The BTMS M3 is engineered for OEMs requiring high thermal output and flexible system packaging. It maintains optimum operating temperatures for liquid-cooled traction batteries in battery-electric and fuel-cell-electric vehicles, supporting consistent cell performance, efficiency, and service life.

Controlled by Grayson’s proprietary thermal logic software via CAN J1939 and an integrated Intelligent Control Module, the system continuously monitors coolant conditions and delivers active cooling, passive cooling, or electrical heating as required.

Unlike the M2, the M3 uses a split architecture, allowing the condenser to be mounted independently, improving installation flexibility while retaining an 11.5 kW cooling capacity. Compatible with systems up to 900 V DC, it is proven in demanding OEM applications worldwide.

Discover the performance-driven features that make our solutions reliable, efficient, and ready for the toughest operating conditions.

• Fully split condenser and chiller modules: Allows independent placement for optimal airflow and packaging flexibility.
• Configurable cooling and heating modes: Active cooling, passive cooling, and electrical heating options to match duty cycle and climate.
• Adapts to ambient temperature and coolant set-point: Optimises performance by modulating thermal output based on environmental conditions and target coolant temperature.
• Bespoke temperature set-point and CAN addresses: Factory-configured to each customer’s operating requirements for seamless integration.
• Battery pre-conditioning capability: Integrated heating enables cold-weather battery warming.
• CAN J1939 bootloader for easy software updates: Supports in-field control logic upgrades without hardware removal.
• DM1 diagnostics on CAN J1939 network: Broadcasts fault codes and status messages for simplified troubleshooting and maintenance.
• Wide high-voltage range: Operates from 420V to 756V DC, with 900V DC capability available, supporting present and next-generation BEV and FCEV platforms.
• Integrated components for simplified installation: Brushless water pump, lightweight header tank, electric expansion valve, and brushless fan are all housed within the unit.
• Long-life brushless fans and pump, scroll compressor: Delivers high efficiency, low noise, and extended service life for reduced downtime and lower TCO.
• Compact and lightweight design: Optimised for space-constrained installations.
• Validated, homologated, and certified: Fully tested for performance, durability, and compliance, including EMC R10 certification, ensuring suitability for global markets.
• Worldwide aftersales service and product support: Backed by Grayson’s global aftermarket network for parts, technical assistance, and service expertise.
• Global manufacturing capability: Produced across four plants worldwide for supply chain resilience and shorter lead times.

Each system is engineered with precise specifications to ensure consistent operation under a wide range of conditions.

• Cooling capacity: up to 11.5kW @ 40°C ambient, 25°C coolant outlet, 40l/min flow
• Dimensions (Chiller assembly): 557mm x 554mm x 440mm (L x W x H)
• Dimensions (Condenser assembly): 959mm x 285mm x 443mm (L x W x H)
• Electrical heating capacity: 3.6 kW standard (5 kW optional)
• Voltage range: 420V to 756V DC as standard - 900V DC capability available
• Refrigerant: R134a / R407C (optional)
• Coolant type: 50/50 W.E.G
• Weight: Approx. 74kg (excluding coolant)
• Control: CAN J1939 control interface with diagnostics
• Mounting: Suitable for roof, chassis, or body mounting / condenser mounted independently from chiller unit.

Choose from a selection of models tailored to different vehicle platforms, capacities, and installation needs.

• 3A-6725-0EXX – 600V DC: Active Cooling, Passive Cooling and Heating
• 3A-6725-0FXX – 600V DC: Active Cooling and Passive Cooling Only
• 3A-6725-0GXX – 600V DC: Active Cooling & Heating Only

*Contact Grayson today to learn more about 900V DC options