Masking features for battery cells

Patent metadata

Field	Value
Publication number	US-2025007137-A1
Application number	US-202318525689-A
Country	US
Kind code	A1
Filing date	Nov 30, 2023
Priority date	Jun 30, 2023
Publication date	Jan 2, 2025
Grant date	—

Abstract

Aspects of the subject disclosure relate to various masking features for battery cells. Masking features for battery cells may include masks that are mounted to a cell cap of a battery cell, masking features extending from other electrical components to provide masking for the battery cells, and/or or a compressible internal material provided under or within the cell cap.

First claim

1 . An apparatus, comprising:
a mask configured to be mounted to an external surface of a cap of a battery cell having a current interrupt device under the cap within the battery cell, wherein the mask comprises at least one blocking structure configured to be mounted over an opening in the cap of the battery cell to prevent a liquid from flowing through the opening into a space between the cap and the current interrupt device.

2 . The apparatus of claim 1 , wherein the at least one blocking structure comprises a plurality of blocking structures configured to be mounted over a plurality of corresponding openings in the cap of the battery cell.

3 . The apparatus of claim 2 , wherein the mask further comprises a bridge structure and wherein the plurality of blocking structures extend radially from the bridge structure.

4 . The apparatus of claim 3 , wherein the plurality of blocking structures extend radially inward from the bridge structure, and are configured to tuck into the plurality of corresponding openings in the cap of the battery cell.

5 . The apparatus of claim 3 , wherein the bridge structure defines a central opening configured to be mounted over the cap of the battery cell.

6 . The apparatus of claim 3 , wherein mask further comprises a plurality of peripheral openings, wherein each of the peripheral openings is disposed between a pair of the plurality of blocking structures, and wherein each of the plurality of peripheral openings is configured to: allow a gas to flow therethrough between the opening in the cap of the battery cell and an environment external to the mask, and prevent the liquid from flowing therethrough.

7 . The apparatus of claim 1 , wherein the liquid comprises a potting material, and wherein the mask is mounted to the cap of the battery cell using a snap fit or a press fit.

8 . The apparatus of claim 1 , wherein the mask is formed from a flexible material.

9 . The apparatus of claim 8 , wherein the flexible material comprises a polymer or a rubber.

10 . The apparatus of claim 9 , wherein the mask and the battery cell are implemented in a vehicle.

11 - 20 . (canceled)

21 . A battery subassembly, comprising:
a battery cell comprising:
a cap having an opening; and
a current interrupt device under the cap; and
a mask mounted to an external surface of the cap, wherein the mask comprises at least one blocking structure configured to be mounted over the opening in the cap of the battery cell to prevent a liquid from flowing through the opening into a space between the cap and the current interrupt device.

22 . The battery subassembly of claim 21 , wherein the opening in the cap is arranged to allow a gas to flow out of the battery cell via the current interrupt device when the current interrupt device is triggered.

23 . The battery subassembly of claim 21 , wherein the liquid comprises a potting material, and wherein the battery subassembly further comprises the potting material in contact with an outer surface of the mask.

24 . The battery subassembly of claim 21 , wherein the at least one blocking structure comprises a plurality of blocking structures configured to be mounted over a plurality of corresponding openings in the cap of the battery cell.

25 . The battery subassembly of claim 21 , wherein the mask further comprises a bridge structure and a plurality of blocking structures that extend radially from the bridge structure, and wherein the plurality of blocking structures are tucked into the plurality of corresponding openings in the cap of the battery cell.

26 . A method, comprising:
obtaining a battery cell having a cap with at least one opening and a current interrupt device under the cap; obtaining a mask having at least one blocking structure; and mounting the mask to an external surface of the cap of the battery cell such that the at least one blocking structure is mounted at least partially over the at least one opening to prevent a liquid from flowing through the opening into a space between the cap and the current interrupt device.

27 . The method of claim 26 , wherein mounting the mask comprises adhesively attaching the mask to the external surface of the cap of the battery cell.

28 . The method of claim 26 , wherein mounting the mask comprises attaching the mask to the battery cell using a snap fit or a press fit.

29 . The method of claim 26 , wherein mounting the mask comprises tucking at least a portion of the blocking structure into the at least one opening in the cap.

30 . The method of claim 26 , wherein the liquid comprises a potting material, the method further comprising:
providing the potting material onto the battery cell with the mask mounted thereon; and preventing, by the mask, the potting material from flowing through the opening into the space between the cap and the current interrupt device.

Assignees

• Rivian Ip Holdings Llc

Inventors

• Murkute Akshay Kishor
• Campbell Andrew Richard
• Bloxham Thomas
• Wong Kin-Seng
• Marker Nick

Classifications

• H01M50/588

  outside the batteries, e.g. incorrect connections of terminals or busbars · CPC title

• H01M50/593

  Spacers; Insulating plates · CPC title

• H01M50/583

  in response to current, e.g. fuses · CPC title

• H01M50/503

  characterised by the shape of the interconnectors · CPC title

• H01M50/507

  comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules · CPC title