NEV Battery Thermal Management Unit

 

NEV Battery Thermal Management Unit

 

The performance, safety, and lifespan of new energy vehicle (NEV) power batteries are highly dependent on operating temperature. The Battery Thermal Management Unit (BTMU) is a critical system component designed to maintain the battery pack within the optimal operating temperature range (-40℃~+50℃). It integrates cooling, heating, and temperature balancing functions, effectively preventing battery performance degradation, thermal runaway, and extending battery service life. Our BTMU is engineered for various NEV types, including pure electric vehicles (BEVs), plug-in hybrid vehicles (PHEVs), and commercial electric vehicles, providing stable and efficient thermal management solutions.

 

 

The solid red line in the figure represents the refrigeration cycle, and the dashed blue line represents the coolant cycle. This unit has three modes,including cooling mode, heating mode, and self-circulation mode. The unit switches between these three modes based on the parameters feedback from the battery pack BMS.

 

Cooling mode

 

The fan and compressor are turned on, and the high-temperature and high-pressure refrigerant is discharged from the compressor, entering the condenser for heat release and cooling. Then, it is throttled and depressurized through a thermal expansion valve for cooling. The low-pressure and low-temperature refrigerant enters the battery cooler and exchanges heat with the high-temperature coolant flowing out of the battery pack. The refrigerant absorbs heat and enters the compressor suction port, completing a refrigeration cycle. At the same time, the high-temperature coolant flowing out of the battery pack outlet passes through the water pump and flows through the chiller to obtain cooling, forming a low-temperature coolant that enters the battery pack inlet to cool the battery and complete a water circuit cycle. 

 

Heating mode

 

The fan and compressor are turned off, the water pump and electric heater are turned on, and the low-temperature coolant is heated by the electric heater before flowing through the chiller and entering the battery pack to heat the battery.

 

Self-Circulation mode

 

The compressor and electric heater are turned off, the electronic water pump and fan are turned on, and the coolant circulates between the thermal management unit and the battery pack to remove the heat from the battery pack.

 

 

1	Model	NFEHP6.0-1
2	Refrigeration capacity	7KW
3	Heating capacity	8KW
4	Rated voltage	600VDC
5	Low voltage power supply	16-32VDC
6	Overvoltage protection/recovery voltage	750/730VDC
7	Undervoltage protection/recovery	400/420VDC
8	Refrigerant carrier	50%:50% Ethylene glycol/Water solution
9	Refrigerant	R134a
10	Compressor displacement	34cc
11	Working temperature	-40℃~+50℃
12	Unit protection leve	IP67
13	Outer diameter of water inlet pipe	Φ20mm
14	Outer diameter of water outlet pipe	Φ20mm
15	Total mass	＜50KG
16	Communication method	CAN2.0B

 

- Passenger Vehicles: Pure electric sedans, SUVs, hatchbacks, plug-in hybrid vehicles.

- Commercial Vehicles: Electric buses, electric logistics vehicles, electric vans, electric trucks.

- Special Vehicles: Electric engineering machinery (electric excavators, loaders), electric forklifts, electric sightseeing vehicles.

- Energy Storage Systems: Industrial and commercial energy storage cabinets, household energy storage batteries (stationary applications).

 

 

 

 

We strictly implement automotive-grade quality control standards, and all BTMU products have passed ISO/TS 16949 quality management system certification, as well as relevant international certifications (such as CE, ROHS). Each unit undergoes rigorous testing before leaving the factory, including thermal performance testing, electrical safety testing, vibration testing, salt spray corrosion testing, and long-term durability testing, ensuring product quality meets global automotive industry requirements.

We provide comprehensive after-sales support: 24-hour technical consultation, professional installation guidance, free maintenance and replacement of defective products within the warranty period, and lifelong technical upgrade services.

 

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