Mineral-based fire extinguishing agents for batteries

Abstract

The present invention relates to an inorganic-based fire extinguishing agent for batteries, comprising an inorganic curing agent, a thickening agent, and a curing catalyst, wherein the thickening agent and the curing catalyst are composed of 0.1 to 1 part by weight and 0.1 to 1 part by weight, respectively, with respect to 1 part by weight of the inorganic curing agent, and is characterized by forming a ceramic film of at least 0.5 mm in the event of a fire to suppress the spread of fire and combustion. The inorganic-based fire extinguishing agent for batteries according to the present invention comprises an inorganic curing agent, a thickening agent, and a curing catalyst, and by forming an air-blocking insulator ceramic film during a battery fire, it shortens the fire suppression time and prevents secondary fire spread through electrical insulation, and suppresses combustion spread, thereby having an excellent effect of lowering the risk of re-ignition.

Description

Technology Field

[0001] The present invention relates to an inorganic-based fire extinguishing agent for batteries. Background Technology

[0002] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium batteries. Among these, lithium batteries are widely used as battery modules for electric vehicles, electric bicycles, and electric scooters due to their characteristics of being able to charge and discharge freely with almost no memory effect compared to nickel-based batteries, as well as their very low self-discharge rate and high energy density.

[0003] These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. Positive and negative plates coated with these materials are arranged with a separator in between to form an electrode assembly, and this electrode assembly is sealed and housed within an outer casing along with an electrolyte.

[0004] Lithium-ion batteries are widely used not only in small devices such as portable electronic devices but also in medium-to-large devices such as automobiles and power storage systems. When used in such medium-to-large devices, a large number of secondary batteries are electrically connected to form a battery module in order to increase capacity and output.

[0005] These battery modules are equipped with a large number of secondary batteries, and they have high combustion energy and thermal runaway characteristics. When each secondary battery ignites or explodes, heat or flames are transferred to adjacent secondary batteries, which causes secondary explosions and thus increases the effort required to prevent secondary ignition or explosion. Additionally, there is a problem that it is extremely difficult to extinguish a fire in a battery module using the extinguishing powder of a standard powder fire extinguisher.

[0006] Therefore, there is an urgent need to develop new fire extinguishing agents capable of extinguishing electrical fires, such as those involving lithium-ion battery modules, at an early stage, and such agents are currently being developed in various ways.

[0007] Conventionally, wet chemical agents were generally used as fire extinguishing agents for batteries. Wet chemical agents primarily consist of extinguishing agents that lower the freezing point by adding salts with fire-inhibiting effects (alkali metal salts such as sodium bicarbonate, potassium carbonate, potassium acetate, ammonium phosphate, and other compositions) to enhance the extinguishing power of water, and reduce surface tension by adding a small amount of surfactant.

[0008] However, conventional fire extinguishing agents have limitations in reaching the ignition point inside the battery cell and suppressing the spread of combustion, so a new approach is needed to suppress combustion spread.

[0009] Accordingly, the inventors have developed an inorganic-based fire extinguishing agent for batteries that suppresses battery fires and effectively inhibits the spread of combustion by mixing an inorganic curing agent, a thickening agent, and a crosslinking agent with excellent heat resistance and heat dissipation properties, and coating the exterior of the battery pack with ceramic through phase transformation, thereby completing the present invention. Prior art literature

[0010] Republic of Korea Registered Patent No. 10-2664166 The problem to be solved

[0011] The present invention has as its technical problem to provide an inorganic-based fire extinguishing agent for batteries. means of solving the problem

[0012] In order to achieve the above technical challenge,

[0013] A fire extinguishing agent comprising an inorganic hardening agent, a thickening agent, and a hardening catalyst,

[0014] It consists of 0.1 to 1 weight part of the thickening agent and 0.1 to 1 weight part of the curing catalyst per 1 weight part of the inorganic curing agent, and

[0015] The present invention provides an inorganic-based fire extinguishing agent for batteries characterized by forming a ceramic film of at least 0.5 mm in the event of a fire to suppress the spread of fire and combustion. Effects of the invention

[0016] The inorganic-based fire extinguishing agent for batteries according to the present invention comprises an inorganic curing agent, a thickening agent, and a curing catalyst, and by forming an air-blocking insulator ceramic film during a battery fire, it shortens the fire suppression time and prevents secondary fire spread through electrical insulation, and suppresses combustion spread, thereby having an excellent effect of lowering the risk of re-ignition. Brief explanation of the drawing

[0017] Figure 1 is a photograph showing the result of coating a fire extinguishing agent slurry according to one embodiment of the present invention onto a hydrophilic substrate (glass). Figure 2 is a photograph showing the result of coating a fire extinguishing agent slurry according to one embodiment of the present invention onto a hydrophobic substrate (styrofoam). Figures 3 and 4 are the results of testing the viscosity of a fire extinguishing agent slurry according to a mixing ratio in one embodiment of the present invention. Figure 5 is a graph showing the viscosity for each mixing ratio on a scale. Figure 6 is a photograph showing the morphological characteristics before and after heat treatment when a fire extinguishing agent slurry according to one embodiment of the present invention is applied to a hydrophobic substrate. Figure 7 is a photograph showing whether warping occurs before and after heat treatment when a fire extinguishing agent slurry according to one embodiment of the present invention is applied to a large-area hydrophobic substrate. Figure 8 is a graph showing the results of X-ray structural analysis according to the amounts of thickener and crosslinking agent in the fire extinguishing agent slurry of the present invention. Specific details for implementing the invention

[0018] The present invention is susceptible to various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals have been used for similar components in the description of each drawing.

[0019] Throughout this specification and claims, unless otherwise stated, the term "comprise," "comprises," or "comprising" is intended to indicate the presence of the features, numbers, steps, reactions, components, or combinations thereof described in the specification, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, reactions, components, or combinations thereof.

[0020] The terms used in this invention are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0021] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0023] According to one aspect of the present invention, there is provided an inorganic-based fire extinguishing agent for batteries comprising an inorganic curing agent, a thickening agent, and a curing catalyst, wherein the thickening agent is composed of 0.1 to 1 weight part and the curing catalyst is composed of 0.1 to 1 weight part with respect to 1 weight part of the inorganic curing agent, and at least 0.5 mm of a ceramic film is formed to suppress the spread of fire and combustion when a fire occurs.

[0024] Conventional liquid fire extinguishing agents suppress fires by utilizing the cooling effect of water, the suffocating effect caused by water vapor and carbon dioxide generated during decomposition, and the inhibition of chain reactions by potassium ions. In contrast, the fire extinguishing agent of the present invention is technically characterized by suppressing the spread of fire by forming a ceramic film through a phase change during a fire by mixing an inorganic hardener, a thickener, and a hardening catalyst.

[0025] To this end, the present invention comprises an inorganic curing agent and a thickening agent to form an air-blocking insulator ceramic film that suppresses combustion spread during a fire, and improves the curing speed and thermal stability by mixing each component in an optimal ratio.

[0026] In the present invention, the inorganic hardening agent may be one or more selected from the group consisting of Portland cement, gypsum, alumina cement, polyphosphoates, sodium silicate, potassium silicate, lithium silicate, sodium carbonates, potassium carbonates, lithium carbonates, sodium hydroxide, potassium hydroxide, lithium hydroxide, and silicofluoride.

[0027] Preferably, sodium silicate (Na2SiO3), which is water glass, can be used. Sodium silicate is a compound formed by the combination of silicon and sodium, and it can form a viscous liquid when dissolved in water. Due to this property, it can be used for various purposes such as adhesives, waterproofing agents, and preservatives. In the present invention, the water glass not only forms a ceramic film as an inorganic curing agent, but also can become a liquid when dissolved in water, thereby facilitating the extinguishing process.

[0028] The present invention provides a fire extinguishing agent having a fast curing speed and excellent thermal stability by further including a thickening agent and a crosslinking agent in the inorganic curing agent.

[0029] In the present invention, the thickening agent may be one or more selected from the group consisting of kaolin, diatomite, kaolin, calcium carbonate, magnesium silicate, and montmorillonite.

[0030] Preferably, kaolin can be used to control the viscosity of the fire extinguishing agent and to maintain its shape during phase change. Furthermore, calcium carbonate can also act as a thickening agent and can be combined with the kaolin to enhance the shape-maintaining function.

[0031] When used with inorganic curing agents, particularly water glass, the thickener of the present invention possesses non-flammability that suppresses flames by generating water during combustion, and heat resistance that maintains stable performance at high temperatures, thereby enabling it to form a network during the process in which the fire extinguishing agent of the present invention forms a ceramic film. In other words, it also provides a function as a crosslinking agent.

[0032] In the present invention, the curing catalyst may be one or more selected from the group consisting of hydroxides, phosphates, carbonates, sulfates, and silica. More preferably, two or more curing catalysts selected from the group consisting of hydroxides, phosphates, carbonates, sulfates, and silica may be used. It is desirable to use two or more curing catalysts so that the ceramic film is maintained without volume change or warping.

[0033] Hydroxides may include aluminum hydroxide, magnesium hydroxide, and layered double hydroxide (LDH); phosphates may include ammonium polyphosphate, aluminum phosphate, zinc phosphate, tricalcium phosphate, etc.; carbonates may include calcium carbonate, magnesium carbonate, etc.; and sulfates may include calcium sulfate, barium sulfate, etc., but are not limited thereto.

[0034] For example, to increase the curing speed, the present invention utilizes aluminum hydroxide as a curing catalyst to rapidly form a ceramic film by increasing the curing speed compared to conventional methods. Additionally, by using aluminum phosphate in combination, it maintains stable performance at high temperatures, exhibits minimal deformation due to thermal expansion, and features increased ceramic strength, thereby providing stable ceramic film formation along with rapid curing.

[0035] As such, metal hydroxide catalysts not only have excellent flame resistance but also have a higher melting point after oxidation, allowing them to function stably even in high-temperature environments. Furthermore, they possess electrical insulation properties, which can prevent the spread of secondary fires. Moreover, by stably forming a ceramic film, they can enhance the oxygen blocking effect, thereby reducing the risk of re-ignition after fire extinguishing.

[0036] The fire extinguishing agent of the present invention, comprising an inorganic curing agent, a thickening agent, and a curing catalyst, forms a gel as water is removed during the drying process when the mixed solution is exposed to heat due to a fire. At this time, the mechanism by which the fire extinguishing agent forms a ceramic film through phase change proceeds by including chemical reaction, dehydration, condensation, and crystallization steps.

[0037] For example, when a fire extinguishing agent is prepared by mixing kaolinite and aluminum hydroxide with sodium silicate, during the gel formation process, moisture is removed along with the silicate and metal ions (Al) within the water glass. 3+ , Na + The layers are gradually rearranged to form a gel structure. Additionally, aluminum phosphate may be included, which can contribute to promoting chemical bonding with the silicate network and stabilizing the chemical reaction between kaolin and aluminum hydroxide. During this process, the layered structure of kaolin and aluminum hydroxide interact with the gel network to form an initial amorphous structure.

[0038] Subsequently, exposure to heat and subsequent heat treatment lead to solidification and ceramic formation. This process involves dehydration, condensation, and crystallization reactions.

[0039] For example, when kaolin, aluminum hydroxide, and aluminum phosphate are mixed with water glass, as heat treatment begins, the aluminum hydroxide undergoes a dehydration reaction and is converted into alumina, while the kaolin is converted into metakaolin depending on the heat treatment temperature and the hydroxide is removed.

[0040] Subsequently, during the condensation reaction, the silicate network of water glass polymerizes at high temperatures to form Si-O-Si bonds, while simultaneously the Si-O-Al bonds of kaolin are strengthened, forming a solid ceramic network. Additionally, aluminum phosphate forms an Al-OP network during heat treatment. This network combines with the silicate network to form a high-strength aluminophosphate-silicate composite structure.

[0041] Finally, as the heat treatment temperature increases, the crystallization reaction gradually transforms the amorphous structure into a crystalline structure. During this process, alumina and silica form strong chemical bonds, creating a robust ceramic coating film. Additionally, as the heat treatment temperature increases, aluminum phosphate crystallizes and stabilizes in the form of aluminum phosphate ceramic. In this process, the interaction between SiO2 and Al2O3 is strengthened, and AlPO4 acts as a bonding enhancer within the crystalline matrix.

[0042] Through this mechanism, the fire extinguishing agent of the present invention is sprayed or applied in liquid form and hardens to form a ceramic film, thereby promoting suffocation extinguishing. To this end, it is desirable to control the viscosity of the fire extinguishing agent so that it can be easily applied to the outside of the battery in the event of a fire. Therefore, it is desirable to control the viscosity of the fire extinguishing agent so that it is neither too low nor too high, and to control the content of each component to control the hardening speed.

[0043] Since the composition of the ceramic membrane of the fire extinguishing agent of the present invention is determined by the type and ratio of the inorganic curing agent, thickener, and curing catalyst used, it is necessary to provide each component by controlling it to an appropriate mixing ratio. Accordingly, the present invention is characterized by controlling the composition so that 0.1 to 1 weight part of the thickener and 0.1 to 0.1 weight part of the curing catalyst are used for every 1 weight part of the inorganic curing agent.

[0044] It is preferable to control the viscosity of the fire extinguishing agent by including the thickener of the present invention in an amount of 0.1 to 1 part by weight per 1 part by weight of the inorganic curing agent. If the thickener is included in an amount less than 0.1 part by weight, the viscosity is low and the coating properties are poor, and if the thickener exceeds 1 part by weight, the film formation and shape retention functions are poor and are undesirable. Preferably, it is included in an amount of 0.1 to 0.5 parts by weight, and more preferably, in an amount of 0.1 to 0.375 parts by weight.

[0045] It is preferable to include the curing catalyst of the present invention in an amount of 0.1 to 1 weight part to control the rate of ceramic film formation according to the phase change of the fire extinguishing agent. If the curing catalyst is included in an amount less than 0.1 weight part, the curing speed slows down, which reduces the fire spread inhibition effect, and if the curing catalyst exceeds 1 weight part, it is undesirable as it may cause volume changes in the ceramic film or cracks to occur. More preferably, the crosslinking agent may be included in an amount of 0.15 to 0.55 weight part per 1 weight part of the inorganic curing agent.

[0046] When the fire extinguishing agent of the present invention is exposed to heat during a fire, it forms a ceramic film with a thickness of at least 0.5 mm to suppress the spread of fire and combustion. Preferably, it forms a ceramic film of 0.6 to 1.1 mm to effectively suppress the spread of fire.

[0047] As such, the fire extinguishing agent of the present invention is technically characterized by using an inorganic-based curing agent with excellent heat resistance and heat dissipation properties, and simultaneously suppressing battery fire and combustion spread by coating the exterior of the battery with ceramic through phase change.

[0049] The embodiments of the present invention will be described in more detail below. However, the following embodiments are provided merely to aid in understanding the present invention and do not limit the scope of the present invention.

[0051] <Example>

[0052] manufacturing of fire extinguishing agents (slurry)

[0053] A fire extinguishing agent slurry was prepared by mixing an inorganic curing agent and an additive based on water glass in the weight ratios shown in Table 1 below.

[0054] water glass kaoline CaCO3 Al(OH)3 AlPO4 Example 1 1 Example 2 1 0.1 Example 3 1 0.25 Example 4 1 0.5 Example 5 1 0.75 Example 6 1 0.1 Example 7 1 0.25 Example 8 1 0.5 Example 9 1 0.75 Example 10 1 0.1 Example 11 1 0.25 Example 12 1 0.5 Example 13 1 0.75 Example 14 1 0.1 Example 15 1 0.25 Example 16 1 0.5 Example 17 1 0.75 Example 18 1 0.35 0.3 Example 19 1 0.35 0.3 Example 20 1 0.35 0.3 Example 21 1 0.35 0.15 0.15 Example 22 1 0.35 0.15 0.15 Example 23 1 0.1 5.5 Example 24 1 0.1 0.55 Example 25 1 0.1 0.55 Example 26 1 0.1 0.275 0.275 Example 27 1 0.1 2.75 0.275 Example 28 1 0.1 0.1375 0.1375 0.275 Example 29 1 0.1 0.1375 0.275 0.1375 Example 30 1 0.35 0.3 Example 31 1 0.35 0.3 Example 32 1 0.35 0.15 0.15

[0056] Viscosity test

[0057] The flow rate of each slurry was expressed on a viscosity scale of 1 to 10, with the reference value based on the flow rate of water glass. 2 mL of the fire extinguishing agent slurry according to each example was dropped onto a styrofoam surface, held upright at a 90-degree angle for 30 seconds, and the distance flowed was measured and expressed as a viscosity value. The viscosity value of a slurry that flowed down significantly, like water glass, was expressed as being close to 1, while the viscosity value of a slurry with no flow was expressed as being close to 10.

[0059] <Evaluation and Results>

[0060] Confirmation of coating feasibility based on substrate type

[0061] Figure 1 is a photograph showing the result of coating a fire extinguishing agent slurry according to one embodiment of the present invention onto a hydrophilic substrate (glass). Figure 2 is also a photograph showing the result of coating a fire extinguishing agent slurry according to one embodiment of the present invention onto a hydrophobic substrate (styrofoam).

[0062] Referring to Figures 1 and 2, all embodiments showed good coating on glass, a hydrophilic substrate, whereas coating was relatively poor on styrofoam, a hydrophobic substrate. Accordingly, it was confirmed that it is necessary to control viscosity and adjust coating properties by adjusting the content of the constituent components.

[0064] Slurry viscosity

[0065] Figures 3 and 4 are the results of testing the viscosity of a fire extinguishing agent slurry according to a mixing ratio in accordance with an embodiment of the present invention. In addition, Figure 5 is a graph showing the viscosity for each mixing ratio on a scale.

[0066] Referring to Figures 3 and 5, it was confirmed that the additives determining the viscosity of the slurry are Kaolin and CaCO3. Meanwhile, Al(OH)3 was found to have the least effect on viscosity, and AlPO4 showed a tendency to cure the slurry quickly. It was observed that as the amount of AlPO4 increased, the curing speed accelerated and the viscosity also increased.

[0067] In addition, referring to Figure 4, it was confirmed that CaCO3 has a greater influence on the change in viscosity of the slurry than Al(OH)3 and AlPO4, and that AlPO4 has a greater influence on the change in viscosity of the slurry than Al(OH)3.

[0068] Since coating is possible even on hydrophobic substrates by controlling viscosity, experiments were conducted by combining a thickening agent and a crosslinking agent and controlling the content of each component.

[0070] Film thickness measurement before and after heat treatment

[0071] In order to verify the phase change and results due to fire occurrence for Examples 18 to 32 based on the above slurry viscosity change, heat treatment was performed at 950°C for 4 hours.

[0072] Figure 6 is a photograph showing the morphological characteristics before and after heat treatment when a fire extinguishing agent slurry according to one embodiment of the present invention is applied to a hydrophobic substrate. In addition, the average thickness (mm) (measured 4 times) and morphological characteristics of the film after heat treatment are shown in Table 2 below.

[0073] Example 18 Example 19 Example 20 Example 21 Example 22 Average thickness of heat-treated films 1.623 0.803 0.921 0.797 0.876 morphological change Shrinkage occurs Signs of shrinkage crack occurred shape retention shape retention Example 23 Example 24 Example 25 Example 26 Example 27 Average thickness of heat-treated films 1.099 1.231 0.953 0.646 0.816 morphological change Shrinkage occurs Signs of shrinkage Signs of a crack shape retention shape retention Example 28 Example 29 Example 30 Example 31 Example 32 Average thickness of heat-treated films 1.133 0.745 0.671 1.014 1.019 morphological change Signs of shrinkage Shrinkage occurs Shrinkage occurs shape retention shape retention

[0074] Referring to Figure 6 and Table 2, in the case of Examples 21, 22, 26, 27, 31, and 32, the shape of the ceramic film was stably formed and maintained. However, in the case of Examples 22, 27, and 31, warping occurred when the area was scaled up to a large size as shown in Figure 7. On the other hand, in the case of Examples 21, 26, and 32, which simultaneously contained AlPO4 and Al(OH)3 as catalytic curing agents, it was confirmed that the shape was maintained without cracking or shrinkage. In particular, in this case, it was confirmed that AlPO4 and Al(OH)3 were included in a weight ratio of 1:1.

[0075] In the case of Examples 19 and 24, which did not include a curing catalyst and included only a thickening agent, signs of shrinkage appeared. Meanwhile, in the case of Examples 20 and 25, which used kaolin as a thickening agent and only AlPO4 as a curing catalyst, cracks occurred or signs of cracking appeared. In addition, in the case of Examples 18, 23, and 30, which used only Al(OH)3 as a curing catalyst, shrinkage occurred in which the volume of the ceramic film changed and its shape collapsed.

[0076] When looking at the results according to the specific content of each component, a porous form appeared due to CO2 generation when the calcium carbonate content was 3 parts by weight or more. However, in the case of Examples 31 and 32, in which 0.15 parts by weight or more of AlPO4 was used as a curing catalyst, it was confirmed that the form was maintained as the curing speed increased with AlPO4.

[0078] Meanwhile, Figure 8 is a graph showing the results of X-ray structural analysis according to the amounts of kaolin, Al(OH)3, and CaCO3 in the fire extinguishing agent slurry of the present invention. The optimal amounts of kaolin, Al(OH)3, and CaCO3 added per 10 g of water glass were determined.

[0079] Referring to Figure 8a to verify the optimal amount of kaolin added, it can be confirmed that a network of water glass and kaolin was formed through the peak around 22 degrees. Additionally, when the amount of kaolin added was reduced from 7g to 5g, the intensity of the peak around 24 degrees also decreased. (a) is the result of heating kaolin powder at 950°C, (b) is the result of heating a mixture of 10g water glass and 5g kaolin at 950°C, (c) is the result of heating a mixture of 10g water glass and 7g kaolin at 950°C, and (d) is the result of heating a mixture of 10g water glass and 3.5g kaolin at 950°C. Through this, it can be seen that when 7g of kaolin is added, it does not react with water glass and exists as kaolin alone; therefore, it is determined that it is desirable to add less than 5g of kaolin. In other words, it was confirmed that for every 1 part by weight of water glass, an inorganic curing agent, the thickening agent kaolin must be added in an amount of less than 0.5 parts by weight to perform the thickening function.

[0080] Meanwhile, as the amount of kaolin was reduced from 10g to 3.5g, it was observed that the peak intensity around 27, which represents the peak of heat-treated kaolin, decreased, and the peak intensity around 22, which is generated by new chemical bonding between kaolin and water glass, increased. Through this, it was confirmed that kaolin acts not only as a thickening agent but also as a crosslinking agent. In other words, it is considered desirable to add less than 0.35 parts by weight of kaolin, a thickening agent, to 1 part by weight of water glass, an inorganic curing agent, so that it can also perform the crosslinking function.

[0081] Referring to Fig. 8b to determine the optimal amount of Al(OH)3 added, the peaks around 45° and 67° are gamma-Al2O3 peaks, and the peak intensity showed a tendency to increase as the amount of Al(OH)3 increased. (a) is the result of heating Al(OH)3 powder at 950°C, (b) is the result of heating a mixture of 10g of water glass and 5g of Al(OH)3 at 950°C, and (c) is the result of heating a mixture of 10g of water glass and 7g of Al(OH)3 at 950°C. The fact that an Al2O3 peak appears even when 5g of Al(OH)3 is added can be interpreted to mean that the reactivity with water glass is low or that the amount of Al(OH)3 is high.

[0082] Referring to Figure 8c to determine the optimal amount of CaCO3 added, the reactivity between CaCO3 and water glass appears good, and the more CaCO3 is added, the stronger the new bond with water glass tends to appear. (a) is the result of heating CaCO3 powder at 950 ℃, (b) is the result of heating a mixture of 10g water glass and 5g CaCO3 at 950 ℃, and (c) is the result of heating a mixture of 10g water glass and 7g CaCO3 at 950 ℃.

[0084] As specific parts of the present invention have been described in detail above, those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not to limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention should be interpreted by the claims, and all technical concepts within an equivalent scope should be interpreted as being included within the scope of rights of the present invention.

Claims

Claim 1 An inorganic-based fire extinguishing agent for batteries, comprising an inorganic curing agent, a thickening agent, and a curing catalyst, wherein the thickening agent and the curing catalyst are composed of 0.1 to 1 part by weight per 1 part by weight of the inorganic curing agent, and the curing catalyst is at least two types selected from the group consisting of hydroxides, phosphates, carbonates, sulfates, and silica, and is characterized by being sprayed or applied in liquid form upon the occurrence of a fire to form an air-blocking insulating ceramic film of at least 0.5 mm, thereby promoting suffocation extinguishing and suppressing the spread of fire and combustion. Claim 2 The inorganic-based battery fire extinguishing agent according to claim 1, wherein the inorganic hardening agent is one or more selected from the group consisting of Portland cement, gypsum, alumina cement, polyphosphoates, sodium silicates, potassium silicates, lithium silicates, sodium carbonates, potassium carbonates, lithium carbonates, sodium hydroxide, potassium hydroxide, lithium hydroxide, and silicofluoride. Claim 3 An inorganic-based battery fire extinguishing agent according to claim 1, characterized in that the thickening agent is one or more selected from the group consisting of kaolin, diatomite, calcium carbonate, magnesium silicate, and montmorillonite. Claim 4 delete Claim 5 delete Claim 6 A battery pack comprising a fire extinguishing agent according to any one of claims 1 to 3.

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