KR102909881B1 - Method of manufacturing the fireproofing pads for battery and the fireproofing pads for battery made thereby - Google Patents

Abstract

The present invention relates to a pressure pad used between cells of a secondary battery, and more particularly, to a method for manufacturing a fireproof pressure pad for a battery having fire resistance and buffering and fire resistance, and a fireproof pressure pad. The present invention discloses a method for manufacturing a fireproof pressure pad for a battery, and a fireproof pressure pad manufactured by the method, characterized in that the method includes a step of manufacturing a foam resin (MCF) for manufacturing a fireproof pressure pad including a polyol system A, an isocyanate system B, and a foaming gas C; a step of preparing a primary carrier film (PET), positioning a fireproof high-temperature insulating material to be laminated on the primary carrier film, discharging the foam resin (MCF) on the high-temperature insulating material to foam during transport, and controlling the thickness of the foamed MCF; and a step of maturing the foam foam after the foaming is completed.

Description

Method of manufacturing the fireproofing pads for batteries and the fireproofing pads for batteries made thereby

The present invention relates to a pressure pad used between cells of a secondary battery, and more specifically, to a method for manufacturing a fire-resistant pressure pad for a battery, which implements self-flame retardancy through organic and inorganic flame retardants for polyurethane-type MCF (Micro Cellular Foam), which is a buffer material of a battery, and also implements direct adhesion using a flame-retardant material other than a carrier film during the manufacturing process of MCF, thereby implementing a buffer function and fire resistance without a separate adhesive layer, and a fire-resistant pressure pad manufactured thereby.

With the recent rapid expansion of electric vehicles, the need for and demand for high-performance lithium-ion batteries is rapidly increasing. Existing lithium-ion battery systems, including graphite anodes, have an energy density limit of approximately 750 Wh/L, necessitating the development of electric vehicles capable of driving longer distances on a single charge. To address this, research and development of next-generation, high-energy lithium metal battery systems, which replace existing graphite or silicon anode active materials with lithium metal, is gaining traction.

However, lithium metal batteries experience significant volume changes during charge and discharge due to the characteristics of the lithium anode. In particular, during long-life operation, gas is generated within the cell due to electrolyte reactions, cathode deterioration, etc., and as the porous lithium layer continues to grow due to dendritic lithium growth, the cell volume increases significantly compared to its initial thickness as the guaranteed lifespan approaches.

Furthermore, increased cell volume generates high surface pressures exceeding 1 MPa on module end plates within electric vehicle battery packs, potentially leading to deformation or destruction. Significant changes to the existing module design, such as introducing leaf springs or modifying the packaging to control this high surface pressure, can lead to design burden, increased costs, and reduced battery pack energy density.

These secondary batteries suffer from cell swelling during charging and discharging, which reduces their durability. To prevent this, cushioning materials are inserted between the cells. However, they are vulnerable to fire caused by external shocks, making them difficult to extinguish in the event of a fire. Therefore, fire-resistant materials are required to facilitate user escape or extinguish the fire. However, existing cushioning materials have clear limitations.

Accordingly, the battery system requires the development of a refractory pressure pad for pressure control and fire resistance control.

Republic of Korea Patent Publication No. 10-2024-0084772 Republic of Korea Patent Publication No. 10-2024-0031585 Republic of Korea Patent Publication No. 10-2023-0021897 Republic of Korea Patent Publication No. 10-1924447

The present invention provides a method for manufacturing a fire-resistant pressure pad for a battery, which can implement self-flame retardancy through organic and inorganic flame retardants for polyurethane-type MCF (Micro Cellular Foam), which is a buffer material for a battery, and also implement direct adhesiveness by using a flame retardant material other than a carrier film during the manufacturing process of MCF, thereby implementing a buffer function and fire resistance without a separate adhesive layer, and a fire-resistant pressure pad manufactured thereby, the problem being solved.

The method for manufacturing a fire-resistant pressure pad for a battery according to the present invention, which solves the above-described problem, is characterized by including a step of manufacturing a foam resin (MCF) for manufacturing a fire-resistant pressure pad, which includes a polyol system A, an isocyanate system B, and a foaming gas C; a step of preparing a primary carrier film (PET), positioning a fire-resistant high-temperature insulating material so as to be laminated on the primary carrier film, and applying the foam resin (MCF) by discharging it on the high-temperature insulating material, and forming a foamed foam by foaming the foam resin (MCF) applied on the high-temperature insulating material during transport; a step of adjusting the thickness of the foamed foam after the foaming step; and a step of aging the foamed foam formed after the thickness adjustment.

Another method for manufacturing a fire-resistant pressure pad for a battery according to the present invention, which solves the above-mentioned problem, comprises the steps of manufacturing a foam resin (MCF) for manufacturing a fire-resistant pressure pad, which comprises a polyol system A, an isocyanate system B, and a foaming gas C; a foaming step of preparing a primary carrier film (PET), positioning a fire-resistant high-temperature insulating material so as to be laminated on the primary carrier film, discharging the foam resin (MCF) on the high-temperature insulating material, and sequentially supplying the fire-resistant high-temperature insulating material and a secondary carrier film (PET) on the discharged foam resin (MCF) so as to be positioned thereon, and then performing foaming during transport; and a maturing step of maturing the foam foam after the foaming is completed.

Here, the polyol system A constituting the foam resin (MCF) is a mixture of 100 parts by weight of polyol A, 15 to 50 parts by weight of polyol B, and 15 to 30 parts by weight of polyol C, and 15 to 45 parts by weight of a flame retardant.

The polyol a is a polypropylene triol having a number average molecular weight of 400 to 1200, the polyol b is a propanediol having a number average molecular weight of 3000 to 4500 obtained by block copolymerizing propylene glycol and ethylene glycol in a ratio of 2:1, and the polyol c is a divalent diol derived from caprolactone having a number average molecular weight of 300 to 1000.

Here, the isocyanate system B constituting the foam resin (MCF) is characterized by being a mixture in a weight ratio of 20 to 25 parts by weight of modified carbonodimide methylene diphenyl diisocyanate and 75 to 80 parts by weight of methylene diphenyl diisocyanate.

Here, the high-temperature insulation material is characterized by being any one selected from the group consisting of a MICA film, silica nonwoven fabric (silica felt), glass nonwoven fabric (Galss felt), glass fabric (Glass fabric), and silica fabric (Silica fabric) with a thickness of 0.1 to 2 mm.

Here, the foaming step is characterized in that a PET film is installed as a primary carrier film using tension, a high-temperature insulation material is installed as a secondary carrier film on the primary carrier film, and a polyol system A, an isocyanate system B, and a foaming gas C are mechanically mixed and discharged on the high-temperature insulation material, and the thickness is implemented by adjusting the gap between rollers to control the thickness, thereby foaming.

Here, the maturation step is characterized by completing the urethane foaming reaction through maturation in a temperature range of 90 to 100 degrees and a maturation time range of 7 to 10 minutes.

Here, the foaming resin (MCF) is mixed by supplying foaming gas C to polyol system A in a microporous form through a micropore filter, mixing the mixture, and adding 30 to 60 parts by weight of isocyanate system B to 100 parts by weight of polyol system A mixed with foaming gas C to a mixing head and stirring at a speed of 300 to 1500 RPM to supply a polyurethane foam composition, and the foaming gas C is characterized in that the foaming resin is prepared by using an inert gas of any one of CO ₂ , N ₂ , or a mixture thereof.

In addition, the present invention provides a fire-resistant pressure pad for a battery, which is manufactured by the above-described manufacturing method and is characterized by comprising a primary carrier film (PET) layer, a fire-resistant MICA film layer that is spread while maintaining tension on the primary carrier film, a foamed MCF (Micro Cellular Foam) layer that is laminated and bonded on the fire-resistant MICA film, a fire-resistant MICA film layer laminated and bonded on the MCF layer, and a secondary carrier film (PET) layer laminated and bonded on the MICA film layer.

Conventional refractory pressure-sensitive materials utilize adhesive layers to combine different materials. However, these require flame retardancy and fire resistance in the adhesive, necessitating additional technology. The present invention utilizes direct foaming onto the refractory material, enhances adhesive strength through polyurethane aging, and shortens the process, thereby improving material stability and technological prowess.

In addition, in general, in the maturation of MCF, refractory materials have insulating properties and do not mature normally, and in the case of silicone-based refractory materials, urethane and peeling occur.

Accordingly, the present invention addresses this issue by controlling the reactivity (initial and aging reactions) of MCF, and mitigates changes in properties due to insulation by adjusting the properties through composition. Furthermore, for silicone-based refractory materials, the issue was resolved by introducing a modified silicone-based polyol into the MCF raw material composition.

Figure 1a is a cross-sectional view of a refractory pressure-sensitive material for a battery manufactured according to an embodiment of the present invention.
Figure 1b is a cross-sectional view of a refractory pressure-sensitive material for a battery manufactured according to another embodiment of the present invention.
Figure 2a is a process diagram illustrating a manufacturing process of a method for manufacturing a refractory pressure pad for a battery of the present invention.
FIG. 2b is a process diagram illustrating a manufacturing process of a method for manufacturing a refractory pressure pad for a battery, which is another embodiment of the present invention of FIG. 1b.
Figure 3 is a photograph of an MCF product, which is a refractory pressure-sensitive material for a battery manufactured according to one embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

The purpose of the present invention is to provide a method for manufacturing a fire-resistant surface pressure pad for a battery, which is a composite material that implements self-flame retardancy through organic and inorganic flame retardants for polyurethane-type MCF (Micro Cellular Foam), which is a buffer material for a battery, and also implements direct adhesion by using a flame retardant material other than a carrier film during the manufacturing process of MCF, thereby implementing a buffer function and fire resistance without a separate adhesive layer, and a fire-resistant surface pressure pad manufactured by the manufacturing method. The method for manufacturing a fire-resistant surface pressure pad for a battery according to the present invention, which achieves the above purpose, comprises the steps of manufacturing a foam resin (MCF) for manufacturing a fire-resistant surface pressure pad, which includes a polyol system A, an isocyanate system B, and a foaming gas C, as illustrated in the attached drawings FIGS. 1A and 2A; The invention is completed by a method for manufacturing a fire-resistant pressure pad for a battery, characterized by comprising: a foaming step of preparing a primary carrier film (PET), positioning a fire-resistant high-temperature insulation material to be laminated on the primary carrier film, and injecting the foamed resin (MCF) onto the high-temperature insulation material to foam during transport; a thickness-control step of controlling the thickness of the foamed MCF; and a maturing step of maturing the foam foam after the foaming is completed.

Another method for manufacturing a fireproof pressure pad for a battery according to the present invention, which achieves the above object, comprises the steps of manufacturing a foam resin (MCF) for manufacturing a fireproof pressure pad including a polyol system A, an isocyanate system B, and a foaming gas C, as shown in the attached drawings FIGS. 1b and 2b; a foaming step of preparing a primary carrier film (PET), positioning a fireproof MICA film to be laminated on the primary carrier film, discharging the foam resin (MCF) on the MICA film, and sequentially supplying the fireproof MICA film and the secondary carrier film (PET) on the discharged foam resin (MCF) so as to be positioned thereon, and then performing foaming during transport; and an aging step of aging the foam foam after the foaming is completed.

At this time, in the above two manufacturing processes, MCF is mixed with a polyol system, a flame retardant, and an isocyanate, and is discharged at a discharge rate of 185 g/min. At this time, it is preferable to supply the foaming gas at a condition of 0.34 L/min. When the supply conditions of the foaming gas are met, a pressure pad product having a density of 280 to 285 kg/m ³ can be realized.

An example of the present invention will be described more specifically with reference to the attached drawing 2a.

A primary carrier film (PET; 20) and a primary high-temperature insulation material (22) are sequentially laminated and simultaneously supplied, the primary carrier film and the primary high-temperature insulation material are bonded by a pressing roller (24), and while being transported in a bonded state, a foaming resin (MCF; 26) is discharged on the primary high-temperature insulation material (22). When the foaming resin (MCF; 26) is discharged, it is discharged at a discharge rate of 185 g/min per minute, and at the same time, a foaming gas is supplied and discharged under the condition of 0.34 L/min.

While the above foamed resin (MCF; 26) is being discharged, it is continuously transported by a transport belt (28), and foaming progresses during the transport, and the MCF that has completed the foaming is transported to a thickness control device (38), and the thickness of the foamed resin (MCF; 26) that has been set in advance is controlled within the thickness control device (38), and the laminate (40) whose thickness has been controlled is transported to a maturation device (42), and while being transported by a transport belt (44), the foamed MCF undergoes a maturation process.

At this time, as the foamed MCF matures, the adhesion with the high-temperature insulation material (22) becomes stronger, thereby improving the adhesive strength. When the above-mentioned maturation process is completed, the final refractory pressure-sensitive film is formed, and it is transferred to a cutting device (50) by a transfer roller (48) and cut into a certain size according to the manufacturing process design. The cut refractory pressure-sensitive film is then collected to complete the process.

In another embodiment of the present invention, as shown in the attached drawing 2b, a primary carrier film (PET; 20) and a primary high-temperature insulating material (22) are supplied simultaneously so as to be sequentially laminated, the primary carrier film and the primary high-temperature insulating material are bonded by a pressing roller (24), and while being transported in a bonded state, a foaming resin (MCF; 26) is discharged on the primary high-temperature insulating material (22), at a discharge rate of 185 g/min, and at the same time, a foaming gas is supplied and discharged under the condition of 0.34 L/min.

While the above foamed resin (MCF; 26) is being discharged, it is continuously transported by a transport belt (28), and foaming progresses during transport, and a secondary high-temperature insulating material (30) and a secondary carrier film (PET; 32) are sequentially laminated on the MCF where the foaming is completed.

At this time, after the secondary high-temperature insulation material (30) and the secondary carrier film (PET; 32) are sequentially laminated, they pass through the pressing rollers (34, 36) and are transferred to the thickness control device (38) in a bonded state, and the thickness of the foamed resin (MCF; 26) set in advance is controlled within the thickness control device (38). At this time, it is preferable to use a heating roller as the pressing roller.

The laminate (40) whose thickness has been adjusted is transferred to a maturing device (42), and while being transferred by a conveying belt (44), the foamed MCF undergoes a maturing process. At this time, as the foamed MCF is maturing, the adhesion with the first and second high-temperature insulating materials (22, 30) is firmly formed, thereby improving the adhesive strength. When the maturing process is completed, the final refractory surface pressure film is formed, and is transferred to a cutting device (50) by a conveying roller (48) to go through a process of cutting into a certain size according to the manufacturing process design, and the cut refractory surface pressure film is collected to complete the process.

According to the present invention, the first and second high-temperature insulating materials used in the manufacturing process of the present invention, as illustrated in FIG. 2a or 2b, are in the form of cloth, fabric, non-woven fabric, or film, and use materials that block fire at a temperature of 400 to 1,300°C. Preferably, the high-temperature insulating material uses any one selected from the group consisting of a MICA film, silica non-woven fabric, glass non-woven fabric, glass fabric, and silica fabric, each having a thickness of 0.1 to 2 mm.

According to the present invention, the first and second high-temperature insulation materials may be made of the same material, or may be made of different materials depending on the design of the final product.

According to the present invention, preferably, the polyol system A constituting the foam resin (MCF) is a mixture of 100 parts by weight of polyol composed of 15 to 50 parts by weight of polyol a, 20 to 70 parts by weight of polyol b, and 15 to 30 parts by weight of polyol c, and 15 to 45 parts by weight of flame retardant.

The above polyol a is a polypropylene triol having a number average molecular weight of 400 to 1200, the above polyol b is a propanediol having a number average molecular weight of 3000 to 4500 obtained by block copolymerizing propylene glycol and ethylene glycol in a ratio of 2:1, and the above polyol c is a divalent diol derived from caprolactone having a number average molecular weight of 300 to 1000.

The above flame retardant is at least one selected from the group consisting of a melamine flame retardant, an organic phosphorus flame retardant, and an inorganic phosphorus flame retardant, and preferably two or more are used.

If the polyol a is used in an amount less than 15 parts by weight, the recovery characteristics, which are an important feature of MCF, are lost, and if it exceeds 50 parts by weight, the hardness increases at low temperatures and the cushioning effect is lost. In addition, the mixing ratio of polyol b and c is a mixing ratio for controlling the reactivity to form MCF, and is a condition for matching the maturation conditions of 90 to 100 degrees for 7 to 10 minutes, and if polyol b is added in excess, the reaction speed becomes slow, so the maturation temperature must be set to exceed 100 degrees or the time must be set to exceed 10 minutes, setting excessive maturation conditions. In addition, if polyol c is added in excess, the reaction speed becomes fast, which interferes with the formation of thickness and density, so that a normal product cannot be produced.

According to the present invention, the isocyanate system B constituting the foam resin (MCF) preferably uses a mixture in which 20 to 25 parts by weight of modified carbonodimide methylene diphenyl diisocyanate and 75 to 80 parts by weight of methylene diphenyl diisocyanate are mixed.

According to the present invention, the high-temperature insulating material uses any one selected from the group consisting of a MICA film, silica nonwoven fabric (silica felt), glass nonwoven fabric (Galss felt), glass fabric (Glass fabric), and silica fabric (Silica fabric) having a thickness of 0.1 to 2 mm.

According to the present invention, preferably, the foaming step is characterized in that a PET film is installed as a primary carrier film using tension, a high-temperature insulating material is installed as a secondary carrier film on the primary carrier film, and the high-temperature insulating material is laminated, and a polyol system A, an isocyanate system B, and a foaming gas C are mechanically mixed and discharged on the laminated high-temperature insulating material, and the thickness is implemented by adjusting the distance between rollers to control the thickness, thereby foaming.

Here, the above ‘thickness’ refers to the thickness of the composite material after foaming, and the characteristic is that the thickness of the application is adjusted during discharge by adjusting the distance between rollers, and the thickness of the final composite material is formed as it is after curing.

According to the present invention, preferably, the maturing step is performed at a temperature range of 90 to 100 degrees and a maturing time range of 7 to 10 minutes to complete the urethane foaming reaction.

According to the present invention, preferably, the foaming resin (MCF) is mixed by supplying foaming gas C to polyol system A in a fine gas form through a fine filter, and mixing the same, and charging 30 to 60 parts by weight of isocyanate system B to a mixing head at a weight ratio of 100 parts by weight of polyol system A mixed with foaming gas C and stirring at a speed of 300 to 1500 RPM to supply a polyurethane foam composition, and the technical feature thereof is that the foaming resin is prepared by using an inert gas of any one of CO ₂ , N ₂ or a mixture thereof as the foaming gas C.

At this time, if the isocyanate exceeds the critical range, some of it solidifies during storage and precipitates, causing a change in the average NCO, which affects the physical properties through a change in the index of the MCF formation.

According to the present invention, the isocyanate system B constituting the foam resin (MCF) is preferably used by mixing 20 to 25 parts by weight of modified carbonodimide methylenediphenyl diisocyanate and 75 to 80 parts by weight of methylenediphenyl diisocyanate, which are proportions that maintain a liquid state under storage conditions.

At this time, if the modified carbonodimide methylenediphenyl diisocyanate is used in an amount of less than 20 parts by weight, there is a problem that some curing occurs at room temperature, which damages the uniformity of NCO% and affects the reaction and physical properties, and if it is used in an amount exceeding 25 parts by weight, there may be a problem that the price of the raw material increases.

In addition, if the above methylene diphenyl diisocyanate is used in an amount less than 75 parts by weight, there is a problem that the price of raw materials increases, and if it is used in an amount exceeding 80 parts by weight, some of the raw materials may harden at room temperature, changing the NCO, affecting the physical properties and reaction, and there may be a problem that a normal product cannot be manufactured.

Conventional MDI suffers from crystallization at room temperature during the winter. To address this issue, the present invention incorporates modified MDI. However, using a small amount of modified MDI fails to address the conventional crystallization issue, while excessive use increases the price. Furthermore, when crystallized and then liquefied, the NCO changes, affecting the reaction and physical properties.

As described above, according to the method for manufacturing a battery-resistant surface pressure pad provided according to the present invention, a battery-resistant surface pressure pad can be provided, which is composed of a primary carrier film (PET) layer (12), a refractory MICA film layer (14) laminated and bonded on the primary carrier film layer (12), and a foamed MCF (Micro Cellular Foam) layer (18) laminated and bonded on the refractory MICA film layer (14), as shown in the attached drawing 1a.

Another structure of a fire-resistant pressure pad for a battery can be provided, which comprises a primary carrier film (PET) layer (12), a fire-resistant MICA film layer (14) laminated and bonded on the primary carrier film layer (12), a foamed MCF (Micro Cellular Foam) layer (18) laminated and bonded on the fire-resistant MICA film layer (14), a fire-resistant MICA film layer (16) laminated and bonded on the MCF layer (18), and a secondary carrier film (PET) layer (13) laminated and bonded on the MICA film layer (16), as shown in the attached drawing 1b.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. However, the following embodiments are merely illustrative examples for illustrating the present invention and are not intended to limit the present invention. Those skilled in the art may make any number of modifications within the scope of the invention as set forth in the claims.

[Example 1]

Primary and secondary carrier films: 0.75mm thick PET film

Primary and secondary high-temperature insulation: MICA film with a thickness of 0.1 to 2 mm

Foam resin MCF: Polyol system, flame retardant, and isocyanate were mixed in a weight ratio of 100:45:40, and discharged at a discharge rate of 185 g/min. At this time, the foaming gas was supplied at a condition of 0.34 L/min.

When done, a product with a density of 280 kg/m3 is realized.

> Polyol: A polyol composed of a mixture of 15 to 30 parts by weight of polypropylene triol (GP-700) with a number average molecular weight of 400 to 1200, propanediol (VORANOL 4000) with a number average molecular weight of 3000 to 4500 obtained by block copolymerization of propylene glycol and ethylene glycol in a ratio of 2:1, and a divalent diol (CAPA-3022) derived from caprolactone with a number average molecular weight of 300 to 1000.

> Isocyanate: A mixture of 20 to 25 parts by weight of modified carbonodimide methylene diphenyl diisocyanate and 75 to 80 parts by weight of methylene diphenyl diisocyanate (COMNATE LL)

> Foaming gas: nitrogen gas

The first carrier film and the first MICA film were sequentially laminated and simultaneously supplied, and while being transported, a foaming resin MCF mixed with polyol system A, isosystem B, and foaming gas C was discharged onto the first MICA film. The discharged foaming resin MCF was applied onto the first MICA film, and as shown in Fig. 2a, the applied foaming resin MCF was transported by the transport belt and foamed to form a foamed foam. The formed foam passed through a pressing roller installed in a thickness control device section, and the foamed foam was adjusted to the thickness of the final composite material by passing through a thickness control device that adjusts the thickness such as the pressing roller gap, and the foamed foam whose thickness was adjusted in this way was transferred to a final curing device and cured under curing conditions of 90 to 100 degrees for 7 to 10 minutes to firmly adhere the foamed MCF and the MICA film, thereby processing them into a pressure pad. The aged pressure pad was transferred to a cutting device to prepare three specimens with a size of 125 mm × 13 mm × 3 mm (width × length × height).

The above-prepared specimens were subjected to a vertical flame retardancy test according to the UL94 V-0 standard. The test involves first heating the sample with a vertical flame, then heating it a second time to determine whether reflaming and flame drop occur, and the time for self-extinguishment is measured as follows to determine flame retardancy performance appropriate to the V grade.

[Vertical flame retardancy test standards]

t1 - Afterburn time (s) after first contact

t2 - Afterburn time (s) after second contact

t3 - time after second contact (s)

Pretreatment: Leave for 48 hours at 23 +-2 degrees Celsius and 50 +-10% relative humidity

V-0 criteria: t2 less than 10 seconds, t1+t2 less than 50 seconds, t2+t3 less than 30 seconds, no ignition of cotton due to falling objects

[Example 2]

As illustrated in Fig. 2b, the applied foam resin MCF is transported by the transport belt and foamed to form a foam. The formed foam is supplied by sequentially stacking the secondary MICA film and the secondary carrier film (PET) before being transported to the thickness control device unit, and the foam is formed by stacking them. Except that the foam is processed under the same conditions as in Example 1, and three specimens were prepared with a size of 125 mm × 13 mm × 3 mm (width × length × height) for the pressure pad. (Samples 4, 5, 6)

The prepared specimens were tested using the same test method as Example 1.

division Sample 1 Sample 2 Sample 3 t1 5 6 4 t1+t2 5 6 4 t2+t3 0 0 0 division Sample 4 Sample 5 Sample 6 t1 5 5 4 t1+t2 5 5 4 t2+t3 0 0 0

Results of Table 1 above

It was found that the pressure-resistant film provided according to the present invention can provide an excellent pressure-resistant pad for a battery by complying with the UL94 V-0 standard.

A peeling evaluation was performed on the specimen manufactured in Example 1 above, and the peeling evaluation results are shown in Table 2 below.

FOAM PROPERTIES 3T S CD C CD Load/Width Position
Maximum load (kgf/cm) fracture fracture fracture fracture fracture fracture fracture fracture average fracture fracture ※ Pre-test (load): 0.02 start, speed 15mm/min

As a result of the above Table 2, it was confirmed that the MICA and MCF of the composite materials showed fracture characteristics and that there were no problems with the adhesive strength.

10: Pressure pad 12: Primary carrier film layer
13: Secondary carrier film layer 14, 16: MICA film layer
18: MCF foam layer 20, 32: Primary and secondary carrier films (PET)
22, 30: Primary and secondary high-temperature insulation 24, 34, 36: Compression roller
26: Foamed resin (MCF) 28, 44: Conveyor belt
38: Foaming device 40: Laminate
42: Aging device 46: Foamed MCF
48: Transfer roller 50: Cutting device
52: Cut anti-screen pressure film

Claims (10)

A step for manufacturing a foam resin (MCF) for manufacturing a refractory pressure pad comprising a polyol system A, an isocyanate system B, and a foaming gas C;
A foaming step of preparing a primary carrier film (PET), positioning a refractory high-temperature insulation material to be laminated on the primary carrier film, and discharging the foaming resin (MCF) on the high-temperature insulation material to perform foaming during transport;
A thickness control step for controlling the thickness of the above-mentioned foamed MCF;
A method for manufacturing a refractory pressure pad for a battery, characterized in that it includes a maturing step of maturing the foam after the above foaming is completed. A step for manufacturing a foam resin (MCF) for manufacturing a refractory pressure pad comprising a polyol system A, an isocyanate system B, and a foaming gas C;
A foaming step of preparing a primary carrier film (PET), positioning a refractory high-temperature insulating material so as to be laminated on the primary carrier film, discharging the foamed resin (MCF) on the high-temperature insulating material, and sequentially supplying the refractory high-temperature insulating material and the secondary carrier film (PET) so as to be positioned on the discharged foamed resin (MCF), and then performing foaming during transport;
A thickness control step for controlling the thickness of the above-mentioned foamed MCF;
A method for manufacturing a refractory pressure pad for a battery, characterized in that it includes a maturing step of maturing the foam after the above foaming is completed. In claim 1 or 2,
The polyol system A constituting the above foam resin (MCF) is a mixture of 100 parts by weight of polyol composed of 15 to 50 parts by weight of polyol a, 20 to 70 parts by weight of polyol b, and 15 to 30 parts by weight of polyol c and 15 to 45 parts by weight of a flame retardant.
A method for manufacturing a refractory pressure pad for a battery, characterized in that the polyol a is a polypropylene triol having a number average molecular weight of 400 to 1200, the polyol b is a propanediol having a number average molecular weight of 3000 to 4500 obtained by block copolymerizing propylene glycol and ethylene glycol in a ratio of 2:1, and the polyol c is a divalent diol derived from caprolactone having a number average molecular weight of 300 to 1000. In claim 1 or 2,
A method for manufacturing a refractory pressure pad for a battery, characterized in that the isocyanate system B constituting the foam resin (MCF) is a mixture of 20 to 25 parts by weight of modified carbonodimide methylene diphenyl diisocyanate and 75 to 80 parts by weight of methylene diphenyl diisocyanate. In claim 1 or 2,
A method for manufacturing a fire-resistant pressure pad for a battery, characterized in that the high-temperature insulating material is any one selected from the group consisting of a MICA film, silica felt, glass non-woven fabric, glass fabric, and silica fabric with a thickness of 0.1 to 2 mm. delete In claim 1 or 2,
A method for manufacturing a refractory pressure pad for a battery, characterized in that the above maturation step is performed at a temperature range of 90 to 100 degrees for a maturation time of 7 to 10 minutes to complete the urethane foaming reaction. In claim 1 or 2,
The above foam resin (MCF) is supplied and mixed by micro-gasifying foaming gas C into polyol system A using a micro filter, and isocyanate system B is supplied in a weight ratio of 30 to 60 parts by weight to 100 parts by weight of polyol system A mixed with foaming gas C, and stirred at a speed of 300 to 1500 RPM to supply a polyurethane foam composition, and the method for manufacturing a refractory pressure pad for a battery is characterized in that the foam resin is prepared by using an inert gas of any one of CO ₂ , N ₂ or a mixture thereof as the foaming gas C. In the third paragraph,
A method for manufacturing a fire-resistant pressure pad for a battery, characterized in that the flame retardant uses a mixture of two or more selected from the group consisting of a melamine-based flame retardant, an organic phosphorus-based flame retardant, and an inorganic phosphorus-based flame retardant. A fire-resistant pressure pad for a battery, characterized in that it is manufactured according to claim 1, and comprises a primary carrier film (PET) layer, a fire-resistant MICA film layer laminated and bonded on the primary carrier film layer, a foamed MCF (Micro Cellular Foam) layer laminated and bonded on the fire-resistant MICA film, a fire-resistant MICA film layer laminated and bonded on the MCF layer, and a secondary carrier film (PET) layer laminated and bonded on the MICA film layer.