a second fiber diameter between 8 microns to 14 microns (preferably 8 microns to 12 microns).

[0038] In terms of amount, based on the total weight of the fireproof material 100 being 100 parts by weight, the amount of the first fiber material 1 (oxidized fiber) is between 30 parts by weight to 70 parts by weight, and preferably between 45 parts by weight to 60 parts by weight, and the amount of the second fiber material 2 (silicon salt fiber) is between 30 parts by weight to 70 parts by weight, and preferably between 35 parts by weight to 45 parts by weight.

[0039] According to the above configuration, the first fiber (oxidized fiber) is used to provide the cloth support strength and basic fireproof characteristics required by the fireproof material 100, and the second fiber (silicon salt fiber) is used to further reinforce the fireproof characteristics of the fireproof material 100.

[0040] In the detailed description of the present application, as shown in Figure 4 The mesh structure formed by the plurality of first fibers and the plurality of second fibers can be further stacked to form a stacked structure having a plurality of layers of the mesh structure. In other words, the fireproof material 100 has a plurality of layers of the mesh structure stacked with each other, and each layer of the mesh structure is formed by the plurality of first fibers and the plurality of second fibers interlaced with each other. The stacked structure can be formed by stacking the same mesh structure in a continuous manner, but the present application is not limited thereto.

[0041] Further, the fireproof material 100 having a plurality of layers of the mesh structure stacked with each other can have a number of stacked layers between 5 layers to 20 layers, and preferably between 8 layers to 16 layers. Further, the fireproof material 100 has a stacked thickness T between 0.3 millimeters (mm) to 5 mm, and preferably between 0.5 mm to 4 mm.

[0042] Overall, the fireproof material 100 formed by the first fiber material 1 and the second fiber material 2 has an overall density between 0.05 g / cm 3 to 2 g / cm 3 , and preferably between 0.1 g / cm 3 to 1.2 g / cm 3The fireproof material 100 has an overall thermal conductivity between 0.01 W / mK and 0.8 W / mK, and preferably between 0.03 W / mK and 0.5 W / mK.

[0043] According to the above configuration, the fireproof material 100 provided by the embodiment of the present application can have high fire resistance, and at the same time, has the characteristics of light weight, thin thickness, bendability, buffering and damping, compressibility, non-toxicity, no odor, low thermal conductivity, etc., so that the fireproof material 100 is suitable for application in lithium battery modules, especially in the terminal field of energy storage and power use.

[0044] In addition, the fireproof material 100 provided by the embodiment of the present application can be quickly and mass-produced in a roll-to-roll manner, so it has the advantage of low production cost.

[0045] It is worth mentioning that the "thermal conductivity" or "K value" mentioned herein refers to the ability of any uniform material to directly conduct heat, or thermal conductivity. If the K value of the material is 1, it means that when the temperature difference between the two surfaces of the material is 1 degree, 1 cubic meter of the material will transfer heat at a rate of 1 watt, that is, the K value is 1 W / mK. The lower the K value, the less the material's ability to transfer heat.

[0046] In addition, the "fire resistance" mentioned herein refers to the temperature at which the material reaches a certain degree of softening or whether it ignites and burns under the action of high temperature, which characterizes the performance of the material resisting high temperature. The determination method of the fire resistance may, for example, be the international standard test method GB / T7322-1997 (ISO 528:1983) "Fire Resistance Test Method for Refractory Materials", but the present application is not limited thereto.

[0047] It is worth mentioning that in a preferred embodiment of the present application, the fireproof material 100 further comprises a third fiber material (not shown in the figure) interlaced and woven with the first fiber material 1 and the second fiber material 2 to form the net structure. The third fiber material comprises a plurality of third fibers, and each of the third fibers is a ceramic fiber.

[0048] Each of the third fibers (ceramic fibers) has a third refractoriness of between 1,000 and 1,200°C (preferably 1,050 and 1,150°C) and a third thermal conductivity of between 0.02 and 0.5 W / m-K (preferably 0.05 and 0.5 W / m-K). Further, each of the third fibers (ceramic fibers) has a third fiber length of between 30 and 60 microns (preferably 45 and 55 microns, and more preferably 45 and 52 microns). Also, each of the third fibers (ceramic fibers) has a third fiber diameter of between 10 and 16 microns (preferably 10 and 14 microns, and more preferably 11 and 13 microns). In terms of amount, based on a total weight of the fireproof material being 100 parts by weight, the amount of the third fibers (ceramic fibers) is between 1 and 20 parts by weight, preferably between 3 and 18 parts by weight, and more preferably between 5 and 10 parts by weight. The third fibers (ceramic fibers) can further provide a reinforcing fireproof effect.

[0049] [Manufacturing method of fireproof material for lithium battery module]

[0050] The above is a material characteristic description of the fireproof material for lithium battery module of the embodiment of the present application. Please refer to Figure 5 The embodiment of the present application further provides a manufacturing method of fireproof material for lithium battery module, which comprises a step S110 (cotton opening step), a step S120 (cotton blending step), a step S130 (cotton carding step), a step S140 (cotton weaving step), a step S150 (needle punching step), and a step S160 (hot pressing step).

[0051] It must be noted that the order of the steps of the embodiment of the present application and the actual operation mode can be adjusted according to the needs, and is not limited to the embodiment. The manufacturing method of the embodiment of the present application can provide additional operations before, during, or after each step, and some of the described operations can be replaced, eliminated, or rearranged to achieve additional embodiments.

[0052] The step S110 is to implement a cotton opening step, which comprises opening the plurality of first fibers (oxidized fibers) of the first fiber material 1 and the plurality of second fibers (silicate fibers) of the second fiber material 2 by a cotton opening machine, so that the plurality of first fibers and second fibers are in a uniformly dispersed and fluffy state.

[0053] The step S120 is to implement a cotton blending step, which comprises mixing the plurality of first fibers (oxidized fibers) and the plurality of second fibers (silicate fibers) that have been opened with each other by a cotton blending machine.

[0054] The step S130 is to perform a cotton carding step, which includes carding the mixed plurality of first fibers (oxidized fibers) and the plurality of second fibers (silicate fibers) by a cotton carding machine, so that the length directions of the plurality of first fibers and the plurality of second fibers tend to be consistent (as shown in FIG. 1). Figure 3

[0055] It is worth mentioning that, in a preferred embodiment of the present application, the cotton carding machine in the step S130 carding the plurality of first fibers (oxidized fibers) and the plurality of second fibers (silicate fibers) by a card clothing roll of the cotton carding machine.

[0056] Any two adjacent needles of the plurality of needles provided on the card clothing roll have a needle spacing therebetween, which is between 0.1 microns and 300 microns, preferably between 10 microns and 30 microns, and more preferably between 15 microns and 22 microns.

[0057] The step S140 is to perform a cotton weaving step, which includes weaving the plurality of first fibers (oxidized fibers) and the plurality of second fibers (silicate fibers) carded by a cotton weaving machine to form a continuous mesh structure. In an embodiment of the present application, the cotton weaving machine can be, for example, an air jet loom, but the present application is not limited thereto.

[0058] It is worth mentioning that, since the needle spacing between any two adjacent needles of the plurality of needles provided on the card clothing roll is specially adjusted in the step S130, the plurality of first fibers (oxidized fibers) and the plurality of second fibers (silicate fibers) carded by the cotton carding machine can be more easily formed into the continuous mesh structure by the cotton weaving machine (e.g., an air jet loom), and the fibers will not fall between the rollers in the cotton weaving machine, but the present application is not limited thereto.

[0059] If the needle spacing exceeds the above range, the plurality of fibers can not be easily formed into the continuous mesh structure, or the plurality of fibers can be more easily dropped between the rollers in the cotton weaving machine.

[0060] The step S150 is to perform a needle punching step, which includes stacking the continuous mesh structure formed by the step S140 into a stacked structure having a number of layers between 5 and 20 (preferably between 8 and 16). ​

[0061] The needling step further comprises: performing a needling operation on the stacked structure. Wherein, the needling density of the needling operation is preferably 400 to 1,800 times per inch, and preferably between 400 to 600 times, so that the stacked structure can have an ideal overall density (such as: 0.05 to 2 g / cm 3 ), a stacked thickness (such as: 0.3 to 5 mm), and a thermal conductivity (such as: 0.01 to 0.8 W / m·K).

[0062] The step S160 is to perform a hot pressing step, which comprises performing a hot pressing operation on the needled stacked structure by a heat pressing machine to form the fireproof material 100 for lithium battery modules.

[0063] Wherein, the hot pressing temperature of the hot pressing operation is between 180°C to 240°C.

[0064] According to the above configuration, the fireproof material 100 provided by the embodiments of the present application can have high fire resistance characteristics, and at the same time have the characteristics of light weight, thin thickness, bendability, cushioning and damping, compressibility, non-toxicity, no odor, low thermal conductivity, etc. to make the fireproof material 100 suitable for application in lithium battery modules, especially in the terminal field of energy storage and power use.

[0065] Preferably, the above manufacturing method can also operate on the third fiber (ceramic fiber) at the same time.

[0066] [Experimental data and test results]

[0067] In order to verify the technical effects of the fireproof material for lithium battery modules and the manufacturing method thereof of the present application, the following will be illustrated by experimental data and experimental results. However, the following examples and comparative examples are only for the convenience of understanding the present application, and the protection scope of the present application is not limited thereto.

[0068] Example 1: According to the process parameters listed in Table 1, a plurality of oxidized fibers, a plurality of silicon salt fibers, and a plurality of ceramic fibers are opened by an opener; the plurality of fibers opened are mixed with each other by a mixer; the plurality of fibers mixed are carded by a carding machine to make the length direction of the fibers consistent; wherein the distance between any two adjacent needles on the carding roller is shown in Table 1; the plurality of fibers carded are woven by a weaving machine to form a continuous net structure; the continuous net structure is stacked into a stacked structure and a needle punching operation is performed on the stacked structure, wherein the needle punching density of the needle punching operation is shown in Table 1; and finally, a hot pressing operation is performed on the needle punched stacked structure by a hot press to form a fireproof material for a lithium battery module.

[0069] The preparation methods of Examples 2 to 4 and Comparative Examples 1 to 3 are the same as Example 1, except that the process conditions are as follows in Table 1. Comparative Example 4 uses a commercially available PU foaming thermal insulation material. Comparative Example 5 uses a commercially available aerogel fireproof material.

[0070] Then, the fireproof materials prepared in the above examples and comparative examples are tested for properties such as thickness, density, thermal conductivity (k value), fiber state, fire resistance of the fireproof material, and introduction into a lithium battery module evaluation. The related test results are shown in Table 1.

[0071] In terms of test methods, the thickness is tested in a general conventional manner, which is not described here. The density test method is to take a 100 square decimeter (tolerance ± 2 mm) sample and weigh it, with a weight of X g. Calculate the square meter weight (g / m 2 ) = 100 × X g, the density (g / cm 3 ) = square meter weight g / m 2 / thickness mm / 1000. The definitions or test methods of thermal conductivity and fire resistance of the fireproof material have been described above and are not described here.

[0072] The test method of the fiber state is to use a stereomicroscope (dissecting microscope) to observe the fireproof material sample at 50 times magnification to confirm whether there is a fracture. The introduction into a lithium battery module evaluation is to introduce the fireproof material into a lithium battery module to evaluate whether the lithium battery module can operate normally. If it can operate normally, it is evaluated as Pass, and if it cannot operate normally, it is evaluated as NG.

[0073] [Table 1]

[0074]

[0075]

[0076] [Results and Discussion]

[0077] According to the above experimental results, the fiber state of the fireproof material of Examples 1 to 4 did not have a fracture. The fireproof material had a fire resistance that did not burn. The evaluation of the lithium battery module was passed.

[0078] The needling density per inch of Comparative Example 1 was 200, which was lower than the ideal 400, so the thermal conductivity of the finally formed fireproof material was lower than that of Examples 1 to 4, and the evaluation of the lithium battery module was NG. Comparative Example 2 had too high an amount of oxidized fiber (85 g) and too low an amount of silicon salt fiber (5 g), so the fire resistance test of the fireproof material burned, and the evaluation of the lithium battery module was NG. Comparative Example 3 had too low an amount of oxidized fiber (5 g) and too high an amount of silicon salt fiber (85 g), so the fiber state had a fracture, and the evaluation of the lithium battery module was NG. Comparative Examples 4 and 5 used commercially available materials, which severely burned in the fire resistance test.

[0079] [Advantages of the embodiments]

[0080] The fireproof material for a lithium battery module according to the present application has high fire resistance and at the same time has the characteristics of light weight, thin thickness, bendability, cushioning, compressibility, non-toxicity, no odor, low thermal conductivity, etc. Therefore, the fireproof material is suitable for use in a lithium battery module, especially in the terminal field for energy storage and power use. In addition, the fireproof material can be mass-produced in a roll-to-roll manner, so it has the advantage of low production cost.

[0081] The above disclosure is only a preferred embodiment of the present application, and does not limit the scope of the patent application of the present application. Any equivalent technical changes made according to the content of the present application and the drawings are included in the scope of the patent application of the present application.

Claims

1. A fireproofing material for a lithium battery module, characterized by, The fireproof material has a stacking structure formed by stacking a plurality of net structures on each other, and each of the net structures comprises: a first fiber material comprising a plurality of first fibers, and each of the first fibers is an oxidized fiber; and a second fiber material comprising a plurality of second fibers, and each of the second fibers is a silicon salt fiber; wherein each of the net structures is formed by interlacing weaving the plurality of first fibers and the plurality of second fibers with each other; and the plurality of net structures of the fireproof material has a stacking layer number of 5 to 20 layers and a stacking thickness of 0.3 to 5 mm; based on the total weight of the fireproof material being 100 parts by weight, the amount of the first fiber material is 45 to 60 parts by weight, and the amount of the second fiber material is 35 to 45 parts by weight; wherein said fireproof material has an overall density comprised between 0.175 and 0.25 g / cm 3 and an overall thermal conductivity comprised between 0.01 and 0.8 W / m.K.

2. The fireproof material for a lithium battery module according to claim 1, characterized by, each of the first fibers has a first fire resistance of 700 to 1,000 degrees Celsius and a first thermal conductivity coefficient of 0.02 to 0.45 W / m·K; wherein each of the second fibers has a second fire resistance of 900 to 1,100 degrees Celsius and a second thermal conductivity coefficient of 0.02 to 0.5 W / m·K.

3. The fireproof material for a lithium battery module according to claim 2, characterized by, each of the first fibers has a first fiber length of 45 to 120 microns and a first fiber diameter of 1 to 15 microns; wherein each of the second fibers has a second fiber length of 50 to 75 microns and a second fiber diameter of 8 to 14 microns.

4. The fireproof material for a lithium battery module according to any one of claims 1 to 3, characterized by, The plurality of net structures of the fireproof material has a stacking layer number of 8 to 16 layers and a stacking thickness of 0.5 to 4 mm; wherein the fireproof material has an overall thermal conductivity coefficient of 0.03 to 0.5 W / m·K.

5. A method for manufacturing a fireproof material for a lithium battery module, characterized by, The manufacturing method of the fireproof material comprises: an opening step, comprising: opening a plurality of first fibers and a plurality of second fibers by an opening machine; wherein each of the first fibers is an oxidized fiber, and each of the second fibers is a silicon salt fiber; a blending step, comprising: blending the plurality of first fibers and the plurality of second fibers that have been opened with each other by a blending machine; a carding step, comprising: carding the plurality of first fibers and the plurality of second fibers that have been blended by a carding machine, so that the length direction of the plurality of first fibers and the length direction of the plurality of second fibers tend to be consistent; a weaving step, comprising: weaving the plurality of first fibers and the plurality of second fibers that have been carded by a weaving machine to form a net structure; a needle punching step, comprising: stacking the net structure into a stacking structure having a plurality of net structures, and performing a needle punching operation on the stacking structure; wherein the needle punching density of the needle punching operation is 400 to 600 needle punches per inch; and a hot pressing step, comprising: performing a hot pressing operation on the stacking structure that has been needle punched by a hot pressing machine to form a fireproof material for a lithium battery module; The plurality of layers of the reticular structure of the fireproof material has a number of layers between 5 and 20 and a thickness between 0.3 and 5 mm; The amount of the first fiber material is 45 to 60 parts by weight and the amount of the second fiber material is 35 to 45 parts by weight based on 100 parts by weight of the total weight of the fireproof material; wherein said fireproof material has an overall density comprised between 0.175 and 0.25 g / cm 3 and an overall thermal conductivity comprised between 0.01 and 0.8 W / m.K.

6. The method of manufacturing a fireproof material for a lithium battery module according to claim 5, wherein In the carding step, the carding machine cards the plurality of first fibers and the plurality of second fibers by a carding roller.

7. The method of manufacturing a fireproof material for a lithium battery module according to claim 6, wherein In the carding step, a carding distance between any two adjacent carding needles of the plurality of carding needles disposed on the carding roller is between 0.1 and 300 microns.

8. The method of manufacturing a fireproof material for a lithium battery module according to claim 5, wherein In the hot pressing step, a hot pressing temperature of the hot pressing operation is between 180 and 240 degrees Celsius.

Images