Potting is performed to provide waterproofing and dust protection, secure the plastic housing to the metal enclosure, and mitigate the differential thermal contraction between plastic and metal. It also helps relieve stress, preventing the plastic housing from swelling or deforming and thereby avoiding damage to internal components—this is one of the primary objectives of the potting process in charging stations.

Another important function of potting the charging pile is that, after installation, vibrations may occur. If the unit is not secured with potting compound, internal wiring could become loose, compromising charging efficiency and durability—and potentially jeopardizing safe operation.

Therefore, the use of potting technology ensures the overall performance and stability of charging stations. The specific advantages are as follows:

1 , Fire-resistant and flame-retardant, reducing the risk of ignition

Encapsulating adhesive possesses UL94 V-0 Flame-retardant performance: in the event of internal component short circuits, arc formation, or high‑temperature overloads, it can self‑extinguish rapidly, isolate oxygen to prevent flame spread, and prevent high‑voltage components from igniting cables and the enclosure, thereby reducing fire risks at charging stations at the source.

2 , High-voltage insulation to prevent leakage and arcing.

The colloid completely encapsulates the high-voltage copper busbar and terminals, PCB , eliminate air gaps, Significantly enhances dielectric strength, effectively mitigating surface tracking caused by condensation and dust. Compatible with DC high voltages of up to several kilovolts, it prevents leakage current and arc flash breakdowns, ensuring the safety of both equipment and personnel.

3 , Heat conduction and dissipation to extend equipment lifespan

Thermally conductive adhesive fills the gaps between components and the housing, enabling rapid heat dissipation. IGBT , reduces transformer operating heat, lowers internal temperature rise, mitigates capacitor and wiring aging caused by high temperatures, and decreases the likelihood of overheating‑induced shutdowns and failures.

4 , Sealed protection, suitable for outdoor operating conditions

After curing, it forms a sealed protective layer that is waterproof and moisture‑resistant, resistant to salt spray, dust‑proof, and corrosion‑preventive. The elastomeric compound provides inherent elastic cushioning, absorbing vehicle vibrations and transport shocks to prevent solder joints from becoming cold‑welded or detached, while also guarding against insect and rodent gnawing that could cause short circuits.

Recommended encapsulated high-voltage EV charging station products: HNPU512 Polyurethane potting compound

HNPU512 It is a two-component polyurethane sealant that cures at room temperature or with heat. After mixing, it exhibits excellent processability, a long working life, and a moderate curing rate. The cured product features a glossy, smooth surface, high adhesive strength, superior toughness, and outstanding flame retardancy and electrical insulation properties, making it well suited for potting sensors, automotive electronics, filters, capacitors, and other electronic components that operate in humid, vibration‑prone environments.

1. Excellent process compatibility, suitable for batch potting production.

PU512 Polyurethane potting compound features low mixing viscosity and excellent flowability and permeability, enabling it to fully fill the tiny gaps between components within charging‑pile modules and charging guns. It minimizes bubble formation during potting and is compatible with automated vacuum potting lines, significantly boosting potting efficiency and meeting the demands of high‑volume charging‑pile production.

II. Electrical safety and reliability, eliminating high-voltage faults at the source.

After curing, it exhibits excellent insulation, waterproofing, and moisture‑resistance properties. Combined with flame retardancy and thermal conductivity, it can encapsulate the high‑voltage terminals, busbars, and power devices of charging stations, effectively preventing creepage and leakage caused by moisture and dust. When components overheat under load, it rapidly conducts heat to lower the temperature, and fault arcs are quickly self‑extinguished, addressing critical safety challenges such as high‑voltage fires and insulation failure.

3. Weather-resistant and deformation-proof, ensuring long-term stability and durability outdoors.

The colloid exhibits excellent toughness and strong adhesion, firmly bonding to metals, PCB , various base materials for charging piles, such as wire harnesses; Tolerable - 50℃~135℃ Thermal cycling impact, It addresses the diurnal temperature variations, rain and salt‑spray exposure, and vehicle vibrations encountered by outdoor charging stations, preventing gel cracking and delamination, thereby extending the overall service life of the equipment and reducing subsequent maintenance‑related failures.

In summary, the application of polyurethane potting compounds in new‑energy charging stations is of great significance. By appropriately selecting and applying polyurethane potting compounds, the stability and safety of charging stations can be significantly enhanced, thereby providing robust support for the widespread adoption and continued development of new‑energy vehicles.

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