Precision Temperature Control · Rapid Thermal Cycling · Explosion-Proof Safety Systems
Industry Challenges
1. Battery Thermal Runaway & Thermal Safety Failure Risks
Under extreme abuse conditions such as overcharging, short-circuiting, mechanical crushing, or high ambient temperatures, lithium-ion batteries are highly susceptible to localized thermal runaway, which can lead to catastrophic pack-level fire and explosion. Verifying the thermal safety boundaries and thermal runaway propagation (TRP) mitigation capabilities of battery systems under wide operating temperatures and extreme thermal limits remains a paramount safety challenge for the industry. Furthermore, the severe temperature cycling (-40°C to +85°C) induced by fast high-rate charging and discharging imposes continuous cumulative fatigue on battery active materials, sealing structures, and the joint strength of electrical interconnects.
2. Complex Environmental Sensitivity Of electronic Control Modules
As the core controllers of the vehicle, the Electronic Control Unit (ECU), Battery Management System (BMS), and Motor Control Unit (MCU) operate under harsh duty cycles, transitioning frequently between sub-zero cold starts (-40°C) and high-temperature full-load conditions (+125°C). Under these severe thermal cycles, the coupling of temperature, humidity, and vibration (tri-axis combined stress) accelerates solder joint creep fatigue, induces dielectric insulation degradation, and triggers sensor signal drift, severely compromising vehicle control stability and functional safety.
3. Fretting Corrosion and Environmental Degradation of Automotive Connectors
Automotive connectors, fasteners, and metallic enclosures are chronically exposed to highly corrosive environments, including road salt spray, de-icing agents, and high humidity. Driven by the combined effects of vehicle vibration and moisture, these components are highly prone to fretting wear and electrochemical corrosion. Even minor localized corrosion can cause a spike in contact resistance, severe high-frequency signal attenuation, or intermittent open circuits, directly threatening the electrical safety and system reliability of both low-voltage control networks and high-voltage power domains.
4. Compressed Development Cycles vs. Stringent Automotive Qualification Standards
With the rapid compression of vehicle development and time-to-market (TTM) cycles, engineering teams face the dual challenge of accelerated timelines and escalating standards. Concurrently, automotive qualification and reliability standards (such as AEC-Q100 and ISO 16750) continue to demand greater coverage and harsher environmental profiles. Executing a comprehensive suite of highly accelerated life testing (HALT) and environmental reliability validation within a highly constrained development window has become a critical bottleneck for OEM R&D and quality assurance departments.
Compliance Standards
1. Traction Battery Safety & Reliability Standards
| GB 38031-2020 | UN ECE R100 (Revision 2/3) | UL 2580 | GB/T 31485-2015 | IEC 62660-3 & SAE J2464 | |
|---|---|---|---|---|---|
| Safety requirements for traction batteries of electric vehicles | UN Regulation on uniform provisions concerning the approval of vehicles with regard to specific requirements for the electric power train | Standard for Batteries for Use in Electric Vehicles | Safety requirements and test methods for traction batteries of electric vehicles | Secondary lithium-ion cells for the propulsion of electric road vehicles / Electric and Hybrid Vehicle Propulsion Battery System Crash Hazard Prevention and Testing | |
| Applicable Tests | Thermal Runaway (TR) Thermal Runaway Propagation (TRP) Over-temperature Protection |
Pack/System-level Thermal Runaway Thermal Runaway Propagation (TRP) Mitigation. |
Thermal Runaway Overcharging External Short Circuit Thermal Cycling |
Overcharge Over-discharge Short Circuit Mechanical Crushing Thermal Runaway (Heating-induced) |
Thermal Abuse Thermal Shock Temperature Cycling Short Circuit |
2. Automotive Electronics & Control Systems Standards
| ISO 16750-2 / -4 | AEC-Q100 (AEC-Q101/Q200) | |
|---|---|---|
| Road vehicles - Environmental conditions and testing for electrical and electronic equipment (Part 2: Electrical loads / Part 4: Climatic loads) | Stress Test Qualification for Automotive-Grade Integrated Circuits | |
| Applicable Tests | High/Low-Temperature Storage & Operation Rapid Rate Temperature Change (thermal cycling) Damp Heat Cyclic High-Temperature Endurance |
Highly Accelerated Temperature and Humidity Stress Test (HAST) Temperature Cycling (TC) Temperature Humidity Bias (THB) High/Low-Temperature Storage Life (HTSL/LTSL) |
3. Components, Sensors & Connectors Environmental Standards
| ASTM B117 / ISO 9227 (GB/T 2423.17) | IEC 60068-2-14 (GB/T 2423.22) | ISO 11997-1 / -2 | |
|---|---|---|---|
| Standard Practice for Operating Salt Spray (Fog) Apparatus / Corrosion tests in artificial atmospheres | Environmental testing - Part 2-14: Tests - Test N: Change of temperature | Paints and varnishes - Determination of resistance to cyclic corrosion conditions (Part 1: Wet/cyclic / Part 2: Dry/cyclic with UV exposure) | |
| Applicable Tests | Neutral Salt Spray (NSS) Acetic Acid Salt Spray (AASS) Copper-Accelerated Acetic Acid Salt Spray (CASS) Corrosion Testing |
Two-zone/Three-zone Air-to-Air Thermal Shock Rapid Temperature Change (ESS). |
Accelerated Cyclic Corrosion Testing (CCT) combining salt spray wet/dry transitions temperature cycling UV exposure for automotive chassis connectors battery pack enclosures |
Recommended Test Chambers
Explosion-Proof Temperature & Humidity Test Chamber
Engineered for traction battery thermal abuse and cycling validation, featuring integrated explosion-proof relief valves, multi-gas detection, and active fire suppression to ensure failsafe testing.
Rapid Rate Temperature Cycling (ESS) Chamber
Delivers rapid thermal transitions up to 20°C/min between -40°C and +125°C, designed to precipitate early-stage latent defects in BMS and power electronics.
Temperature, Humidity & Vibration Combined Chamber
Replicates complex road environments by synchronizing temperature, humidity, and multi-axis vibration profiles to validate battery modules and electric drive systems.
Cyclic Corrosion Test (CCT) Chamber
Fully compliant with ISO 11997 and VDA standards, supporting NSS, AASS, CASS, and complex dry/wet cyclic corrosions to evaluate the long-term rust resistance of automotive connectors and sensors.
Technical Advantages & Safety Options
I. Explosion-Proof & Active Safety Systems (For Traction Battery Testing)
Introduction
To address the stringent fire and explosion risks in thermal runaway testing of power batteries, our explosion-proof constant temperature and humidity test chamber integrates innovative multiple active and passive safety systems to ensure process safety and full controllability under extreme testing conditions.
1. Structural Explosion-Proof & Relief Systems
Explosion-Proof Safety Door System
Overpressure Self-Releasing Door: Designed to automatically pop open under transient pressure buildup during a thermal runaway event, effectively dissipating shockwaves to prevent structural damage to the chamber.
Heavy-Duty Safety Chains: Equipped with four high-tensile 12mm steel chains to tether the door, preventing it from swinging open aggressively under blast impact, thus protecting operators while maintaining chamber integrity.
Window Steel Mesh Guard: A heavy-duty metallic mesh is reinforced over the tempered explosion-proof glass viewport to intercept high-velocity flying debris.
Active Blast Pressure Relief System
1. Customizable Relief Vents: Position, quantity, and specifications of the explosion relief vents can be tailored to specific test volumes and battery capacities.
2. Pressure-Triggered Auto-Venting: The relief port instantly actuates upon detecting a rapid pressure spike, safely exhausting high-temperature high-pressure gases and neutralizing destructive internal pressure.
3. Anti-Projectile Guard Frame: Built-in restraining frames secure the relief vent plugs, preventing them from acting as projectiles when blown open.
4. Precision Calibrated Relief Threshold: The venting pressure is strictly calibrated to trigger at 0.104MPa, ensuring controlled energy release and zero-hazard boundaries beyond a 5m radius of the chamber.
2. Independent Over-Temperature Protection & Fire Suppression
Independent Over-Temperature Protection (OTP) System
1. Physically Isolated Controller: Features a secondary over-temperature controller completely separate from the main PLC, powered by its own dedicated thermocouple.
2. Sub-Second Power Cutoff (≤1s): Automatically cuts off heating element power within 1s of detecting any abnormal temperature spike, halting thermal propagation.
3. Triple Redundant Safety: Designed with a three-tier thermal limit redundancy to completely eliminate runaway heating risks even if the primary control system suffers a catastrophic failure.
Intelligent Interlocking Fire Suppression System
1. Dual-Parameter Detection: Equipped with high-sensitivity smoke and temperature sensors at the chamber ceiling to monitor fire signatures.
2. 3-Tier Interlocking Action:
Stage 1 (Alert): Single-sensor alarm → Triggers visual-audible warnings and performs an automatic emergency system shutdown.
Stage 2 (Suppression): Dual-sensor confirmation (both smoke & temp) → Automatically actuates the fire extinguishing valve.
Stage 3 (Manual Override): Combined logic of continuous sensor monitoring and manual physical override buttons to eliminate false alarms while guaranteeing absolute response.
3. Clean-Agent Media: Supports eco-friendly clean agents such as CO2 or FM-200 (Heptafluoropropane), extinguishing flames rapidly with zero residue, protecting valuable DUT (Device Under Test) and chamber circuitry.
Multi-Tier Visual-Audible Alarm System
High-Decibel Multi-Point Alarms: Employs synchronous flashing beacons and high-penetration sounders (≥85dB) to ensure immediate visibility and audibility in loud industrial environments.Classified Alarm Management: Categorizes events into "Warning, Alarm, and Emergency" levels, executing distinct hazard mitigation and shutdown sequences for each.IoT Remote Notifications (Optional): Can be equipped with cellular/Wi-Fi modules to send real-time SMS/Email alert notifications directly to supervisors.
II. High-Precision Control & Data Traceability
Ultra-Precise Temperature & Humidity Control：
Temperature deviation ≤±0.5℃; Humidity deviation ≤±2%RH, significantly outperforming GB/T 2423 and ISO 16750 criteria.
Dynamic Fast Temperature Change Rates (ESS)：
Offers flexible, programmable ramp rates from 1℃/min~20℃/min (linear or non-linear configurable) to satisfy severe thermal cycling tests.
24-Bit High-Resolution Data Acquisition：
Integrates a 24-bit high-resolution AD converter for non-stop, tamper-proof logging of temperature, humidity, pressure, gas concentrations, and comprehensive alarm logs.
LIMS Integration & Digital Compliance：
Seamlessly interfaces with Laboratory Information Management Systems (LIMS), adhering strictly to GB 38031, ISO 16750-2, and FDA 21 CFR Part 11 for electronic records integrity.
Audit Trail & Multi-Level User Authorization：
Provides comprehensive electronic audit trails and multi-tier user role access (Administrator, Technician, Operator), fulfilling the strict trace-and-track requirements of AEC-Q100.
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Accelerate your road to automotive qualification. If you are seeking highly matched environmental test simulation for traction battery thermal abuse assessment, rapid thermal stress screening for electronic control units (ECU/BMS), or cyclic corrosion evaluation for automotive interconnects, please share your testing profiles below. Our application engineering team will deliver a comprehensive technical proposal, laboratory layout planning, and a standard-compliance cross-reference matrix within 24 hours.
