High-Power DC Charging

High current changes everything. Once a CCS2 site aims beyond the mid-300-amp range for long stretches, heat, cable weight, and driver ergonomics become the real constraints. Liquid-cooled connectors move heat out of the contact and cable core so the handle stays usable and power stays up. This guide explains when the switch makes sense, what to look for in the hardware, and how to run it with low downtime.     What really breaks at high current– I²R loss drives temperature at contacts and along the conductor.– Thicker copper reduces resistance but makes the cable heavy and stiff.– Ambient heat and back-to-back sessions stack; afternoon queues push shells past limits.– When the connector overheats, the controller derates; sessions stretch and bays back up.     Where natural cooling still winsNaturally cooled handles work well for moderate power and cooler climates. They avoid pumps and coolant. Service is simpler and spares are cheaper. The trade-off is sustained current in hot seasons or under heavy duty.     How liquid cooling solves the problemA liquid-cooled CCS2 connector routes coolant close to the contact set and through the cable core. Heat leaves the copper, not the driver’s hand. Typical assemblies add temperature sensing on power pins and in the cable, plus flow/pressure monitoring and leak detection tied to safe shutdown.     Decision matrix: when to move to liquid-cooled CCS2 Target current (continuous) Typical use case Cable handling & ergonomics Thermal margin across the day Cooling choice ≤250 A Urban fast chargers, low dwell Light, easy High in most climates Natural 250–350 A Mixed traffic, moderate turnover Manageable but thicker Medium; watch hot seasons Natural or Liquid (depends on climate/duty) 350–450 A Highway hubs, long dwell, hot summers Heavy if natural; fatigue rises Low without cooling; early derating Liquid-cooled ≥500 A Flagship bays, fleet lanes, peak events Needs slim, flexible cable Requires active heat removal Liquid-cooled     Workersbee CCS2 liquid-cooled at a glance– Current classes: 300 A / 400 A / 500 A continuous, up to 1000 V DC.– Temperature rise target: < 50 K at the terminal under stated test conditions.– Cooling loop: typical 1.5–3.0 L/min flow at about 3.5–8 bar; around 2.5 L coolant for a 5 m cable.– Heat extraction reference: about 170 W @300 A, 255 W @400 A, 374 W @500 A (published data supports engineering of higher-amp scenarios).– Environmental: IP55 sealing; operating range −30 °C to +50 °C; acoustic output at the handle under 60 dB.– Mechanics: mating force under 100 N; mechanism tested for more than 10,000 cycles.– Materials: silver-plated copper terminals; durable thermoplastic housings and TPU cable.– Compliance: designed for CCS2 EVSE systems and IEC 62196-3 requirements; TÜV/CE.– Warranty: 24 months; OEM/ODM options and common cable lengths available.     Why drivers and operators feel the difference– Slimmer outer diameter and lower bend resistance improve reach to ports on SUVs, vans, and trucks.– Cooler shell temperatures reduce re-plugs and failed starts.– Extra thermal headroom keeps set power flatter during afternoon peaks.   Reliability and service, kept simpleLiquid cooling adds pumps, seals, and sensors, but design choices keep downtime low. Workersbee focuses on field-swappable wear parts (seals, trigger modules, protective boots), accessible temperature and coolant sensors, clear leak-before-break paths, and documented torque steps. Techs can work quickly without pulling the whole harness. A two-year warranty and >10k mating-cycle design align with public-site duty.     Commissioning notes for high-power bays Commission the hottest bay first. Map contact and cable-core sensors; calibrate offsets. Stage holds at 200 A, 300 A, and target current; record ΔT from ambient to handle shell. Set current-versus-coolant curves and boost windows in the controller; enable graceful taper. Monitor three numbers: contact temperature, cable inlet temperature, and flow. Alert policy: “yellow” for drift (rising ΔT at the same current), “red” for no-flow, leak, or over-temp. On-site kit: pre-filled coolant pack, O-rings, trigger module, sensor pair, torque sheet. Weekly review: plot power hold time vs ambient; rotate bays if one lane heats earliest.     Buyer scorecard for CCS2 liquid-cooled connectors Attribute Why it matters What good looks like Continuous current rating Drives session time Holds target amps for an hour in hot weather Boost behavior Peaks need control and recovery Stated boost time plus auto-recovery window Cable diameter & mass Ergonomics and reach Slim, flexible, true one-hand plug-in Temperature sensing Protects contacts and plastics Sensors on pins and in cable core Coolant monitoring Safety and uptime Flow + pressure + leak detect + interlocks Serviceability Mean time to repair Swap seals, triggers, and sensors in minutes Environmental sealing Weather and washdowns IP55 class with tested drain paths Documentation Field speed and repeatability Illustrated torque steps and spares list     Thermal reality checkTwo conditions stress even good hardware: high ambient temperature and high duty cycle. Without liquid cooling, the controller must derate earlier to protect contacts. Using a liquid-cooled CCS2 handle lets the site sustain target current for longer, trimming queues and stabilizing per-bay revenue.   Human factorsDrivers judge a site by how quickly they can plug in and walk away. A stiff cable or hot shell slows them down and raises error rates. Slim, liquid-cooled cables make ports easier to reach and allow a natural, comfortable plug-in angle.   Compatibility and standardsThe CCS2 signaling stays the same; what changes is the heat path and the monitoring. Build acceptance around temperature rise, shell temperature, and fault handling. Keep per-bay records of current, ambient, contact temperature, and taper points to support audits and seasonal tuning.   Cost of ownership, not just CapExFrequent derating costs more in longer sessions and walk-offs than it saves on hardware. Factor session time at your top ambient bins, tech time for common swaps, consumables (coolant, filters if used), and unplanned downtime hours per quarter. For high-duty hubs, liquid-cooled connectors win on throughput and predictability.     Where Workersbee fits Workersbee’s liquid-cooled CCS2 handle is built for steady high current and easy upkeep, with field-accessible sensors, quick-swap seals, a quiet grip, and clear torque steps for technicians. Integration notes cover flow (1.5–3.0 L/min), pressure (about 3.5–8 bar), power draw under 160 W for the cooling loop, and typical coolant volume per cable length. This helps sites bring flagship bays online quickly and hold power in hot seasons without moving to bulky cables.     FAQ At what current should I consider liquid cooling?When your plan calls for sustained current in the upper-300-amp range or higher, or when your climate and duty cycle push shell temperatures up. Is liquid cooling hard to maintain?It adds parts, but good designs make the usual swaps quick. Keep a small kit on site and log thresholds. Will drivers notice the difference?Yes. Slimmer cables and cooler handles make plug-ins faster and reduce mis-starts. Can I mix bays?Yes. Many sites run a few liquid-cooled lanes for heavy traffic and keep naturally cooled lanes for moderate demand.

The market penetration of electric vehicles has grown so significantly that it can no longer be ignored, accompanied by a huge demand for charging. What troubles the electric vehicle charging industry is not a lack of market, but rather the lack of reliability, complex charging experiences, and unsatisfactory return on investment. To gain more control in the market, we need to start with Electric vehicle infrastructure. AC charging and DC charging are absolutely mainstream. A thorough understanding of their pros and cons and value realization can help us plan and configure the charging network more strategically and embrace electric vehicles more proactively.   First, let's briefly understand the basic concepts of AC and DC charging.  AC Charging uses an alternating current power source to charge an electric vehicle's battery. The AC from the grid is converted to DC by the vehicle’s onboard charger and stored in the battery. This setup means that the efficiency of AC charging is limited not only by the charger but also by the onboard charger（OBC）.    Therefore, AC charging is generally slower. Although some AC chargers are known as "Rapid Charging," they are not in the same league as DC Fast Charging. These faster AC chargers are usually referred to as Level 2 Chargers, while the lower ones are called Level 1 Chargers.    While the Charging Speed of AC charging is slower, the equipment costs are lower, they are easier to install, and the requirements for the surrounding environment and the grid are relatively low. They require minimal electrical upgrades and are easier to maintain and operate. For drivers, the charging cost is also lower. Therefore, AC chargers are well-suited for places where cars are parked for extended periods (more than an hour), such as homes, workplaces, public parking lots, or roadside parking. Since charging usually takes several hours, it is not suitable for long-distance travelers in a hurry.  Common power include 3.5kW, 7kW, 11kW, and 22kW. Some products now offer higher power, but they come with higher costs and electrical requirements.   As a renowned china charging plug manufacturer, Workersbee's AC charging products have always been popular. This includes charging connectors, charging cables, charging sockets, and portable EV chargers.   In particular, portable EV chargers come in a diverse range of products, including those with screens and without, single-phase and three-phase charging products. These products have been extensively validated in the market over the years, boasting very stable reliability, over 99.9% compatibility, user-friendly smart charging management, and outstanding outlook designs. The impressive market performance further confirms their high performance, high standards, and high reliability.    DC Charging uses a High-power charger (HPC) to draw alternating current (AC) from the grid, which is then converted into direct current (DC) by internal inverters and supplied to the EV's battery. Because the power modules handle substantial amounts of energy, DC chargers are typically larger and have higher procurement, installation, and maintenance costs, with greater electrical requirements.  Since DC power can directly supply large amounts of energy to the EV battery, reducing energy conversion losses within the vehicle, DC charging is highly efficient and fast, significantly reducing charging time. These features make DC charging ideal for public charging stations where vehicles have short stays and for highway corridors for long-distance travel, where there is ample space and convenient electrical distribution. Drivers need not worry about long charging times; a quick restroom break or a cup of coffee is usually enough to provide sufficient charge for their journey. But why doesn’t everyone always prefer fast charging? The charging cost is higher.  For charging station operators, the initial investment is substantial, including equipment, electrical upgrades, and site development, along with high ongoing maintenance costs, all of which are passed on to the drivers.  Additionally, frequent use of fast charging may potentially degrade the vehicle’s battery life time. Furthermore, some vehicles might not support fast charging despite the desire for high efficiency.   Consumers still look forward to safe and stable high-power fast charging in the future. Workersbee's STAR product, the CCS2 liquid-cooled charging plug, has achieved a peak current of up to 700A, while the CCS2 naturally cooled plug offers a continuous current output of 375A. Both products are CE certified, ensuring safety and reliability, with advanced cooling technology guaranteeing high performance and stable operation.   What Can Workersbee Offer Your Business? 1.Comprehensive AC/DC Charging Solutions: Our diverse product lineup includes AC charging solutions for residential and workplace settings, and DC charging solutions for public locations. We cater to your business's custom needs, ensuring equipment remains in optimal condition. 2.Portable AC Charging Solutions: Our EV charging cables and portable EV chargers are lightweight, making it convenient for users to charge anytime. They are designed for excellent compatibility and durability. 3.Reliable High-Power DC Charging Solutions: Our high-performance liquid cooling and natural cooling technologies ensure the safe and stable operation of equipment, enabling fast charging. 4.Cutting-Edge Technology: Our R&D team stays abreast of industry trends and technological developments, applying advanced technologies such as liquid-cooled ultra-fast charging, quick-change terminals, and ultrasonic welding. 5.Reduced Investment Costs: By adopting automated production and modular design, we ensure efficient product manufacturing and ease of maintenance, thus reducing costs from both procurement and operational perspectives. 6.High Standard International Certifications: Our products have passed CE, TUV, UKCA, UL, RoHS, and other certifications, earning trust and recognition from users worldwide. 7.Global Sales and Localized Service: Workersbee charging plugs are sold in many regions and countries globally. We offer localized services in different areas, ensuring your business receives timely, professional after-sales service and technical support.   Conclusion In the era of electrified transportation, Electric Vehicle Charging is becoming increasingly important. AC charging and DC charging each have their own advantages.  For consumers, understanding the differences between the two can help them choose the most suitable charging method based on their specific needs. For charging facility suppliers and operators, a deep understanding of these advantages and disadvantages can help optimize the configuration and layout of chargers, improving the efficiency of the charging network and driver satisfaction. Workersbee believes that we can offer your business more practical and efficient solutions. We remain committed to focusing on user needs, continuously innovating and optimizing our products, and providing robust support for your business.