PTC Coolant Heater For BTMS

If you're looking for the ptc coolant heater for btms, welcome to wholesale the product from our factory. As one of the leading manufacturers and suppliers in China, we will offer you the best service and fast delivery. Now, check the quotation with our seller.

 

PTC Coolant Heater for BTMS

 

NF Group's liquid-based battery thermal management system (BTMS) combines a high-efficiency refrigeration cycle with a PTC heating circuit, delivering precise temperature control for lithium-ion batteries across extreme operating conditions, ensuring optimal performance, safety, and extended service life.

 

 

 

Temperature-power curve	Water resistance characteristic curve

 

 

 

Type	Condition	Minimum value	Typical value	Maximum value	Unit
Working ambient temperature		-40		85	℃
Storage temperature		-40		120	℃
Relative humidity		5		95	%
Altitude				5500	m
Medium operating temperature		-40		90	℃
Coolant capacity in housing			230		mL
Coolant specification	Glycol/Water		50/50
Overall dimension			187.1*159.3*105		mm
Weight	No coolant		2050		g
Burst pressure of water tank	Room temperature			5	bar
Input power	DC350V,10L/min,60℃	5000	5500	6000	W
Low voltage range	DC	9	12/24	32	V
Low voltage supply current	DC	40	70	150	mA
Low voltage quiescent current	Sleep state		15	100	uA
High voltage range	DC	250	350	450	V
High voltage quiescent current				2	mA
High voltage discharge time	High voltage power outage			5	s
High voltage starting impulse current	Medium temperature＜30℃			35	A
High voltage interlock function	Yes
Insulation resistance	DC1000V	100			MΩ
Insulation strength	AC1900V/60s			10	mA
Degree of protection			IP67
Contact discharge ESD				6	KV
Air discharge ESD				15	KV
Protection function	Overcurrent, short circuit, overheating, overvoltage, undervoltage and other protection functions
Temperature detection	There are temperature sensors at the water inlet and outlet positions and on the PCB
Overheat protection threshold	Coolant > 70℃, hysteresis 10℃
Communication interface	CAN
Terminal resistance	None

 

1. System Overview 

This diagram illustrates a liquid-cooled and heated battery thermal management system (BTMS) for lithium-ion batteries. It combines a refrigeration cycle (cooling) and a PTC heating circuit (heating) to maintain the battery pack within its optimal operating temperature range , ensuring performance, safety, and longevity.

2. Key Components & Functions

A. Refrigerant Circuit (Cooling Loop)

 

• This loop removes heat from the battery during high-temperature conditions (e.g., fast charging, high-load driving).
• Compressor: Pressurizes and compresses low-pressure refrigerant vapor into high-temperature, high-pressure gas.
• Condenser: Releases heat from the high-pressure refrigerant to ambient air (via the water tank/radiator), condensing it into a high-pressure liquid.
• Expansion Valve: Reduces the pressure of the liquid refrigerant, causing it to cool rapidly into a low-pressure liquid-vapor mixture.
• Evaporator: Absorbs heat from the coolant circuit, vaporizing the refrigerant back into low-pressure vapor, which returns to the compressor to repeat the cycle.

 

B. Coolant Circuit (Liquid Loop)

 

• This is the intermediate loop that transfers heat between the battery, heat exchanger, and the refrigeration/heating systems.
• Electronic Water Pump: Circulates the coolant (e.g., ethylene glycol solution) through the entire loop.
• Heat Exchanger: Acts as the interface between the refrigerant circuit and coolant circuit. It transfers cooling from the evaporator to the coolant (for battery cooling) or transfers heat from the coolant (for heating).
• Battery Pack: The load to be thermally managed. Heat is absorbed from the battery during cooling, and heat is delivered to the battery during heating.

 

C. Heating Circuit (Low-Temperature Operation)

 

• This loop warms the battery in cold environments to maintain performance (e.g., low-temperature charging/discharging).
• PTC Coolant Heater: A positive temperature coefficient heater that electrically heats the coolant before it flows to the battery. It is self-regulating, preventing overheating.
• PTC/PT100 Sensor (PTC): A temperature sensor that monitors the coolant or battery temperature, providing feedback to the system controller to adjust heating/cooling power.

D. Water Tank/Radiator

The condenser rejects heat to ambient air through this component, acting as the heat sink for the refrigeration cycle.

3. Operating Modes

Mode 1: Cooling Mode

 

• The compressor runs, and the refrigeration cycle activates.
• The evaporator cools the coolant in the heat exchanger.
• The electronic water pump circulates the chilled coolant to the battery pack, absorbing heat.
• The warmed coolant returns to the heat exchanger to be cooled again.
• Heat absorbed by the refrigerant is rejected to ambient air at the condenser/water tank.

 

Mode 2: Heating Mode

 

• The PTC coolant heater activates, heating the circulating coolant.
• The pump circulates the heated coolant through the heat exchanger and to the battery pack.
• Heat is transferred to the battery to raise its temperature to the optimal range.
• The refrigerant circuit is typically inactive in this mode.

 

4. Key Advantages of This System

 

• Precise Temperature Control: Maintains uniform cell temperatures and avoids overheating/overcooling.
• Dual-Capability: Supports both cooling (high temp) and heating (low temp), suitable for all climate conditions.
• High Efficiency: Liquid-based heat transfer is more efficient than air cooling for high-energy-density batteries.
• Safety & Reliability: Integrated sensors and self-regulating PTC prevent thermal runaway and component damage. 

 

 

To receive a tailored quotation for the PTC coolant heater that meets your specific application requirements, please kindly provide the following information:

- Target application (passenger EV, commercial vehicle, energy storage, etc.)
- Required working voltage (DC) and heating power (kW)
- Coolant type (ethylene glycol/water mixture, pure water, etc.)
- Required heating capacity and maximum operating temperature
- Required terminating resistor
- Required communication method and baud rate
- Quantity and target delivery schedule

Our engineering team will review your requirements and provide a detailed quotation with lead time, technical specifications, and commercial terms within 2 working days.

 

We offer multiple shipping solutions to meet your delivery timeline and cost requirements:

1. Sea Freight (FCL/LCL)
Ideal for large-volume orders. We work with reliable carriers to ensure safe, cost-effective door-to-port or door-to-door delivery to major ports worldwide.

2. Air Freight
Recommended for urgent orders or small shipments. Fast transit times to meet tight production schedules, with door-to-door delivery options available.

3. Express Delivery (DHL/FedEx/UPS)
For small samples or time-sensitive shipments. Express services provide end-to-end tracking and delivery within 7-10 working days globally.

4. Custom Logistics Solutions
We can also coordinate with your preferred freight forwarder to handle the shipment from our warehouse to your designated location.

All products are securely packaged in anti-static, shockproof materials to prevent damage during transit. A full set of shipping documents (commercial invoice, packing list, CO, etc.) will be provided for customs clearance.

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