KR-20260065294-A - HEAT INSULATING SHEET FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY MODULE INCLUDING THE SAME

Abstract

The invention relates to an insulating sheet for a lithium secondary battery and a lithium secondary battery module including the same, wherein the insulating sheet for a lithium secondary battery comprises a substrate sheet including a first substrate layer, an aerogel-containing layer, and a second substrate layer sequentially stacked; and a coating layer surrounding the substrate sheet, wherein each of the first substrate layer and the second substrate layer comprises one selected from the group consisting of a glass fiber sheet of 70 to 500 gsm (gram per square meter); and a carbon fiber sheet of 50 to 300 gsm (gram per square meter), wherein each of the first substrate layer and the second substrate layer has a thickness of 300 μm to 5000 μm, and the thickness of the aerogel-containing layer is 300 μm to 5000 μm, and the aerogel in the aerogel-containing layer is included in an amount of 10 to 90 weight%.

Inventors

• 이정효
• 우명희
• 양승용
• 박혜진
• 이재현
• 라하나
• 이강원
• 양윤성

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260508

Application Date

20241101

Claims (9)

1. A substrate sheet comprising a first substrate layer, an aerogel-containing layer, and a second substrate layer stacked sequentially; and It includes a coating layer surrounding the above-mentioned sheet, and Each of the first substrate layer and the second substrate layer comprises one selected from the group consisting of a glass fiber sheet of 70 to 500 gsm (grams per square meter) and a carbon fiber sheet of 50 to 300 gsm (grams per square meter). Each of the first substrate layer and the second substrate layer has a thickness of 300㎛ to 5000㎛, and The thickness of the above aerogel-containing layer is 300㎛ to 5000㎛, and The aerogel in the above aerogel-containing layer is included in an amount of 10 to 90 weight%, Insulation sheet for lithium secondary batteries.
2. In claim 1, the thermal insulation sheet for a lithium secondary battery, wherein the aerogel-containing layer is a discontinuous layer relative to the first substrate layer.
3. In claim 1, the thermal insulation sheet for a lithium secondary battery, wherein the aerogel-containing layer is a discontinuous layer relative to the second substrate layer.
4. In claim 1, the coating layer comprises a first coating layer formed on the upper and lower surfaces of the substrate sheet; and a second coating layer formed on the side of the substrate sheet. The first coating layer and the second coating layer are composed of different inorganic layers. Insulation sheet for lithium secondary batteries.
5. In claim 4, the first coating layer and the second coating layer each have a thickness of 1 μm to 500 μm, forming an insulating sheet for a lithium secondary battery.
6. In claim 4, the inorganic layer of the first coating layer and the second coating layer is a layer comprising one or more of silicon oxide and aluminum oxide, an insulating sheet for a lithium secondary battery.
7. In paragraph 4, the above-mentioned inorganic layer further comprises a binder, forming an insulating sheet for a lithium secondary battery.
8. In claim 7, the above binder comprises one or more of polyvinyl alcohol, polyethylene glycol, polyacrylamide, polyvinylpyrrolidone, polyurethane, and polyester, forming an insulating sheet for a lithium secondary battery.
9. A lithium secondary battery module comprising: a plurality of battery cells arranged to face each other; and an insulating sheet for a lithium secondary battery according to any one of claims 1 to 8 disposed between the plurality of battery cells.

Description

Heat Insulating Sheet for Rechargeable Lithium Battery and Rechargeable Lithium Battery Module Including the Same The invention relates to an insulating sheet for a lithium secondary battery and a lithium secondary battery module including the same. Recently, accompanied by the rapid proliferation of battery-powered electronic devices such as mobile phones, laptop computers, and electric vehicles, the demand for high-energy-density, high-capacity rechargeable batteries is rapidly increasing. Accordingly, research and development to improve the performance of lithium-ion batteries is actively underway. A lithium secondary battery is a battery comprising a positive electrode and a negative electrode containing an active material capable of lithium ion intercalation and deintercalation, and an electrolyte, which produces electrical energy through oxidation and reduction reactions when lithium ions are intercalated or deintercalated from the positive and negative electrodes. Multiple lithium secondary batteries can be included to form a lithium secondary battery module. In a lithium secondary battery module, it may be desirable to block heat propagation and/or heat transfer between adjacent cells. FIG. 1 is a cross-sectional view of an insulating sheet for a lithium secondary battery according to one embodiment. FIG. 2 is a perspective view of a lithium secondary battery module according to one embodiment. FIG. 3 is an exploded perspective view of a lithium secondary battery module according to one embodiment. FIG. 4 is a cross-sectional view schematically showing a battery cell according to one embodiment. FIG. 5 is a cross-sectional view schematically showing a battery pack according to one embodiment. FIG. 6 is a cross-sectional view schematically showing a battery pack according to one embodiment. FIG. 7 is a drawing illustrating a vehicle body and vehicle body parts according to one embodiment. FIG. 8 is a drawing illustrating a vehicle body and vehicle body parts according to one embodiment. Hereinafter, embodiments of the present invention will be described in detail. However, these are presented as examples and are not intended to limit the present invention, and the present invention is defined only by the scope of the claims set forth below. Unless otherwise specifically stated in this specification, when a part such as a layer, film, region, plate, etc. is described as being "on" another part, this includes not only cases where it is "immediately on" another part, but also cases where there is another part in between. Unless otherwise specified in this specification, a singular form may also include a plural form. Additionally, unless otherwise specified, "A or B" may mean "including A, including B, or including A and B." In this specification, "combination of these" may mean a mixture of components, a laminate, a composite, a copolymer, an alloy, a blend, and a reaction product, etc. [Insulation Sheet for Lithium Secondary Batteries] An insulating sheet for a lithium secondary battery according to one embodiment comprises a substrate sheet including a first substrate layer, an aerogel-containing layer, and a second substrate layer sequentially stacked; and a coating layer surrounding the substrate sheet, wherein each of the first substrate layer and the second substrate layer comprises one selected from the group consisting of a glass fiber sheet of 70 to 500 gsm (grams per square meter); and a carbon fiber sheet of 50 to 300 gsm (grams per square meter), wherein each of the first substrate layer and the second substrate layer has a thickness of 300 μm to 5000 μm, the thickness of the aerogel-containing layer is 300 μm to 5000 μm, and the aerogel in the aerogel-containing layer is included in an amount of 10 to 90 weight%. By including the aerogel-containing layer and the substrate layer, the insulating sheet can provide excellent thermal insulation, dust resistance, heat resistance, and durability. Both the aerogel-containing layer and the substrate layer can contribute to improving the thermal insulation, dust resistance, heat resistance, and durability of the insulation sheet. Hereinafter, an insulating sheet according to one embodiment is described in detail. Entry sheet The substrate sheet includes a first substrate layer, an aerogel-containing layer, and a second substrate layer that are sequentially laminated. First layer of material The first substrate layer supports the aerogel-containing layer and the second substrate layer among the insulation sheets. The first substrate layer above may include one or more layers of the insulation sheet, i.e., one or two or more layers. The first substrate layer comprises one type selected from the group consisting of a glass fiber sheet of 70 to 500 gsm (gram per square meter), for example, 80 to 200 gsm, 90 to 120 gsm; and a carbon fiber sheet of 50 to 300 gsm (gram per square meter), for example, 50 to 200 gsm, 70 to 150 gsm. The above glass fiber shee