Commercial Vehicle Water-cooled Unit - Battery Thermal management solutions - BTMS
                                
                                                                                        

Integrated Thermal Management

The Mannbay integrated thermal management system comprises a driver's cab air conditioning box, battery water heater PTC, chiller, solenoid valve, dehumidifier reservoir tank, electric air conditioning compressor, condenser, condenser fan, thermal expansion valve, pump, expansion tank, air conditioning panel, TMS controller, gas-liquid separator, intake three-way, pressure sensor, exhaust three-way, water inlet three-way, return water three-way, first battery box body, and second battery box body.

In the Mannbay integrated thermal management system, the independent cooling circuit of the battery is seamlessly switched to the vehicle air conditioning cooling via a solenoid valve. During the AC refrigeration process, the solenoid valve is closed, limiting the cold medium circulation into the chiller. When battery cooling is required, the TMS controller activates the solenoid valve, adjusting the speed of the electric air conditioning compressor and condenser fan to ensure optimal distribution of cabin and battery cooling.

The categories of Mannbay's bus battery thermal management products
The bus battery thermal management systems, categorised by their cooling medium, include wind cooling, fluid cooling, and direct cooling. Wind cooling systems use regulated air to manage cell temperature; while simplistic in structure and easy to maintain, these systems have low efficiency and uneven temperature distribution, failing to meet the vehicle's thermal management needs.
Direct cooling systems employ refrigerant to cool the battery directly, offering superior cooling but posing a challenge with uniform liquid distribution between battery modules. Currently, this system is only used in a limited number of cars. Water cooling systems utilise coolant as the cooling medium, offering compact structure, high heat exchange efficiency, and even temperature distribution, making it a key focus of current research.
In terms of system integration, bus battery cooling products can be divided into independent and shared types; and according to layout, they can be top-mounted or skirt-mounted.
The independent type of battery thermal management system includes a pump, battery cooler, heater module, and an independent compressor, condenser, and condenser fan. It typically uses a skirt-mounted layout that doesn't occupy roof space and is close to the battery, with a top-mounted option available. The challenges of this system are limited space, inconvenient maintenance, and varying condenser outlet positions on different models, which complicates modular design.
The shared type of battery thermal management system shares the compressor, condenser, and condenser fan with the bus air conditioner, typically using a top-mounted layout, offering significant cost advantages; however, there are challenges with matching the compressor and battery cooler, balancing vehicle cooling and battery cooling, etc.