Cubic ATRS-1010-P Battery Thermal Runaway Pressure Sensor

Overview

The Cubic ATRS-1010-P Battery Thermal Runaway Pressure Sensor is an automotive-grade MEMS transducer engineered for early detection of incipient thermal runaway events in lithium-ion battery packs. Unlike conventional ambient pressure monitors, the ATRS-1010-P is specifically calibrated to detect subtle, rapid pressure transients—typically in the 50–160 kPa absolute range—that precede gas venting during cell-level exothermic decomposition. Its measurement principle relies on a high-stability silicon piezoresistive sensing element integrated with on-chip signal conditioning and temperature compensation algorithms compliant with AEC-Q100 Grade 2 reliability requirements. The sensor operates as a distributed node within the battery pack’s hierarchical monitoring architecture: it continuously samples pressure at 100 Hz in active mode, detects deviations exceeding defined thresholds, and triggers immediate wake-up signaling via CAN to the Battery Management System (BMS). This enables time-critical intervention—including contactor disengagement, thermal isolation activation, or HVAC emergency ventilation—before catastrophic propagation occurs.

Key Features

• Automotive-qualified MEMS pressure sensing core with built-in temperature compensation across −40 °C to +125 °C
• Dual-mode operation: high-speed sampling (10 ms interval) for real-time event capture; ultra-low-power sleep mode (<100 µA static current) for extended system standby
• Robust CAN 2.0B interface (500 kbps) supporting standardized message framing per ISO 11898-1, enabling seamless integration into OEM BMS firmware stacks
• High overpressure resilience: 600 kPa functional limit and 800 kPa burst rating ensure survivability during violent venting events
• UL94 V-0 rated housing and IP40 ingress protection meet under-hood mechanical and environmental durability expectations
• 15-year design lifetime validated through accelerated life testing per JEDEC JESD22-A108G (temperature cycling) and JESD22-A110 (highly accelerated stress test)

Sample Compatibility & Compliance

The ATRS-1010-P is designed for direct mounting inside module-level enclosures or adjacent to cell vent channels in prismatic, pouch, and cylindrical Li-ion configurations. It does not require calibration against specific gas chemistries, as its function is purely physical—monitoring absolute pressure rise resulting from rapid internal gas generation (CO, CO₂, H₂, hydrocarbons) during SEI layer breakdown and electrolyte decomposition. The device complies with ISO 6469-3:2020 (safety requirements for electrically propelled road vehicles – Part 3: Protection of persons against hazards from electrical energy), and supports traceable data logging required for UN GTR 20 (Global Technical Regulation on Electric Vehicle Safety) and GB/T 31467.3–2015 (Chinese national standard for electric vehicle battery system safety evaluation). Its CAN protocol implementation includes CRC checksumming and message timeout handling to satisfy ASAM MCD-2 MC functional safety constraints.

Software & Data Management

The sensor outputs standardized CAN frames containing raw pressure (kPa), compensated temperature (°C), diagnostic status bits (e.g., sensor health, power rail stability, memory integrity), and timestamped event flags (e.g., “pressure rate-of-change threshold exceeded”). OEMs may map these signals directly into existing BMS diagnostic trouble code (DTC) tables per SAE J1939-71 or UDS (ISO 14229-1) frameworks. No proprietary software or drivers are required; configuration is performed via CAN command sequences (e.g., sleep/wake control, filter coefficient adjustment). All operational parameters—including sampling rate, alert hysteresis, and wake-up sensitivity—are non-volatile and retain settings through power cycles. Audit-ready data streams support GLP-compliant validation protocols when used in certified test labs conducting IEC 62660-2 or UL 1642 thermal abuse evaluations.

Applications

• Early-warning subsystems in traction battery packs for EVs, E-buses, and commercial HEVs
• Functional safety layers (ASIL-B capable when integrated with redundant sensors per ISO 26262-9)
• Accelerated abuse testing rigs for cell/module qualification (thermal ramp, nail penetration, overcharge)
• Stationary energy storage systems (ESS) requiring NFPA 855-compliant fire mitigation logic
• Research instrumentation for quantifying gas evolution kinetics in next-generation solid-state and sodium-ion cells

FAQ

What pressure range is the ATRS-1010-P optimized for, and why is this range critical for thermal runaway detection?
The sensor operates with highest accuracy between 50–160 kPa absolute—covering ambient atmospheric pressure (~101 kPa) plus the 50–60 kPa overpressure typically observed 2–8 seconds prior to venting in 21700 and 4680-format cells. This narrow, high-resolution window avoids saturation while maximizing signal-to-noise ratio for sub-second transient detection.

Does the sensor require periodic recalibration in field use?
No. The MEMS die features on-wafer-trimmed resistors and factory-programmed temperature compensation coefficients stored in EEPROM. Long-term drift is specified at <0.15% FS/year under continuous operation at 85 °C, eliminating need for scheduled recalibration per ISO/IEC 17025 requirements.

How does the ATRS-1010-P interface with functional safety architectures?
It provides hardware-level fault signaling (dedicated diagnostic pin) and embedded self-test routines (power-on and periodic) that report status via CAN. When deployed with two ATRS-1010-P units in voting configuration, it supports ASIL-B compliance per ISO 26262-5 Annex D guidelines for pressure-based thermal runaway detection.