SST-Porous®Plastic threaded lithium battery pack explosion-proof valve
SST-Porous®Plastic threaded explosion-proof valve for lithium battery pack of new energy vehicles，made by SST-Porous® PTFE waterproof and air permeable membrane and plastic cover, welded by ultrosonic or hot pressing, prevents battery from exploring when releasing large amounts of gas; it can be waterproof, dustproof and air permeable under normal working condition, ingress protection rate up to IP67; it can be reused with long service life.
一、 Summary
The marketability of hybrids and electric cars depends on the batteries in a large extent. They must have high energy density, high performance and long service life, while also meeting stringent safety standards. In electric vehicles, lithium-ion batteries currently dominate the field in order to obtain the highest capacity and voltage, many lithium-ion batteries are linked together in the power battery. As a result, battery chambers in electric cars are usually very large, weighing several hundred kilograms. For maximum safety, they are usually installed in a sealed housing under the seat at the bottom of the vehicle.
Therefore, when a vehicle encounters a puddle, car wash or fire, the batteries in the high voltage pool must be adequately protected to prevent water from seeping into the body of water (for example, in difficult terrain or flood). Moisture can cause short circuits that compromise the safety and function of safe vehicles.
二、 Solution
However, the battery case cannot simply be sealed. Significant fluctuations in internal pressure due to temperature changes, possible high voltage batteries and altitude. Excessive pressure may cause deformation or even broken of the battery casing. So high-voltage battery cases in electric vehicles require pressure equalization systems that allow excess pressure to dissipate while keeping water out of the housing.
To meet this challenge, we developed SST-Porous® plastic & explosion-proof valves. The PTFE explosion-proof membrane is able to compensate for pressure differences while keeping water, dust, dirt and even oil out. They made the degassing device developed not only to protect the high-voltage battery from heavy rain or temporary immersion, but also this could even stop the high-pressure battery from ejecting water pressure cleaners.
At the same time, the internal pressure increasing instantaneously, PTFE porous membrane enables automaticly and rapidly gas releasing, and SST-Porous® plastic & explosion-proof valve achieves automatic pressure release under rated pressure to prevent battery pack from exploding due to sharp accumulation of internal pressure.
一、 Characteristic
- 1） Safety-SST-Porous@ explosion-proof membrane allows quick release of gas, and quick release internal pressure of the battery pack
- 2）Effectively reduce the condensation of battery pack to prevent short circuit and corrosion inside the housing caused by condensation
- 3）Prolong the service life of the system–Continuous pressure compensation in the housing (waterproof, breathable and dust-proof), while meeting the protection level of IPX7, IP65
二、 Working principle
Situation 1: When the pressure inside the pack housing is low
The PTFE explosion-proof membrane in the structure of SST-Porous plastic & explosion-proof valve works normally, which has the same working principle as that of ordinary waterproof and breathable membrane, namely to achieve balance of internal and external pressure difference, waterproof, breathable and dustproof
Situation 2: When the pressure inside the pack housing increases dramatically
In the first stage, the safety valve in the structure of SST-Porous® plastic & explosion-proof valve opened instantaneously, making pack interconnect with the inside and outside, thus realizing rapid gas release, achieving pressure balance and preventing cavity bursting
The second stage: when the internal and external pressure balance, the safety valve returns to the initial sealing effect, so as to return to the normal working state.
O-A process: Pack internal pressure difference is within 35kPa. The PTFE explosion-proof membrane in the structure of SST-Porous plastic & explosion-proof valve plays a waterproof, breathable and dust-proof role in preventing cell shell deformation and seal failure, and balancing internal and external pressure difference.
A-B process: Once Pack internal pressure difference is greater than 35kPa, mixed gas and liquid pushes the safety valve of SST-Porous® plastic & explosion-proof valve and has instant direct contact with the outside to release gas and high internal pressure rapidly, avoiding battery pack explosion and reducing explosion damage.
B-C process: When the internal and external pressure difference is balanced, the valve returns to the initial sealing effect, so as to return to the normal working state.
三、 Product structure & physical parameters
Table 1 Product structure
|
Code |
Material of key parts | Function layer | Seal ring |
Color |
|
BD-E-M42-08 |
Plastic | SST-Porous®PTFE explosion-proof membrane | Silicone O-ring |
Nature color |
Table 2 physical parameters
| Code | Air flow,
ml/min@1.5kPa |
WEP，
mbar |
Temperature，℃ |
IP rate |
Blasting point，
kPa |
Service life/year |
|
BD-E-M42-08 |
300~1000ml
(Customized） |
120 | -40℃～ +125℃ | IP67 | 30~50 |
5~10 |
[Remarks]
* Any doubt please contact sales engineer – info@spider-amoy.com
* The above data are measured as per samples, so the actual performance cannot be guaranteed
Typical application
Automotive, energy and power industries：
1） Power batteries for hybrid and electric vehicles
2）Vehicle starter battery
3） Fixed high voltage cell
E-mail：weitaiyan@spider-amoy.com
WhatsApp：18695679892
