GORE® Battery Vents – MultiVent Series
Integrated protection for EV battery venting systems, combining thermal-runaway evacuation, moisture protection and pressure equalization in one vent.
Simplify EV Venting with One Integrated Battery Vent Solution
Battery pack engineers must manage thermal-runaway evacuation, moisture protection and pressure equalization while limiting added components and pack openings. Separate vents, valves, desiccants and other hardware can increase design, sealing and testing complexity. The GORE® Battery Vents – MultiVent Series is an integrated battery vent that combines all three functions in one device and one opening. This 3-in-1 approach helps simplify venting design while supporting battery pack reliability.
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One EV Battery Venting System: Three Functions. One Vent.
Effective battery venting has to protect against three competing demands at once: evacuating thermal-runaway gases, limiting moisture ingress and equalizing pressure. It must do this without adding complexity or more pack openings. Here’s how GORE MultiVent handles each.
How fast does GORE MultiVent evacuate gas during thermal runaway?
GORE MultiVent opens at 50 mbar and delivers 50 L/s of airflow at 180 mbar, then reseals after the event.
How does GORE MultiVent help prevent moisture ingress in a battery pack?
GORE MultiVent reduces risk of condensation by limiting moisture ingress to less than 20 mg/day at 22°C and 50% rH, roughly 10 times lower than currently available dual vents under the same laboratory conditions.* This is realized by the unique Protection Zone.
How does GORE MultiVent help equalize pressure in a battery pack?
During normal operation, GORE MultiVent provides 1,200 L/hr of underpressure equalization airflow at –100 mbar. The overpressure function exceed this value by far. That is more than three times the airflow of the best alternative and up to six times that of other options.*
* Comparative performance is based on Gore testing against available alternative venting options.
What battery pack is GORE MultiVent designed for?
GORE MultiVent is designed for lithium-ion battery packs used in battery electric vehicles (BEV) and plug-in hybrid electric vehicles (PHEV) as well as heavy duty equipment and battery energy storage systems (BESS). Its integrated venting architecture is intended for larger packs that need to manage thermal-runaway evacuation, moisture protection and pressure equalization within a single system.
How does GORE MultiVent work across different pressure conditions?
As pressure conditions change, GORE MultiVent vent moves through distinct operating states: sealed during normal conditions, progressively opening for pressure equalization and fully opening for thermal-runaway evacuation.
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Technical Information
What are the key performance characteristics* for GORE MultiVent?
| Preliminary Product Performance Characteristics* | Value |
|---|---|
Overpressure equalization airflow in normal use | 16 L/s @ +100 mbar |
Underpressure equalization airflow in normal use | 1,200 L/hr @ –100 mbar |
Thermal runaway evacuation airflow | 50 L/s @ 180 mbar |
Thermal runaway opening pressure | 50 mbar |
Resealable after a thermal runaway event? | Yes |
Pressure range with no airflow (Protection Zone) | –30 mbar < system closed < 50 mbar |
Moisture ingress | <20 mg/day** |
Ingress protection | IPX7, IPX8, IPX9K |
Temperature resistance in normal use | –40°C to 90°C |
Short temperature resistance | 500°C |
Part dimensions | 77 × 55 × 22.5 mm |
Integration method | 3 × M5 hexagon socket button head screws |
*Final datasheet and specifications will be available upon completion of the full end design validation.
**Moisture ingress value is stated for laboratory conditions at 22°C and 50% rH.
How will GORE MultiVent be validated for automotive use?
Quality & Automotive Standards
- Quality management system certified to ISO 9001
- Automotive quality management system certified to IATF 16949
- PPAP available / supported
- Validation protocol based on LV 124
Material & Regulatory Compliance
- GADSL requirements
- Material reporting via IMDS
- REACH and RoHS compliance
Product Performance
- Flammability classification: UL 94 V-0
The validation package will include functional, ingress, durability and heat-exposure testing, including retesting after accelerated thermal aging.
FAQs
The number depends on the airflow and venting functions the pack must support, not on pack size alone. Higher airflow per vent can reduce the number of vent positions required. GORE MultiVent combines pressure equalization, moisture protection and thermal-runaway evacuation in one opening, with 1,200 L/h underpressure airflow at –100 mbar.
Venting inherently involves a trade-off with moisture ingress. In automotive Li-ion batteries, liquid cooling can make moisture management more challenging. MultiVent is designed to minimize moisture ingress through its special designed protection zone, while assuring a reliable pack pressure equalization. GORE MultiVent limits moisture ingress to less than 20 mbg/day at 22°C and 50% RH, while providing pressure equalization and thermal-runaway gas evacuation.
Gas released during thermal runaway can cause battery pack pressure to rise rapidly, increasing loads on seals and enclosure structures. Opening pressure and evacuation airflow both affect how quickly that pressure can be relieved. GORE MultiVent opens at 50 mbar and provides 50 L/s of airflow at 180 mbar.
Some battery pack vents are designed to reseal after pressure falls, while one-time relief devices remain open after activation. Resealing can help re-establish enclosure sealing after gas evacuation. GORE MultiVent provides high-flow thermal-runaway evacuation at 50 L/s and 180 mbar, then the system is designed to reseal after the TR event.
Moisture vapor transmission rate (MVTR) measures how much water vapor passes through a vent over time, under stated temperature and humidity conditions. Lower MVTR helps limit moisture entering the battery pack. GORE MultiVent has a moisture ingress rate of less than 20 mg/day at 22°C and 50% rH.
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FOR INDUSTRIAL USE ONLY
Not for use in food, drug, cosmetic or medical device manufacturing, processing, or packaging operations.
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