How to Handle Battery Thermal Runaway? PUW Rapid Pressure Relief Vent Valve Provides Reliable Safety Protection

As the adoption of new energy vehicles rapidly increases in China, safety concerns surrounding battery systems are becoming more prominent. In situations such as overcharging or collisions, power lithium batteries can easily emit smoke, catch fire, or even explode—most of which are triggered by a phenomenon known as thermal runaway.

What Causes Thermal Runaway?

Thermal runaway is a chain reaction typically caused by:

• Mechanical and electrical triggers such as crushing, piercing, or impact to the battery;

• Electrochemical triggers including overcharging, over-discharging, rapid charging, low-temperature charging, and spontaneous internal short circuits due to aging or defects.

Once a single cell enters thermal runaway, it can quickly affect adjacent cells, resulting in thermal propagation and, ultimately, serious safety incidents. Therefore, effectively preventing or interrupting this chain reaction is critical in battery safety design.

PUW's Solution: Rapid Pressure Relief Vent Valve

To address safety challenges caused by battery thermal runaway, PUW has dedicated years of research into battery pack protection. Our series of battery Explosion-Proof Valves and rapid pressure relief vent valves are specially engineered to:

• Balance internal and external pressure automatically

• Provide fast venting and explosion protection

• Ensure water, dust, and flame resistance

• Enhance overall battery pack stability and safety

Key Features: PUW Rapid Pressure Relief Vent Valve

• Product Model: PBA4K-50

• Air Permeability Before Rupture: ≥600 ml/min @ 1.5KPa

• Air Permeability After Rupture: ≥1000 L/min @ 10KPa

• Burst Pressure (Customizable): 3 ± 1 KPa

• Low Pressure Rupture: 3–5 KPa

• Medium Pressure Rupture: 10–20 KPa

• High Pressure Rupture: ≥30 KPa

• Available Pressure Ranges:

• Operating Temperature: -40°C to 150°C

• Flame Retardant Rating: UL 94-V0

• Protection Rating:

• IP68 (1 meter water depth, 48 hours)

• IP6K9K (high-pressure water jet resistance)

• Core Functions:

• Pressure equalization

• Water and dust resistance

• Explosion prevention

• Rapid venting to stabilize internal pack pressure

Application Scenarios

PUW’s rapid pressure relief vent valves are not only suitable for new energy vehicle battery packs but also ideal for energy storage systems, portable power stations, and UPS systems—any application requiring high-level safety performance. With an integrated structural design and precise pressure control, PUW valves significantly enhance the reliability of battery systems under extreme conditions.

For further information or to request samples, feel free to contact our technical team. PUW is committed to delivering safer and smarter solutions for the future of energy systems.