(Summary description)The reason for the thermal runaway of the battery pack is simple: the battery is overheated, causing thermal runaway. Of course, there are many reasons for overheating, such as uneven temperature of the battery pack, high local temperature; overcharge and overdischarge. External short circuit, internal short circuit, etc.; external force also has mechanical causes, such as collision, squeezing, puncture, and water ingress. In order to solve the impact of thermal runaway and the safety of thermal diffusion, the constant pressure balanced explosion-proof valve developed by PUW Puwei can quickly release pressure and exhaust when it reaches a certain pressure value. The product is mainly used in the field of battery PACK and other occasions that require waterproof, breathable, explosion-proof, and rapid pressure relief to balance internal and external air pressure. Air permeability: ≥600ml/min@1.5Kpa Explosion-proof pressure (customizable): 3±1Kpa Temperature resistance range: -40～150℃ Product specifications: PBA4K-50 Flame retardant rating: UL 94-V0 Protection level: IP68 (1 meter water depth for 48 hours), IP6K9K Basic functions: pressure balance, waterproof, breathable and explosion-proof, pressure relief and exhaust (air pressure balance inside and outside the battery pack) Pressure relief (when the battery cell is abnormal, the pressure can be quickly relieved and exhausted to prevent excessive pressure from damaging other structures of the battery PACK) Explosion-proof pressure can be customized according to customer requirements, and can be divided into low-pressure blasting (3~5Kpa), medium-pressure blasting (10-20Kpa), and high-pressure blasting (above 30Kpa). Meet ROHS environmental protection requirements.