With the rapid development of the global new energy vehicle market, the safety and reliability of power batteries, as the core component of electric vehicles, have attracted much attention. Battery sealing technology is directly related to the battery's water resistance, dust resistance, high-temperature resistance and anti-aging performance. Among various sealing materials, silicone rubber has become the preferred material for sealing new energy vehicle batteries due to its excellent performance. This article will deeply explore the key role and advantages of silicone rubber in battery sealing.
Challenges in Battery Sealing for New Energy Vehicles
Power battery packs (such as lithium-ion batteries) generate heat during operation and may be exposed to harsh environments such as moisture, vibration, and chemical corrosion. Therefore, battery sealing materials need to meet the following requirements:
1. Waterproof and dustproof: Prevents moisture and dust from entering, avoiding short circuits or corrosion.
2. Resistance to high and low temperatures: It maintains elasticity within the range of -40℃ to 200℃.
3. Shock absorption and buffering: Reduce the impact of vibrations during vehicle operation on the battery.
4. Chemical stability: Resistant to erosion by chemical substances such as electrolyte and coolant.
5. Long-term durability: Ensure the sealing reliability of the battery throughout its entire life cycle.
Traditional sealing materials (such as common rubber or plastic) are difficult to fully meet these demands, while silicone rubber stands out with its unique properties.
The outstanding properties of silicone rubber:
Silicone Rubber is a high-molecular elastomer with siloxane as the main chain and has the following advantages:
1. Excellent temperature resistance
Silicone rubber can maintain elasticity within the range of -60℃ to 250℃, without becoming brittle at high temperatures or hardening at low temperatures. It is highly suitable for the use of electric vehicle batteries in extreme climates.
2. Excellent water resistance and air tightness
Silicone rubber has a dense molecular structure, which can effectively block moisture, dust and harmful gases, prevent the interior of the battery from getting damp or oxidized, and extend the battery life.
3. Excellent shock resistance and buffering capacity
Silicone rubber has high elasticity and can absorb the vibration and shock during vehicle operation, protect the internal structure of the battery, and reduce damage caused by mechanical stress.
4. Chemical corrosion resistance
Silicone rubber has extremely strong resistance to electrolyte, coolant, salt spray, etc., preventing seal failure caused by chemical corrosion.
5. Environmental protection and long service life
Silicone rubber is non-toxic and odorless, complies with the RoHS environmental protection standard, and has excellent aging resistance, which can maintain a sealing effect for a long time.