How Temperature Rise Affects Large Current Connectors | QS Antispark Connector Performance Test

High temperature rise is one of the most common failure causes of high-current power connectors used in battery packs, AGVs, electric forklifts and energy storage systems. Excessive temperature will accelerate metal oxidation, damage plastic housing, increase contact resistance, and even trigger safety risks such as burnout and short circuits. Many engineers overlook continuous working temperature when selecting connectors, leading to frequent equipment downtime after long-term operation.

Why does temperature rise occur for large current connectors? Contact resistance is the core factor. If the contact terminal material is impure, the plating layer is uneven, or the insertion force is unstable, contact resistance will increase continuously. According to Joule’s law, electric energy converts into heat under continuous high current load. Without effective heat dissipation design, heat accumulates rapidly inside the connector. Ordinary connectors without anti-spark structures face more severe challenges: instant surge current during plug-in generates electric arcs, which scorch contact surfaces and further raise resistance and temperature.

YOUWEI Tech’s R&D team carried out continuous temperature rise comparison tests under fixed current loads. We tested standard common connectors and our QS antispark connector under the same 120A continuous current environment. The test environment was set at 25°C ambient temperature, standard wiring specifications. After 4 hours of continuous operation, ordinary connectors showed a surface temperature exceeding 78°C, while the QS antispark connector only reached 52°C.

The outstanding temperature control performance of the QS antispark connector comes from two core designs. First, the terminals adopt high-purity copper alloy with thick gold plating, effectively reducing inherent contact resistance. Second, the built-in pre-charging anti-spark structure avoids arc ablation on contact points during connection. In addition, we optimize the internal flow channel for heat dissipation, which helps conduct heat outward quickly.

For different application scenarios, we give practical engineering suggestions. Energy storage battery modules that run 24 hours continuously should reserve at least 30% current margin to control temperature rise. Electric ships and outdoor charging equipment need to consider high ambient temperature in summer, and avoid operating connectors close to the maximum rated current for a long time.

All YOUWEI QS series antispark connectors complete strict temperature rise testing before delivery. We support customized terminal plating, housing materials and assembly methods to match low-temperature outdoor, high-temperature sealed and other special working conditions. If you are troubled by overheating of power connectors in your equipment, contact our technical team to obtain customized test reports and solution recommendations.