CN-122000550-A - Thermal insulation sheet for rechargeable lithium battery and rechargeable lithium battery module including the same

Abstract

The present application relates to a thermal insulation sheet for a rechargeable lithium battery and a rechargeable lithium battery module including the same. The thermal insulation sheet includes a substrate sheet including a first substrate layer, an aerogel-containing layer, and a second substrate layer laminated in this order, and a coating layer surrounding the substrate sheet, and each of the first substrate layer and the second substrate layer includes one selected from the group consisting of 70 grams per square meter (gsm) to 500 grams per square meter (gsm) of glass fiber sheet, and 50 gsm to 300 gsm of carbon fiber sheet, each of the first substrate layer and the second substrate layer has a thickness of 300 μm to 5,000 μm, the aerogel-containing layer has a thickness of 300 μm to 5,000 μm, and the aerogel is included in the aerogel-containing layer in an amount of 10 wt% to 90 wt%.

Inventors

• LI ZHENGXIAO
• YU MINGXI
• LIANG CHENGLONG
• PU HUIZHEN
• LI ZAIXUAN
• Luo Hena
• LI KANGYUAN
• LIANG YUNCHENG

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20251031

Priority Date

20241101

Claims (9)

1. 1. A thermal insulating sheet for a rechargeable lithium battery, the thermal insulating sheet comprising: a substrate sheet comprising a first substrate layer, an aerogel-containing layer and a second substrate layer laminated in this order, 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 70gsm to 500gsm glass fiber sheets, and 50 gsm to 300 gsm carbon fiber sheets, Each of the first substrate layer and the second substrate layer has a thickness of 300 μm to 5,000 μm, The aerogel-containing layer has a thickness of 300 μm to 5,000 μm, and Aerogel is included in the aerogel-containing layer in an amount of 10 wt% to 90 wt%.
2. 2. The thermal insulation sheet of claim 1, wherein the aerogel-containing layer is a discontinuous layer separate from the first substrate layer.
3. 3. The thermal insulation sheet of claim 1, wherein the aerogel-containing layer is a discontinuous layer separate from the second substrate layer.
4. 4. The thermal insulating sheet according to claim 1, wherein the coating layer comprises a first coating layer on the upper and lower surfaces of the substrate sheet, and a second coating layer on the side surfaces of the substrate sheet, and The first coating layer and the second coating layer are made of the same or different inorganic layers.
5. 5. The thermal insulation sheet according to claim 4, wherein each of the first coating layer and the second coating layer has a thickness of 1 μm to 500 μm.
6. 6. The thermal insulating sheet according to claim 4, wherein the inorganic layer in the first coating layer and the second coating layer is a layer including at least one of silicon oxide and aluminum oxide.
7. 7. The thermal insulation sheet according to claim 4, wherein the inorganic layer further comprises a binder.
8. 8. The thermal insulation sheet according to claim 7, wherein the binder comprises at least one of polyvinyl alcohol, polyethylene glycol, polyacrylamide, polyvinylpyrrolidone, polyurethane, and polyester.
9. 9. A rechargeable lithium battery module, comprising: a plurality of battery cells arranged to face each other, and The thermal insulation sheet for a rechargeable lithium battery of any one of claims 1 to 8, disposed between adjacent battery cells of the plurality of battery cells.

Description

Thermal insulation sheet for rechargeable lithium battery and rechargeable lithium battery module including the same Cross Reference to Related Applications The present application claims priority and benefit from korean patent application No. 10-2024-0153536 filed in the korean intellectual property office on 1/11/2024, the entire disclosure of which is incorporated herein by reference. Technical Field Aspects of embodiments of the present invention relate to a thermal insulation sheet for a rechargeable lithium battery and a rechargeable lithium battery module including the same. Background In recent years, with the rapid popularization of electronic devices (such as mobile phones, laptop computers, electric vehicles, etc.) using batteries, the demand for secondary batteries having high energy density and high capacity has rapidly increased. Accordingly, research and development for improving the performance of rechargeable lithium batteries are actively underway. A rechargeable lithium battery is a battery including a positive electrode and a negative electrode (the positive electrode and the negative electrode include active materials capable of intercalating and deintercalating lithium ions) and an electrolyte, and generates electric energy through oxidation and reduction reactions when lithium ions are intercalated/deintercalated between the positive electrode and the negative electrode. A plurality of rechargeable lithium batteries may be included to form a rechargeable lithium battery module. In rechargeable lithium battery modules, it may be desirable to block heat propagation and/or heat transfer between adjacent battery cells. Disclosure of Invention According to aspects of embodiments of the present invention, there is provided a thermal insulation sheet for a rechargeable lithium battery having excellent thermal insulation characteristics, flexibility, compressibility, dust resistance, heat resistance, and durability. According to another aspect of embodiments of the present invention, there is provided a rechargeable lithium battery module including the above-described thermal insulation sheet for a rechargeable lithium battery. According to one or more embodiments, a thermal insulation sheet for a rechargeable lithium battery includes a substrate sheet including a first substrate layer, an aerogel-containing layer, and a second substrate layer laminated in this order, and a coating layer surrounding the substrate sheet, wherein each of the first substrate layer and the second substrate layer includes one selected from the group consisting of 70 grams per square meter (gsm) to 500 grams per square meter (gsm) of glass fiber sheet, and 50 gsm to 300 gsm of carbon fiber sheet, and each of the first substrate layer and the second substrate layer has a thickness of 300 μm to 5,000 μm, the aerogel-containing layer has a thickness of 300 μm to 3,000 μm, and the aerogel is included in the aerogel-containing layer in an amount of 10 wt% to 90 wt%. According to one or more embodiments, a rechargeable lithium battery module includes a plurality of battery cells arranged to face each other, and a thermal insulation sheet for a rechargeable lithium battery arranged between adjacent battery cells of the plurality of battery cells. The thermal insulation sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent thermal insulation characteristics, and thus may inhibit heat propagation and/or heat transfer within the rechargeable lithium battery module, thereby improving the safety of the rechargeable lithium battery module. The thermal insulation sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent flexibility and compressibility, thereby improving manufacturing processability of the thermal insulation sheet and the rechargeable lithium battery module. The thermal insulation sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent dust resistance, thereby improving manufacturing processability of the thermal insulation sheet and the rechargeable lithium battery module. The thermal insulation sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent heat resistance and durability, thereby improving the life of the rechargeable lithium battery module. Drawings Fig. 1 is a sectional view of a thermal insulation sheet for a rechargeable lithium battery according to an embodiment. Fig. 2 is a perspective view of a rechargeable lithium battery module according to an embodiment. Fig. 3 is an exploded perspective view of the rechargeable lithium battery module of fig. 2. Fig. 4 is a sectional view schematically illustrating a battery cell according to an embodiment. Fig. 5 is a perspective view schematically illustrating a battery pack according to an embodiment. Fig. 6 is a perspective view schematically illustrating a battery pack according to