Liquid Cooling Technology for EV Charging Infrastructure

Enhancing Reliability in Harsh Environments

1. Industry Background: Harsh Outdoor Conditions Challenge Charging Infrastructure

As a critical component of electric vehicle (EV) infrastructure, charging stations are predominantly deployed in outdoor environments and must withstand a variety of harsh conditions, including:

• High levels of dust and airborne particles

• Salt spray corrosion in coastal regions

• High humidity and temperature fluctuations

• Exposure to industrial pollutants and corrosive gases

Under such conditions, conventional air-cooled charging systems face several operational challenges:

• Increased failure rates due to contamination of electronic components

• Reduced heat dissipation efficiency leading to power derating or shutdowns

• Higher maintenance frequency and operating costs

• Reduced system stability, impacting return on investment (ROI) for operators

According to the China Electric Vehicle Charging Infrastructure Promotion Alliance, public charging infrastructure continues to scale rapidly, while operation and maintenance (O&M) costs can account for over 20% of total lifecycle costs, especially for high-power systems.

👉 These challenges are driving the demand for more robust and reliable thermal management solutions.

2. Technology Evolution: Liquid Cooling Becomes the Industry Standard

2.1 Milestones in Liquid-Cooled Charging

Liquid cooling has emerged as a key enabling technology for high-power EV charging:

• Tesla introduced its V3 Supercharger in 2020

— Capable of delivering up to 250 km of range in 15 minutes

• Leading charging solution providers in China have launched liquid-cooled systems

— Achieving up to 300 km of range in just 5 minutes (based on OEM data)

According to the International Energy Agency in its Global EV Outlook 2024:

• Ultra-fast charging (≥350 kW) is a key trend in EV infrastructure

• Liquid cooling is a critical enabler for next-generation high-power charging systems

2.2 Key Advantages of Liquid-Cooled Charging Systems

Compared to traditional air-cooled systems, liquid cooling offers several significant advantages:

(1) Energy Efficiency and Cost Reduction

• Lower standby power consumption (up to ~30% reduction)

• Reduced energy loss during power transmission

• Smaller cable cross-sections, lowering material costs

(2) Superior Environmental Adaptability

• Closed-loop thermal system with no direct air exchange

• Protection against:  Dust, Salt spray, Moisture

• Ideal for: Coastal regions, Industrial zones, Highway and remote deployments

(3) Enhanced Safety and Maintainability

• Physical separation between electrical and cooling systems

• Modular design for easier maintenance

• Independent cleaning of thermal management components

(4) High Reliability and Extended Lifespan

• Precise temperature control (typically 40–60°C operating range)

• Reduced stress on power electronics (IGBTs, MOSFETs)

• System lifespan extended by over 30% in many cases

3. Core Component: Liquid Cooling Circulation Pump

3.1 Working Principle

Liquid-cooled charging systems utilize a closed-loop circulation mechanism:

(1) Coolant absorbs heat from charging cables and connectors

(2) A pump drives the coolant through the system

(3) Heat is dissipated via a heat exchanger

(4) The cooled liquid recirculates

👉 The EV Charger liquid coolant pump is the core component that ensures continuous and efficient heat transfer.

3.2 Key Selection Criteria for Liquid Coolant Pumps

To meet the demands of high-power EV charging, coolant pumps must meet the following requirements:

(1) High Thermal Performance

• Stable flow rate and pressure

• Efficient heat removal under high current loads

(2) Wide Operating Temperature Range

• Typical range: -40°C to +85°C

• Suitable for extreme climates

(3) High Reliability and Long Service Life

• Lifetime ≥ 30,000 hours

• Maintenance-free operation for remote installations

(4) Comprehensive Protection Features

• Dry-run protection

• Locked-rotor protection

• Overcurrent and overvoltage protection

• Reverse polarity protection

4. TOPSFLO Liquid Cooling Pump Solutions

TOPSFLO is a leading manufacturer of brushless DC pumps, offering advanced liquid cooling solutions for EV charging applications.

4.1 Lightweight and High-Efficiency Design

• Enables up to 50% reduction in cable diameter

• Significantly reduces cable weight and improves user handling

• Optimized PCB design minimizes temperature rise

4.2 Adaptability to Extreme Conditions

• Tested under rapid temperature cycling

• Reliable performance in both extreme cold and heat

4.3 Long Lifetime and Maintenance-Free Operation

• Service life exceeding 30,000 hours

• Ideal for highways and remote charging stations

4.4 Advanced Safety Protection

For example, the TA60 liquid coolant pump integrates:

• Dry-run protection

• Locked-rotor protection

• Overcurrent protection

• Overvoltage protection

• Reverse polarity protection

• Constant power output

5. Market Outlook and Industry Trends

With the rapid evolution of EV platforms toward 800V architectures:

• Charging power levels continue to increase (350 kW → 600 kW+)

• Thermal management requirements become more critical

• Liquid cooling adoption is accelerating

According to BloombergNEF:

• Ultra-fast charging is expected to account for over 30% of public charging infrastructure by 2030

• Liquid cooling will become a standard configuration for high-power charging systems

6. Conclusion

Driven by both environmental challenges and increasing power demands:

👉 Liquid-cooled charging infrastructure is transitioning from an optional upgrade to a core technological requirement.

As a critical component, the liquid coolant pump directly impacts:

• Thermal efficiency

• System reliability

• Maintenance costs

• Overall return on investment

Looking ahead, as the industry moves toward higher power, greater reliability, and smarter systems, liquid cooling—and its key components—will remain central to innovation and competitiveness in EV charging infrastructure.