Best Electric Car BTMS – Reliable Thermal Management for EV Batteries

Guchen – Manufacturer of 8kW Battery Thermal Management Systems

Name: 8kW BTMS | Electric Vehicle Battery Thermal Management Solutions
Brand: GUCHEN
Rating: 5 (5 reviews)

Designed as an independent and modular system, Guchen's 8kW battery thermal management system (BTMS) is specifically developed for power battery packs that require up to 8kW of cooling capacity. With adequate installation space, this adaptable unit can be applied to a wide range of new energy vehicles, including large buses and heavy-duty trucks.

Key Features:
- Modular Independence: Designed as a standalone unit for easy integration across different vehicle models.
- 8kW Cooling Capacity: Tailored to meet the cooling demands of power battery packs needing up to 8kW of cooling.
- Liquid Cooling:This method offers higher heat dissipation efficiency, allowing the heat generated by the device to be carried away faster. Liquid cooling technology reduces the battery's temperature more efficiently, improving its performance and lifespan. Compared to the noise generated by a fan, the noise of liquid cooling is much lower.

Guchen's battery pack thermal management system maintains batteries within ideal temperature ranges, therefore improving the dependability, performance, and service life of modern energy vehicles.

Learn more about our BTMS Solution for EVs in the full catalogue.

8kw Battery Thermal Management Unit Working Mode

★Refrigeration method: Uses rotary DC variable frequency compression refrigeration. The coolant is cooled via plate exchange and circulated by an electronic water pump to cool the battery, effectively managing high temperatures from charging and discharging.

★Self-circulation mode: The compressor does not start, and the electronic water pump drives the coolant circulation to meet the battery cooling requirements with a lower thermal load.

★Control strategy: The controller connects to the BMS via CAN communication to receive and analyze its messages. Based on the analyzed parameters and built-in strategy, it controls the compressor and adjusts the fan and water pump speeds via PWM. The controller also uploads its status to the BMS to meet battery thermal management requirements.

8KW Battery thermal management system technical parameters

Model		NB231201
Working Temperature		-15-60℃
Net weight of single unit		≤55kg (without coolant)
Coolant		50% ethylene glycol/water solution
Overall Dimension		l853w577h285
Rated input power		≤3.5kW
Noise		≤78dB
Waterproof grade		The whole machine meets IP27, and the high-voltage part meets IP67.
Flame retardant grade		Horizontal combustion HB grade, vertical combustion V-0 grade
Insulation voltage		1000VDC
Insulation resistance		>100MΩ
Cooling Capacity		8.0kW
Piping interface		Outlet: O.D. 25mm, Return: O.D. 25mm
Refrigerant Circuit	Refrigerant	R134a
	Compressor	Electric compressor, adjustable speed control
	Condenser	Parallel flow
	Electronic fan	PWM control, adjustable power, Pmax≤ 300W (single fan)
	Plate heat exchanger	Stainless steel plate heat exchanger
	Throttling device	Thermal expansion valve
	System pressure resistance	4.5MPa
Temperature sensor	Sensors	Thermistors
	Measuring range	Outgoing and incoming water -10～105℃
	Measuring range	Ambient temperature -40～105°C
	Measuring range	Exhaust temperature -40～150°C
	Control Precision	≦±1℃
Controller	Chip	GD32F105、Pmax≤15W
	Communication Protocol	CAN2.0
	Baud rate	250/500
Case color		Black/Silver
High voltage power supply (working voltage)		DC400～750V
Low-voltage power supply (working voltage)		DC18～32V
Coolant Circuit	Coolant	50% ethylene glycol aqueous solution (1:1 volume ratio)
	Pipe material	CU
	Pipe connection type	Clamp
	Pressure resistance of pipeline	≥5bar
	Pipe outer diameter	Unit side 25mm
	Electronic water pump	Lift ≥20m, rated power 240W

Unique design of battery thermal management system

One function and three modes

Battery thermal management system is mainly composed of water pump, compressor, plate exchange, expansion valve, condensing fan, condenser, four-in-one module, high-voltage wiring harness, low-voltage wiring harness, controller, temperature sensor and other components.
The system has one function three modes, one function for cooling the battery. The three modes are shutdown mode, self-circulation mode, and cooling mode.

The switching of the three modes of the unit is controlled by the BMS of the vehicle, and the following is the working status of the main components in the three modes:
◆ Shutdown mode: the system is in standby mode.
◆ Cooling mode: water pump on, fan on, compressor on;
◆ Self-circulation mode: water pump on, fan off, compressor off.

Water Pump Performance Curve in Battery Thermal Management

This chart illustrates the relationship between flow rate, head, and power for the water pump used in an 8 kW battery thermal management system.

Guchen BTMS | Complete Unit Layout & Dimensional Overview

Detailed view of the Guchen BTMS unit with overall dimensions and interface positions for installation reference

8kW BTMS | Electric Vehicle Battery Thermal Management Solutions

Best Electric Car BTMS – Reliable Thermal Management for EV Batteries

Guchen – Manufacturer of 8kW Battery Thermal Management Systems

8kw Battery Thermal Management Unit Working Mode

8KW Battery thermal management system technical parameters

Unique design of battery thermal management system

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