E-Mobility

Seals for the New Energy Electric Vehicle (NEV) sector are mainly characterized by high demands on materials, properties, design and manufacturing processes to adapt to the unique operating environment and performance requirements of electric vehicles.

Features

High temperature resistance: The power batteries, motors and power electronics in electric vehicles generate high temperatures during operation, so seals need to be able to maintain performance over a wide temperature range.

Chemical resistance: The electrolyte in the battery pack, the coolant in the cooling system and other chemicals place higher demands on the corrosion resistance of the seals.

High insulation: Seals for high-voltage systems need to have good insulation properties to prevent electrical breakdown and electrical short circuits.

Low permeability: Seals need to be impermeable to gases and liquids, especially in critical areas such as battery packs and high-voltage connectors.

Long life: Electric vehicles typically have a long service life, and seals need to maintain their function without leakage over their design life.

Environmental requirements: As environmental awareness increases, the materials and production processes of seals need to meet environmental standards.

Material Selection

Rubber seals: such as hydrogenated nitrile butadiene rubber (HNBR), fluorine rubber (FKM), silicone rubber (VMQ), etc. These materials have good oil resistance, heat resistance and aging resistance.

Polymer seals: such as polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), etc. These materials have excellent chemical resistance and high temperature resistance, and are suitable for special environments.

Composite seals: combining the advantages of metal and polymer, such as metal-coated rubber, filled polytetrafluoroethylene (PTFE), etc., providing better mechanical strength and wear resistance.

Design Requirements

Structural design: Seals need to be designed for ease of installation, reliability and ease of maintenance.

Dimensional accuracy: Highly accurate dimensional control is the key to ensuring sealing performance.

Compatibility: Seals need to be compatible with other components in an electric vehicle, such as the battery management system (BMS), power electronics, etc.

Manufacturing Process

Molding: Suitable for rubber and certain composite seals, allowing the production of seals with complex shapes.

Injection molding: Suitable for certain plastic seals, allowing for high-volume, high-efficiency production.

Machining: Suitable for metal and polymer seals, allowing for high precision and quality seal production.

Testing and Verification

Leakage testing: Leakage testing is conducted through media such as water or oil to ensure that the seals are leak-free.

Environmental testing: Seals are tested in simulated new energy vehicle operating environments, such as high temperature, low temperature and vibration.

Life test: Evaluate the service life of seals through accelerated aging test.

Application Examples

Battery pack sealing: Ensure that the battery pack does not leak under various environmental conditions, and protect the battery module from water and dust erosion.

Motor seals: Protect the inside of motors from moisture and dust, ensuring efficient operation of motors.

Power Electronics Cooling System Seal: Prevents coolant leakage and ensures stable operation of power electronics.

High-voltage connector sealing: Ensure the sealing of high-voltage cable connections to prevent electrolyte leakage and electrical short circuit.

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