KR-20260067374-A - Thermal insulation elastic member, method for manufacturing a thermal insulation elastic member, and secondary battery

Abstract

The present invention provides a thermal insulation elastic member having a single-layer structure capable of exhibiting excellent thermal insulation and elasticity, which includes a predetermined amount of thermal insulation material and an elastic material, and can be manufactured under high productivity. The thermal insulation elastic member is characterized by having a single-layer structure, comprising 15 to 75 mass% of heat-resistant particles and a total of 15 to 75 mass% of one or more organic elastic particles selected from rubber particles and resin particles, having a porosity of 70 to 95%, a bulk density of 80 to 400 kg/m², or comprising 15 to 75 mass% of heat-resistant particles and a total of 15 to 75 mass% of one or more organic elastic particles selected from rubber particles and resin particles, and is composed of a plurality of aggregated heat-resistant secondary particles in which organic elastic particles are attached to the surface of heat-resistant particles, with pores formed between the plurality of heat-resistant secondary particles, and is characterized by having a single-layer structure.

Inventors

• 고바야시 유키
• 스즈키 리쓰

Assignees

• 니찌아스 카부시키카이샤

Dates

Publication Date

20260512

Application Date

20241010

Priority Date

20231019

Claims (19)

1. It comprises 15 to 75 mass% of heat-resistant particles and a total of 15 to 75 mass% of one or more organic elastic particles selected from rubber particles and resin particles, The porosity is 70–95%, and the bulk density is 80–400 kg/ m³ , and Having a single-layer structure Thermal insulation elastic member characterized by
2. In claim 1, An insulating elastic member in which the calcium content of the total metal component converted to oxides exceeds 0 mass% when measured by a fluorescent X-ray device.
3. In claim 1, A thermal insulation elastic member having a calcium content of 60 mass% or less of the total metal content converted to oxides when measured by a fluorescent X-ray device.
4. In claim 1, A thermal insulation elastic member comprising a plurality of aggregated heat-resistant secondary particles, wherein the organic elastic particles are attached to the surface of the heat-resistant particles, and pores are formed between the plurality of heat-resistant secondary particles.
5. It comprises 15 to 75 mass% of heat-resistant particles and a total of 15 to 75 mass% of one or more organic elastic particles selected from rubber particles and resin particles, The above-mentioned heat-resistant secondary particles, to which the above-mentioned organic elastic particles are attached to the surface of the above-mentioned heat-resistant particles, are aggregated into a plurality of aggregated particles, and vacancies are formed between the plurality of heat-resistant secondary particles. Having a single-layer structure Thermal insulation elastic member characterized by
6. In claim 1 or claim 5, A thermal insulation elastic member in which the heat-resistant particles are calcium silicate particles or silica particles.
7. In claim 1 or claim 5, In addition, an insulating elastic member comprising 3 to 40 mass% in total of one or more reinforcing fibers selected from inorganic fibers and organic fibers.
8. In claim 7, A heat-resistant secondary particle having the organic elastic particle attached to the surface of the heat-resistant particle, and The secondary fibers, each having the organic elastic particles attached to the surface of the reinforcing fiber, are each aggregated into multiple aggregates, and A thermal insulation elastic member having a void formed between the heat-resistant secondary particle and the secondary fiber.
9. In claim 1 or claim 5, In addition, an insulating elastic member containing 5 to 50 mass% of functional particles.
10. In claim 1 or claim 5, In addition, an insulating elastic member containing more than 0 mass% and less than or equal to 3 mass% of a coagulant.
11. In claim 1 or claim 5, The above-mentioned insulating elastic member is disposed between adjacent secondary battery cells.
12. A method for manufacturing an insulating elastic member as described in claim 1 or claim 5, A water dispersion containing heat-resistant particles and one or more organic elastic particles selected from rubber particles and resin particles are mixed, and then dehydrated by gravity or suction. A method for manufacturing an insulating elastic member characterized by the following.
13. In claim 12, A method for manufacturing an insulating elastic member in which the heat-resistant particles are calcium silicate particles.
14. In claim 12, A method for manufacturing an insulating elastic member, comprising mixing a water dispersion containing heat-resistant particles with one or more organic elastic particles selected from rubber particles and resin particles, then further mixing a coagulant, and subsequently dewatering by gravity or suction.
15. In claim 12, A method for manufacturing an insulating elastic member, comprising mixing a water dispersion containing heat-resistant particles and one or more reinforcing fibers selected from inorganic fibers and organic fibers with one or more organic elastic particles selected from rubber particles and resin particles, and then dehydrating by gravity or suction.
16. In claim 12, A method for manufacturing an insulating elastic member, comprising mixing a water dispersion containing heat-resistant particles and one or more reinforcing fibers selected from inorganic fibers and organic fibers with one or more organic elastic particles selected from rubber particles and resin particles, then further mixing a coagulant, and subsequently dewatering by gravity or suction.
17. In claim 12, A method for manufacturing an insulating elastic member, comprising mixing a water dispersion containing one or more reinforcing fibers selected from heat-resistant particles, inorganic fibers, and organic fibers, and functional particles, with one or more organic elastic particles selected from rubber particles and resin particles, and then dehydrating by gravity or suction.
18. In claim 12, A method for manufacturing an insulating elastic member, comprising mixing a water dispersion containing one or more reinforcing fibers selected from heat-resistant particles, inorganic fibers, and organic fibers, and functional particles, with one or more organic elastic particles selected from rubber particles and resin particles, then further mixing a coagulant, and subsequently dewatering by gravity or suction.
19. A secondary battery characterized in that the insulating elastic member described in claim 1 or claim 5 is disposed between adjacent secondary battery cells.

Description

Thermal insulation elastic member, method for manufacturing a thermal insulation elastic member, and secondary battery The present invention relates to an insulating elastic member, a method for manufacturing an insulating elastic member, and a secondary battery. Conventionally, electric vehicles that drive using an electric motor, or hybrid vehicles that drive using both an engine and an electric motor, are equipped with a storage module (battery) as a driving source for the electric motor. In the above-described storage module, a plurality of storage elements (secondary battery cells) having positive and negative electrode terminals are arranged, and by connecting the electrode terminals of adjacent secondary battery cells directly to a bus, a series of secondary battery cells is formed by connecting a plurality of secondary battery cells in series, and a plurality of such series of secondary battery cells are arranged as needed in relation to output, etc. However, during the operation of the above-mentioned storage module, there is a possibility that the battery pack, etc. may be damaged due to overheating of the secondary battery cells constituting the storage module. For example, given that a flammable organic electrolyte is used in lithium secondary batteries, there are cases where a secondary battery cell undergoes thermal runaway due to causes such as an internal short circuit, leading to ignition or smoke. In such cases, if ignition or smoke occurs in a single secondary battery cell constituting the battery pack, heat can be conducted to surrounding secondary battery cells, potentially causing a larger ignition, smoke, or explosion. In order to suppress heat conduction to the surroundings in the event that ignition or smoke is generated from the above secondary battery cell, a method of installing an insulating material between adjacent secondary battery cells can be considered. Meanwhile, since the side of the secondary battery cell may bulge due to a temperature rise during charging or discharging, the insulating material installed between the aforementioned multiple secondary battery cells is required to have elasticity that prevents damage during the expansion of the secondary battery cells, and as such an insulating material, it is proposed to have a multilayer structure as described in Patent Document 1, for example. FIG. 1 is a schematic diagram showing an enlarged cross-section of an example of an insulating elastic member according to the present invention. FIG. 2 shows a scanning electron microscope (SEM) image of a cross-section thereof in an example of an insulating elastic member according to the present invention. FIG. 3 shows a scanning electron microscope (SEM) image of a cross-section of an example of an insulating elastic member according to the present invention. Figure 4 is a drawing showing a scanning electron microscope (SEM) image that partially magnifies the cross-section of the insulating elastic member shown in Figure 2. Figure 5 is a drawing showing a scanning electron microscope (SEM) image that partially magnifies the cross-section of the insulating elastic member shown in Figure 2. FIG. 6 is a partial enlarged view schematically showing the state in a water dispersion containing calcium silicate particles and organic elastic particles in a method for manufacturing an insulating elastic member according to the present invention. FIG. 7 is a partial enlarged view schematically showing the state in a water dispersion containing calcium silicate particles and organic elastic particles in a method for manufacturing an insulating elastic member according to the present invention. FIG. 8 is a diagram showing the manufacturing flow in a manufacturing form example corresponding to a comparative example of the manufacturing method according to the present invention. FIG. 9 is a drawing showing the manufacturing flow in a manufacturing form example corresponding to an embodiment of the manufacturing method according to the present invention. FIG. 10 is a drawing showing the manufacturing flow in a manufacturing form example corresponding to an embodiment of the manufacturing method according to the present invention. FIG. 11 is a drawing showing the manufacturing flow in a manufacturing form example corresponding to an embodiment of the manufacturing method according to the present invention. FIG. 12 is a scanning electron microscope (SEM) image showing a partially magnified cross-section of an insulating elastic member according to an embodiment of the present invention. FIG. 13 is a scanning electron microscope (SEM) image showing a partially magnified cross-section of an insulating elastic member according to an embodiment of the present invention. FIG. 14 is a scanning electron microscope (SEM) image showing a partially magnified cross-section of an insulating elastic member according to an embodiment of the present invention. FIG. 15 is a scanning electron microscope (SEM) i