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Thermal insulation material for battery pack, and battery pack

A technology for thermal insulation materials and battery packs, which is applied to battery pack components, secondary batteries, and the isolation of batteries from their environment. , Excellent thermal insulation, not easy to break

Active Publication Date: 2022-02-22
SUMITOMO RIKO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a conventional heat insulating material using a urethane adhesive is used in a high-temperature atmosphere of about 500°C, the urethane adhesive, which is an organic component, decomposes, deteriorates, and generates gas or cracks. and the hidden danger of not being able to maintain its shape
In addition, since the urethane adhesive is relatively soft, there is a problem that if it is compressed, the heat insulating material will be crushed and it will be difficult to maintain the heat insulating structure.

Method used

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  • Thermal insulation material for battery pack, and battery pack
  • Thermal insulation material for battery pack, and battery pack
  • Thermal insulation material for battery pack, and battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 15、 Embodiment 17

[0087]Add polyethylene oxide (manufactured by Sumitomo Seika Co., Ltd.) "PEO (registered trademark)-29") and stirred. Next, the pulverized silica airgel was added and stirred, and glass fibers were further added and stirred to prepare a coating material for a heat insulating layer. In addition, when it is necessary to adjust the viscosity of the coating material for heat insulating layers, colloidal silica is used after diluting with water. The pulverized product of silica airgel is obtained by pulverizing silica airgel ("P200" manufactured by Cabot Corporation) having hydrophobic sites on the surface and inside with a household mixer. is 100 μm. As for the glass fiber, five types (A to E) having different aspect ratios (length / diameter) were selected from "chopped strands" manufactured by NEC Glass Co., Ltd. and used.

Embodiment 16

[0089] A heat-insulating layer was prepared in the same manner as in Example 2, except that non-pulverized silica airgel ("P200" manufactured by Cabot Corporation) was used instead of the pulverized silica airgel. coating. The paints for heat insulating layers of Examples 1 to 17 are included in the concept of the paint for heat insulating layers of the present invention.

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Abstract

A thermal insulation material (3) for a battery pack comprises a thermal insulation layer (30), and a first substrate (31) and a second substrate (32) that are positioned sandwiching the thermal insulation layer (30). The thermal insulation layer (30) has a mass reduction rate of 10% or less in a thermogravimetric analysis in which the same is held at 500 DEG C or less for 30 minutes, and has a porous structure, reinforcing fibers, and nanoparticles of a metal oxide serving as a binder, said porous structure having a plurality of particles linked to form a skeleton therein, having fine pores in the interior thereof, and among the surface and the interior thereof, having a hydrophobic site at least on the surface. When the thermal insulation material (3) for a battery pack is subjected to a compression test in which the same is compressed under a load of 15 MPa in a thickness direction, where said thickness direction is the layering direction of the thermal insulation layer (30), the first substrate (31), and the second substrate (32), the change rate of the post-compression test thickness in relation to the pre-compression test thickness is less than 70%.

Description

technical field [0001] The present invention relates to a heat insulating material arranged between battery cells in a battery pack containing a plurality of battery cells. Background technique [0002] A battery pack containing a plurality of battery cells is mounted on a hybrid vehicle or an electric vehicle. In the battery pack, a battery module in which a plurality of battery cells are stacked is housed in a housing while being fixed by fastening members from both sides in the stacking direction. For example, Patent Document 1 describes a composite sheet interposed between adjacent battery cells. This composite sheet has a heat-insulating layer, and when the temperature of one battery cell rises, heat transfer to an adjacent battery cell is suppressed. The heat insulating layer is formed by supporting silica xerogel on a nonwoven fabric. [0003] Silica xerogel and silica aerogel are porous materials in which silica fine particles are connected to form a skeleton and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/209H01M50/222H01M50/231H01M50/24
CPCH01M50/209H01M50/24H01M50/231H01M50/222H01M10/651H01M10/658F16L59/02Y02E60/10H01M10/0525H01M10/647H01M50/204B32B2307/51
Inventor 片山直树熊谷信志林翔太田口祐太朗新宅裕二
Owner SUMITOMO RIKO CO LTD
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