Laser patterned separator

Patent metadata

Field	Value
Publication number	US-2024154248-A1
Application number	US-202217983789-A
Country	US
Kind code	A1
Filing date	Nov 9, 2022
Priority date	Nov 9, 2022
Publication date	May 9, 2024
Grant date	—

Abstract

Provided are separators for a battery cell comprising a polymer layer having a laser-patterned surface and a ceramic layer. The separators can further include a base layer, and the layers of the separator are provided in the following order: base layer, ceramic layer, and polymer layer. The laser-etching of the polymer layer does not modify the other layers of the separator.

First claim

1 . A separator for a battery cell comprising:
a polymer layer having a laser-patterned surface; and a ceramic layer.

2 . The separator of claim 1 , wherein the polymer layer comprises: a fluoropolymer, polyvinylidene fluoride, poly(methyl methacrylate), polyvinylidene fluoride-hexafluoropropene copolymer, or a combination thereof.

3 . The separator of claim 1 , wherein the ceramic layer comprises alumina.

4 . The separator of claim 1 , wherein the polymer layer overlies the ceramic layer and only partially coats the ceramic layer.

5 . The separator of claim 1 , comprising a base layer.

6 . The separator of claim 5 , wherein the ceramic layer overlies the base layer.

7 . The separator of claim 1 , wherein a pattern of the laser-patterned surface of the separator is formed only on the polymer layer.

8 . The separator of claim 1 , wherein a pattern of the laser-patterned surface of the separator is not formed on the base layer or the ceramic layer.

9 . The separator of claim 1 , wherein the laser-patterned surface is formed using a pulse laser.

10 . The separator of claim 1 , wherein a pattern of the laser-patterned surface comprises a plurality of parallel lines.

11 . The separator of claim 10 , wherein a depth of each parallel line of the plurality of parallel lines is 2-3 μm.

12 . The separator of claim 10 , wherein a width of each parallel line of the plurality of parallel lines is 5 μm to 0.2 mm.

13 . The separator of claim 1 , wherein a pattern of the laser-patterned surface comprises a plurality of dots.

14 . The separator of claim 13 , wherein each dot of the plurality of dots has a radius of 5 μm to 0.2 mm.

15 . The separator of claim 13 , wherein each dot of the plurality of dots has a depth of each parallel line of the plurality of parallel lines is 2-3 μm.

16 . The separator of claim 1 , wherein a pattern of the laser-patterned surface comprises a spiral pattern.

17 . The separator of claim 16 , wherein the spiral pattern comprises a spiral line having a width of 5 μm to 0.2 mm.

18 . The separator of claim 16 , wherein the spiral pattern comprises a spiral line having a depth of 2-3 μm.

19 . A rechargeable lithium-ion battery comprising:
a separator for a battery cell comprising: a polymer layer having a laser-patterned surface; and a ceramic layer.

20 . An electric vehicle system comprising the rechargeable lithium-ion battery of claim 16 .

Assignees

• Rivian Ip Holdings Llc

Inventors

• Zhai Meiyu
• Yang Ruidong
• Kompella Christopher Surya

Classifications

• H01M50/434 Primary

  Ceramics · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title