The HV Electronic Coolant Pump for buses specifically refers to a brushless permanent magnet, fully shielded, CAN controllable coolant circulation pump that is suitable for the 400V/600V high-voltage platform of new energy buses, with a working voltage of DC 450-750V. Its core is used to drive 50% ethylene glycol antifreeze and provide circulating power for the high-pressure PTC water heater (HVCH), battery, motor, and electronic control. It is the “heart” of the bus thermal management system.
1、 Core Definition and Positioning
Full name: High Voltage Electronic Coolant Pump (HVCP)
Voltage range: DC 450V – 750V (covering mainstream 600V platforms for buses, compatible with 400V/800V)
Drive medium: pure water/ethylene glycol antifreeze (50% concentration)
Core purpose:
High voltage PTC water heater (HVCH) cycle (warm air/defrost)
Power battery preheating/cooling cycle
Cooling cycle of drive motor and electronic control system
Hydrogen fuel cell bus stack coolant circulation
Different from low-pressure water pump (12/24V): High voltage power supply, high power, high flow rate, high head, CAN communication, high-voltage isolation safety design, suitable for bus high-voltage platforms, cannot be mixed.
2、 Core advantage (bus scene adaptation)
✅ High voltage adaptation, safe and reliable: 450-750V high voltage isolation design, no leakage risk; IP67、 Resistant to vibration and suitable for complex road conditions on buses.
✅ High flow rate and high head: 150-300 L/min, 15-25m head, meeting the multi loop cycling requirements of HVCH (15-25kW)+battery+motor.
✅ Efficient and energy-saving, low noise: Permanent magnet brushless motor (efficiency ≥ 85%), saving about 20% energy compared to low-pressure pumps; Noise level ≤ 65dB (A), improving driving comfort.
✅ Intelligent and controllable, precise matching: CAN communication+stepless speed regulation, flow can be adjusted as needed, battery temperature difference can be controlled within ± 2 ℃, optimizing thermal management efficiency.
✅ Long lifespan, low maintenance: no mechanical brushes, no wear and tear, with a lifespan of ≥ 10000 hours, reducing the cost of bus operation and maintenance.
3、 Mainstream application scenarios (new energy buses)
Pure electric city bus: equipped with a 1.5-2.5kW high-pressure pump, driving HVCH (15-20kW) warm air+battery preheating/cooling cycle.
Hybrid/Extended Range Bus: When the engine is shut down, the high-pressure pump maintains HVCH heating and battery temperature to improve range.
High altitude area bus: Equipped with dual high-pressure pumps (2 × 2.0kW), high flow circulation, capable of handling extremely cold environments up to -30 ℃, ensuring normal operation of HVCH and battery.
Hydrogen fuel cell bus: drives the circulation of fuel cell stack coolant, maintains the operating temperature of the stack (60-80 ℃), and ensures power generation efficiency.
Post time: Apr-30-2026
