US-20260128420-A1 - HEAT INSULATING SHEET FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY MODULE INCLUDING THE SAME

Abstract

A heat insulating sheet for a rechargeable lithium battery and a rechargeable lithium battery module are disclosed. A heat insulating sheet includes a substrate sheet including a first substrate layer, an aerogel-containing layer, and a second substrate layer, which are sequentially laminated; 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 a glass fiber sheet having a weight of 70 to 500 grams per square meter (gsm); and a carbon fiber sheet having a weight of 50 to 300 gsm, 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 an amount of 10 to 90% by weight in the aerogel-containing layer.

Inventors

• Jung Hyo Lee
• Myung Heui Woo
• Seung Yong Yang
• Hye Jin Park
• Jae Hyun Lee
• Ha Na RA
• Kang Won LEE
• Yun Sung Yang

Assignees

• SAMSUNG SDI CO., LTD.

Dates

Publication Date

20260507

Application Date

20251031

Priority Date

20241101

Claims (16)

1. 1 . A heat insulating sheet for a rechargeable lithium battery, the heat insulating sheet comprising: a substrate sheet comprising a first substrate layer, an aerogel-containing layer, and a second substrate layer, which are sequentially laminated; 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 having a weight of 70 to 500 grams per square meter (gsm); and a carbon fiber sheet having a weight of 50 to 300 gsm, 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 an amount of 10 to 90% by weight in the aerogel-containing layer.
2. 2 . The heat insulating sheet as claimed in claim 1 , wherein the aerogel-containing layer is a non-continuous layer that is separate from the first substrate layer.
3. 3 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 2 arranged between battery cells of the plurality of battery cells.
4. 4 . The heat insulating sheet as claimed in claim 1 , wherein the aerogel-containing layer is a non-continuous layer that is separate from the second substrate layer.
5. 5 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 4 arranged between battery cells of the plurality of battery cells.
6. 6 . The heat insulating sheet as claimed in claim 1 , wherein the coating layer comprises a first coating layer on an upper surface and a lower surface of the substrate sheet; and a second coating layer on a side surface of the substrate sheet, and the first coating layer and the second coating layer are made of different inorganic layers.
7. 7 . The heat insulating sheet as claimed in claim 6 , wherein each of the first coating layer and the second coating layer has a thickness of 1 μm to 500 μm.
8. 8 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 7 arranged between battery cells of the plurality of battery cells.
9. 9 . The heat insulating sheet as claimed in claim 6 , wherein the inorganic layers in the first coating layer and the second coating layer are layers comprising at least one of silicon oxide and aluminum oxide.
10. 10 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 9 arranged between battery cells of the plurality of battery cells.
11. 11 . The heat insulating sheet as claimed in claim 6 , wherein the inorganic layer further comprises a binder.
12. 12 . The heat insulating sheet as claimed in claim 11 , wherein the binder comprises at least one of polyvinyl alcohol, polyethylene glycol, polyacrylamide, polyvinyl pyrrolidone, polyurethane, and polyester.
13. 13 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 12 arranged between battery cells of the plurality of battery cells.
14. 14 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 11 arranged between battery cells of the plurality of battery cells.
15. 15 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 6 arranged between battery cells of the plurality of battery cells.
16. 16 . A rechargeable lithium battery module comprising: a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery of claim 1 arranged between battery cells of the plurality of battery cells.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application claims priority to and the benefit of Korean Patent Application No. 10-2024-0153536, filed on Nov. 1, 2024 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. BACKGROUND 1. Field Aspects of embodiments of the present invention relate to a heat insulating sheet for a rechargeable lithium battery and a rechargeable lithium battery module including the same. 2. Description of the Related Art In recent years, with the rapid spread of electronic devices using batteries, such as mobile phones, laptop computers, electric vehicles, and the like, the demand for secondary batteries with high energy density and high capacity has rapidly increased. Accordingly, research and development for improving the performance of rechargeable lithium batteries is actively underway. A rechargeable lithium battery is a battery that includes positive and negative electrodes that include active materials capable of intercalation and deintercalation of lithium ions, and an electrolyte, and produces electrical energy through oxidation and reduction reactions when the lithium ions are intercalated/deintercalated into/from the positive and negative electrodes. A plurality of rechargeable lithium batteries may be included to form a rechargeable lithium battery module. In the rechargeable lithium battery module, it may be desirable to block heat propagation and/or heat transfer between adjacent cells. SUMMARY According to an aspect of embodiments of the present invention, a heat insulating sheet for a rechargeable lithium battery having excellent heat insulating properties, flexibility, compressibility, dust resistance, heat resistance, and durability is provided. According to another aspect of embodiments of the present invention, a rechargeable lithium battery module including the above-described heat insulating sheet for a rechargeable lithium battery is provided. According to one or more embodiments, a heat insulating sheet for a rechargeable lithium battery includes a substrate sheet including a first substrate layer, an aerogel-containing layer, and a second substrate layer, which are sequentially laminated; 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 a glass fiber sheet having a weight of 70 to 500 grams per square meter (gsm); and a carbon fiber sheet having a weight of 50 to 300 gsm, 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 an amount of 10 to 90% by weight in the aerogel-containing layer. According to one or more embodiments, a rechargeable lithium battery module includes a plurality of battery cells arranged to face each other; and the heat insulating sheet for a rechargeable lithium battery disposed between the plurality of battery cells. The heat insulating sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent insulating properties, and thus may suppress heat propagation and/or heat transfer within the module, thereby improving the safety of a module. The heat insulating sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent flexibility and compressibility, thereby improving the manufacturing processibility of the heat insulating sheet and the battery module. The heat insulating sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent dust resistance, thereby improving the manufacturing processibility of the heat insulating sheet and the battery module. The heat insulating sheet for a rechargeable lithium battery according to one or more embodiments may provide excellent heat resistance and durability, thereby improving a lifespan of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a heat insulating 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 cross-sectional view schematically showing a battery cell according to an embodiment. FIG. 5 is a perspective view schematically showing a battery pack according to an embodiment. FIG. 6 is a perspective view schematically showing a battery pack according to an embodiment. FIG. 7 is a drawing showing a car body and car body parts according to an embodiment. FIG. 8 is a drawing showing a car body and car body parts according to an embodiment. DETAILED DESCRIPTION Herein, some embodiments of the present invention will be described in further detail. However, it is to be understood th