The BTMS M5 maintains optimal temperatures for liquid-cooled traction batteries in high-voltage BEV and FCEV vehicles, battery-electric as well as stationary energy storage applications, maximising cell life, charge efficiency, and system performance.

Controlled by Grayson’s proprietary thermal logic software via CAN J1939 and the integrated Intelligent Thermal Control Module, it monitors coolant conditions and automatically engages active cooling, passive cooling, or electrical heating.

With all major components, including chiller, condenser, water pump, fans, and controls—housed in a single package, installation, commissioning, and servicing are simplified.

Designed for 575–800 V DC and extreme low-ambient environments, the M5 includes a 10 kW electric water heater (optional up to 30 kW) and offers a compact, chassis side-mount, ready-to-integrate solution for OEMs needing reliable thermal management in demanding climates and duty cycles.

See the key features that enhance performance and support efficient operation with your vehicle systems.

• 800V DC high-voltage design: Supports modern and next-generation BEV and FCEV platforms.
• High-Capacity Battery Heating: Delivers up to 30 kW heating, enabling effective battery pre-conditioning in extreme cold.
• Active and passive cooling with heating as standard: Ensures thermal control under all operating conditions.
• Fully integrated, pre-charged unit: Simplifies vehicle/stationary power system integration and reduces installation time and complexity.
• Chassis mount design: Optimised footprint for installation in space-limited application layouts.
• Integrated Intelligent Thermal Control module: Combines hardware and proprietary software for precise, OEM-specific thermal regulation.
• 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.
• High-voltage range: Operates from 575V to 800V DC, 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.

Contact Grayson for more technical details and performance graphs.

• Cooling capacity: Up to 8.5kW @ 40°C ambient, 25°C coolant outlet, 60l/min flow

• Electrical heating capacity: 10kW standard (Tailorable from 5kW to 30kW to suit operating environment)

• Dimensions: 1025mm x 575mm x 471mm (L x W x H)

• Voltage range: 575V to 800V DC

• Refrigerant: R134a

• Coolant type: 50/50 W.E.G

• Weight: Approx. 119kg (excluding coolant)

• Control: CAN J1939 with diagnostics, CAN bootloader

• Mounting: Suitable for chassis side-mount

An alternative option for your application.

• 3A-10025-0A02 - Active and Passive Cooling & Heating