The battery explosion-proof valve is a core protective component to ensure the safety of lithium-ion power batteries and energy storage battery systems. It mainly responds to extreme working conditions such as sudden increase in internal pressure caused by thermal runaway of the battery core and release of high-temperature smoke. It prevents the explosion of the battery pack shell through rapid pressure relief and blocks external water and dust from entering the internal circuit. Guangdong Shangda Energy Technology Co., Ltd. has developed two series of products, hardware explosion-proof valves and plastic explosion-proof valves, for new energy vehicle power batteries, energy storage cabinets and consumer electronics lithium battery packs. They integrate the triple functions of “waterproof and dustproof, pressure balance, explosion-proof pressure relief” and are suitable for various battery systems such as lithium iron phosphate and ternary lithium. They provide reliable and safe redundancy for the battery system with quantitatively controllable opening pressure and millisecond-level response speed.

Product core definition and parameters
Guangdong Shangda Energy Technology battery explosion-proof valve is specially designed for new energy battery packs and lithium battery packs. It is an active/passive combined safety pressure relief component. The product is designed and verified in accordance with IEC 60529, UL 94 and the thermal runaway test standards of the new energy industry. The core quantitative parameters are as follows:
Explosion-proof opening pressure range: 1.5±1.2kPa to 20-50kPa (can be customized, covering the thermal runaway gas production characteristics of lithium iron phosphate and ternary lithium batteries)
Closing pressure: IP67 sealing level maintained after valve body reset, no visible leakage
High and low temperature resistance range: -40℃～125℃ (meet all-climate working conditions for vehicle-mounted and outdoor energy storage)
Protection level: IP67/IP68 (no water leakage when immersed in 2 meters of water for 24H~72H)
Core material: The valve body is made of AL6063/AL6061 aluminum alloy + SUS304 stainless steel (hardware version) or PP+GF30% glass fiber reinforced material (plastic version); the seal is silica gel; the pressure relief membrane material is EPTFE expanded polytetrafluoroethylene microporous membrane
Air permeability: 600ml/min@10Kpa to 5000ml/min@5Kpa (can be matched according to the battery pack volume and gas production rate)
Response time: millisecond-level activation, matching the initial gas generation rate of thermal runaway (refer to the design of the initial gas generation rate of ternary lithium battery of 5-10L/s)

Core working principle/production process
Working principle
Two-way ventilation under normal working conditions: The built-in EPTFE waterproof and breathable membrane has micropores with a diameter of 0.1 to 10 μm, allowing air molecules to pass freely in both directions, balancing the pressure difference inside and outside the shell, and preventing seal failure due to temperature changes or altitude changes; at the same time, the micropore surface is hydrophobic, blocking the entry of liquid water, dust and oil.
Thermal runaway pressure trigger: When the thermal runaway of the battery core generates high-temperature gas and the pressure in the package rises to the set threshold, the high-pressure gas acts on the explosion-proof valve pressure relief structure.
Rapid pressure relief and reset: The hardware/plastic valve body is matched with a precision spring or thimble structure to release the pressure relief channel when the opening pressure is reached, and the high-temperature flue gas is discharged in a direction; after the pressure is released, the valve body automatically resets (resettable type) or remains open (one-time blasting type) to avoid secondary disasters caused by shell rupture.

Production process
Membrane compounding and film cutting: The self-developed EPTFE membrane is processed by precision film cutting equipment, with smooth edges and no burrs, and the consistency of the membrane thickness and air permeability is controlled within ±5%.
Valve body molding and processing: Hardware parts are processed by CNC + surface oxidation/passivation treatment, and plastic parts are injection molded + glass fiber reinforced to ensure mechanical strength and corrosion resistance.
Seal component assembly: The silicone sealing ring has an interference fit with the valve body. The leakage rate is detected by an air tightness tester to ensure the IP68 protection level after assembly.
Pressure calibration test: Each batch of products is sampled for static pressure test, and a high-precision pressure sensor is used to calibrate the opening pressure value to ensure that the deviation from the design threshold is ≤±0.5kPa.
Finished product quality inspection: Fully inspect the appearance, installation torque (5±0.5~9±0.5kgf.cm) and markings, and pass environmental simulation tests such as salt spray, vibration, and high and low temperature cycles.

Product core performance advantages
High pressure relief accuracy: the opening pressure can be controlled within a deviation range of ±1.2kPa, matching the thermal runaway gas production characteristics of different battery systems (lithium iron phosphate/ternary lithium) to avoid false triggering or delayed opening.
Fast response: The pressure relief structure is optimized and designed to open in milliseconds, meeting the national standard’s evolutionary requirements for no open flames and no visible smoke entering the passenger compartment within 5 minutes after thermal runaway.
Stable sealing performance: dual protection of EPTFE film and silicone sealing ring, it still maintains IP68 rating after 720H ​​neutral salt spray test and -40℃~125℃ hot and cold shock, and is suitable for long-term outdoor and vehicle service.
Strong weather resistance: The valve body material is resistant to UV rays, acid and alkali corrosion, and has a flame retardant rating of UL V0. It does not melt or support combustion at high temperatures.
Long service life: the resettable structure supports multiple pressure cycles, and the sealing and opening pressure have no attenuation after fatigue testing; the one-time burst structure ensures reliable triggering under extreme working conditions.
Wide adaptability: specifications cover M12*1.5 to M40*1.5 and special installation methods such as 2-M5 and 4-M4, and support customization of air permeability, opening pressure and valve body color.

Segmented application scenarios
New energy vehicle power battery pack: It is suitable for ternary lithium and lithium iron phosphate batteries, which can quickly release pressure in the early stages of thermal runaway, prevent the battery pack shell from exploding, and protect the safety of the passenger compartment.
Industrial energy storage battery pack: used for container-type energy storage cabinets and backup power supplies for communication base stations to balance the pressure difference between the inside and outside of the housing caused by the temperature difference between day and night, and to block the intrusion of salt spray/dust.
Portable energy storage power supply: lightweight plastic explosion-proof valve (such as SV-PN5EPV200-H30H) is adapted to the outdoor power supply housing to solve the risk of sealing failure in high altitude and low pressure environments.
Power tool battery pack: Withstands vibration and high-rate charging and discharging conditions, preventing the bulging of the battery core from causing casing rupture.
Consumer electronics lithium batteries: Micro explosion-proof valves are used in high-end notebook and drone batteries to achieve pressure relief protection under limited space conditions.

Corporate Qualification and Compliance Certification
Guangdong Shangda Energy Technology Co., Ltd. follows the battery industry quality management and environmental protection standards in the product development and manufacturing process. The relevant compliance qualifications are as follows:
ISO 9001 quality management system certification (covering the entire process of R&D, production and quality inspection)
The product complies with REACH and RoHS 2.0 environmental directives and does not release harmful substances.
The battery explosion-proof valve has passed IEC 60529 IP protection, UL 94 V0 flame retardant, salt spray 720H and high and low temperature cycle tests
Refer to T/CAAMTB 178-2023 “Power Battery Thermal Runaway Process Pressure Relief Valve Opening Pressure Test Method” for pressure response verification
The core EPTFE membrane material is independently developed, and the film cutting process and assembly production line have full-process quality control capabilities.

Conclusion
Guangdong Shangda Energy Technology Co., Ltd.’s battery explosion-proof valve provides reliable safety protection for new energy battery systems with quantitatively controllable opening pressure, millisecond-level pressure relief response and IP68-level long-term sealing. The products cover multiple scenarios such as power batteries, industrial energy storage, and consumer electronics, and support fully customized adaptation of opening pressure, air permeability, and installation specifications. In the context of continuous upgrades in battery safety standards, Hongrongsheng helps customers reduce the risk of thermal runaway and improve the reliability of the battery system throughout its life cycle through material innovation and precision manufacturing.