Yuelian YL-A-8000E Walk-in Environmental Chamber for Battery Thermal and Humidity Cycling Testing

Overview

The Yuelian YL-A-8000E is a walk-in environmental test chamber engineered specifically for thermal and humidity cycling validation of high-voltage battery packs and energy storage systems under IEC 62660-2, GB/T 31467.3, and GB/T 2423.4 (Test Db) protocols. It operates on a dual-loop precision control architecture combining forced-air convection with direct-expansion refrigeration and steam-based humidification, enabling stable, reproducible simulation of extreme climatic conditions—from −50 °C dry cold to +100 °C high-heat and up to 98 %RH saturated environments. Designed for full-system evaluation, the chamber accommodates battery modules weighing 100–2000 kg, supporting real-time monitoring of voltage, surface temperature, and ambient parameters during dynamic thermal ramping. Its structural integrity and safety-critical subsystems meet industrial requirements for EV battery qualification in R&D, production line validation, and third-party certification labs.

Key Features

• Robust monolithic construction with 2.5 mm thick cold-rolled steel outer shell (gray epoxy-coated) and 2.0 mm SUS#304 stainless steel inner chamber—corrosion-resistant, non-outgassing, and compliant with cleanroom-grade maintenance standards.
• Quadruple-layer heated anti-condensation observation window using tempered laminated glass with integrated electrically heated film—ensures unobstructed visual inspection under high-humidity conditions without fogging or thermal distortion.
• High-efficiency refrigeration system featuring dual-stage GEA Bitzer compressors (Germany-sourced), low-GWP R404A/R23 cascade refrigerant circuitry, and optimized finned-tube evaporator design for consistent cooling performance at full load.
• Precision humidity generation via stainless-steel steam generator with PID-controlled water level and deionized water feed—minimizes mineral deposition and ensures long-term RH stability across 20–98 %RH range.
• Integrated safety architecture including Class II explosion-proof wiring, redundant overtemperature cutoffs (mechanical + electronic), smoke detection with activated carbon filtration (optional), and real-time leakage current monitoring per IEC 61000-4-5.

Sample Compatibility & Compliance

The YL-A-8000E supports battery pack testing per major international and national standards, including GB/T 2423.4 (Test Db), ISO 16750-4, UN ECE R100, and SAE J2464 Annex C. Its 200 × 200 × 200 cm working volume accommodates modular lithium-ion battery enclosures up to 1.8 m tall and 1.2 m wide, with provisions for external busbar feedthroughs and high-voltage isolation terminals. The chamber’s thermal uniformity (≤2 °C) and humidity uniformity (±3 %RH above 75 %RH) are validated per ASTM E744 and IEC 60068-3-5, ensuring data traceability for GLP/GMP-regulated test reports. Optional data logging meets FDA 21 CFR Part 11 audit trail requirements when paired with Yuelian’s certified software package.

Software & Data Management

Control and data acquisition are managed via a 10.4″ color touchscreen HMI running embedded Linux OS with real-time multi-channel logging (up to 32 analog inputs). Standard firmware supports programmable ramp-soak profiles, event-triggered alarms, and automatic report generation in PDF/CSV formats. Optional Ethernet-enabled SCADA integration allows remote supervision through Modbus TCP or OPC UA protocols. All recorded parameters—including chamber setpoints, actual temperatures/humidity, sample surface thermocouple readings, and safety interlock status—are time-stamped with microsecond resolution and stored with SHA-256 checksum integrity verification. Audit trails include user login history, parameter modification logs, and calibration certificate timestamps—fully aligned with ISO/IEC 17025 documentation requirements.

Applications

• Thermal runaway propagation studies under controlled humidity gradients
• Accelerated aging of battery management system (BMS) electronics under cyclic condensation stress
• Validation of sealing integrity and gasket performance across −40 °C to +85 °C transitions
• Insulation resistance decay analysis pre- and post-humidity exposure (per GB/T 31467.3 Clause 6.3.2)
• Pre-compliance screening for UN 38.3 T5 (thermal test) and IEC 62133-2 mechanical/thermal abuse sequences
• Environmental stress screening (ESS) of traction battery assemblies prior to vehicle-level integration

FAQ

What is the maximum battery pack weight supported inside the YL-A-8000E chamber?

The chamber is rated for static loads up to 2000 kg, with reinforced floor structure and adjustable leveling feet designed for uneven weight distribution typical of large-format EV battery modules.
Can the chamber perform simultaneous temperature and humidity ramps as required by GB/T 2423.4 Test Db?

Yes—the controller executes synchronized linear or stepwise profiles for both temperature and relative humidity, with independent PID tuning for each loop and cross-coupling compensation to minimize overshoot during transition phases.
Is the refrigeration system compatible with low-global-warming-potential (GWP) refrigerants?

The standard configuration uses R404A/R23 cascade refrigerants; however, retrofit options for R513A or R1234ze(E) are available upon request and subject to compressor compatibility verification.
Does the chamber include built-in voltage and temperature monitoring interfaces for battery DUTs?

Standard configuration includes 8-channel isolated analog inputs (±10 V, 16-bit resolution) with terminal blocks for external thermocouples and voltage probes; additional channels can be added via optional expansion modules.
How is calibration traceability maintained for temperature and humidity sensors?

All PT100 sensors and capacitive RH transducers are factory-calibrated against NIST-traceable references; calibration certificates (ISO/IEC 17025 accredited) are supplied with each unit and include uncertainty budgets per ANSI/NCSL Z540.