US-20260128457-A1 - TRACTION BATTERY PACK VENTING SYSTEM WITH COATED AREA SHIELD

Abstract

A traction battery pack venting system includes one or more battery cells and a venting chamber adjacent the one or more battery cells. The one or more battery cells are configured to vent to the venting chamber. The venting chamber has an inner wall and an outer wall. The outer wall can include outer wall vent openings. Each of the outer wall vent openings is configured to receive vent byproducts discharged from one of the one or more battery cells. The inner wall can include inner wall inlets each configured to receive vent byproducts discharged from one of the one or more battery cells.

Inventors

• Xiaogang Zhang

Assignees

• FORD GLOBAL TECHNOLOGIES, LLC

Dates

Publication Date

20260507

Application Date

20241104

Claims (20)

1. 1 . A traction battery pack venting system, comprising: one or more battery cells; and a venting chamber adjacent the one or more battery cells, the one or more battery cells configured to vent to the venting chamber, the venting chamber having an inner wall and an outer wall.
2. 2 . The venting system of claim 1 , wherein the outer wall includes a plurality of outer wall vent openings, each of the outer wall vent openings is configured to receive vent byproducts discharged from one of the one or more battery cells, wherein the inner wall includes a plurality of inner wall inlets each configured to receive vent byproducts discharged from one of the one or more battery cells.
3. 3 . The venting system of claim 1 , wherein the one or more battery cells are immersion cooled.
4. 4 . The venting system of claim 1 , wherein the one or more battery cells are cylindrical battery cells.
5. 5 . The venting system of claim 1 , wherein the outer wall is at least partially electrocoated.
6. 6 . The venting system of claim 1 , wherein at least the outer wall is a coated metal or a coated metal alloy.
7. 7 . The venting system of claim 1 , wherein the venting chamber is sealed from a cell chamber that encloses the one or more battery cells such that liquid communicated through the cell chamber as part of an immersion thermal management system is blocked from entering the venting chamber.
8. 8 . The venting system of claim 1 , wherein the inner wall is a folded sheet of material.
9. 9 . The venting system of claim 1 , wherein the inner wall is angled relative to the outer wall to provide gaps between the inner wall and the outer wall.
10. 10 . The venting system of claim 1 , wherein the inner wall has an inner wall floor that is adjacent an outer wall floor of the outer wall, the inner wall floor tilted relative to the outer wall floor to provide an air gap between the inner wall floor and the outer wall floor.
11. 11 . The venting system of claim 10 , wherein the air gap has a triangular profile.
12. 12 . The venting system of claim 1 , wherein the inner wall has a wave-shaped profile.
13. 13 . The venting system of claim 1 , wherein the inner wall is disposed within the venting chamber opposite an outer wall vent opening that receives vent byproducts from one or more of the one or more battery cells, the outer wall vent opening in the outer wall.
14. 14 . The venting system of claim 1 , wherein vent byproducts are contained with the venting chamber by the inner wall on a bottom side, by the outer wall on opposing horizontally facing sides, and by the outer wall on a top side.
15. 15 . The venting system of claim 1 , wherein the inner wall overlaps exclusively a floor of the outer wall.
16. 16 . A traction battery pack venting system, comprising: an enclosure assembly having an enclosure interior; a divider within the enclosure interior, the divider separating a cell chamber of the enclosure interior from one or more venting chambers of the enclosure interior; a thermal management system having a liquid, the thermal management system configured to circulate the liquid through the cell chamber; and one or more battery cells disposed within the cell chamber, the one or more battery cells configured to vent into the one or more venting chambers, the one or more venting chambers each having an inner wall and an outer wall.
17. 17 . The venting system of claim 16 , wherein the outer wall includes a plurality of outer wall vent openings each configured to receive vent byproducts discharged from one of the one or more battery cells, wherein the inner wall includes a plurality of inner wall inlets each configured to receive vent byproducts discharged from one of the one or more battery cells.
18. 18 . The venting system of claim 16 , wherein the thermal management system circulates the liquid through the cell chamber without the liquid passing through the one or more venting chambers.
19. 19 . The venting system of claim 16 , wherein the inner wall is angled relative to the outer wall to provide gaps between the inner wall and the outer wall.
20. 20 . The venting system of claim 16 , wherein at least the outer wall is a coated metal or a coated metal alloy.

Description

TECHNICAL FIELD This disclosure relates generally to a venting system for a battery pack and, more particularly, to a venting system for a battery pack that can shield coated areas of the battery pack from vent byproducts. BACKGROUND Electrified vehicles differ from conventional motor vehicles because electrified vehicles can be selectively driven by one or more electric machines that are powered by a traction battery pack. The electric machines can propel the electrified vehicles instead of, or in combination with, an internal combustion engine. The traction battery pack is discharged when powering the one or more electric machines and other loads of the electrified vehicle. SUMMARY In some aspects, the techniques described herein relate to a traction battery pack venting system, including: one or more battery cells; and a venting chamber adjacent the one or more battery cells, the one or more battery cells configured to vent to the venting chamber, the venting chamber having an inner wall and an outer wall. In some aspects, the techniques described herein relate to a venting system, wherein the outer wall includes a plurality of outer wall vent openings, each of the outer wall vent openings is configured to receive vent byproducts discharged from one of the one or more battery cells, wherein the inner wall includes a plurality of inner wall inlets each configured to receive vent byproducts discharged from one of the one or more battery cells. In some aspects, the techniques described herein relate to a venting system, wherein the one or more battery cells are immersion cooled. In some aspects, the techniques described herein relate to a venting system, wherein the one or more battery cells are cylindrical battery cells. In some aspects, the techniques described herein relate to a venting system, wherein the outer wall is at least partially electrocoated. In some aspects, the techniques described herein relate to a venting system, wherein at least the outer wall is a coated metal or a coated metal alloy. In some aspects, the techniques described herein relate to a venting system, wherein the venting chamber is sealed from a cell chamber that encloses the one or more battery cells such that liquid communicated through the cell chamber as part of an immersion thermal management system is blocked from entering the venting chamber. In some aspects, the techniques described herein relate to a venting system, wherein the inner wall is a folded sheet of material. In some aspects, the techniques described herein relate to a venting system, wherein the inner wall is angled relative to the outer wall to provide gaps between the inner wall and the outer wall. In some aspects, the techniques described herein relate to a venting system, wherein the inner wall has an inner wall floor that is adjacent an outer wall floor of the outer wall, the inner wall floor tilted relative to the outer wall floor to provide an air gap between the inner wall floor and the outer wall floor. In some aspects, the techniques described herein relate to a venting system, wherein the air gap has a triangular profile. In some aspects, the techniques described herein relate to a venting system, wherein the inner wall has a wave-shaped profile. In some aspects, the techniques described herein relate to a venting system, wherein the inner wall is disposed within the venting chamber opposite an outer wall vent opening that receives vent byproducts from one or more of the one or more battery cells, the outer wall vent opening in the outer wall. In some aspects, the techniques described herein relate to a venting system, wherein vent byproducts are contained with the venting chamber by the inner wall on a bottom side, by the outer wall on opposing horizontally facing sides, and by the outer wall on a top side. In some aspects, the techniques described herein relate to a venting system, wherein the inner wall overlaps exclusively a floor of the outer wall. In some aspects, the techniques described herein relate to a traction battery pack venting system, including: an enclosure assembly having an enclosure interior; a divider within the enclosure interior, the divider separating a cell chamber of the enclosure interior from one or more venting chambers of the enclosure interior; a thermal management system having a liquid, the thermal management system configured to circulate the liquid through the cell chamber; and one or more battery cells disposed within the cell chamber, the one or more battery cells configured to vent into the one or more venting chambers, the one or more venting chambers each having an inner wall and an outer wall. In some aspects, the techniques described herein relate to a venting system, wherein the outer wall includes a plurality of outer wall vent openings each configured to receive vent byproducts discharged from one of the one or more battery cells, wherein the inner wall includes a plurality of inner wall inlets each con