Initial coolant filling is a critical commissioning milestone for liquid-cooled Battery Energy Storage Systems (BESS). Improper execution can cause severe airlocks, localized cell overheating, or catastrophic fluid leaks. Operators must strictly adhere to this standardized six-step protocol to ensure long-term thermal management reliability.

1. Pre-Check and Pressure Testing
  • Leak Detection: Conduct a 24-hour nitrogen pressure holding test (typically at 0.4–0.6 MPa) before introducing any liquid.
  • Joint Inspection: Verify all quick-connect couplings, manifold joints, and thermal insulation jackets are fully secured.
  • Media Verification: Confirm the coolant spec matches requirements (e.g., 50/50 premixed ethylene glycol and deionized water).
2. Deep System Evacuation
  • Airlock Prevention: BESS piping is extensive; filling at atmospheric pressure guarantees trapped air.
  • Vacuum Pull: Connect a heavy-duty vacuum pump to seal off the loop. Pull a deep vacuum to remove all moisture and air pocket potential.
3. Segmented Initial Injection
  • Cluster Isolation: Open valves grouping by grouping (or rack by rack) to ensure uniform fluid distribution.
  • Priming Fluid: Pump coolant into the low-point service valve until the pressure gauge reads a stable 0.6 to 1.2 Bar.
  • Bleeding Valves: Keep high-point manual bleed valves cracked open until a steady stream of fluid—free of foam—emerges.
4. Dynamic Circulation & De-Aeration
  • Pump Control: Power on the BESS Chiller/HVAC unit in "Manual Circulation Mode" (run the pump only; keep the compressor off).
  • Air Expulsion: Circulate the fluid for 15–20 minutes to force micro-bubbles out of the cold plates and into the expansion tank.
  • Pressure Monitoring: Watch for pressure drops as trapped air is displaced by the moving fluid.
5. Secondary Top-Up & Stabilization
  • Final Pressure Adjustment: Top up the system until the static pressure locks firmly between 1.2 and 1.5 Bar.
  • Level Check: Ensure the expansion tank sight glass reads precisely between the MIN and MAX thresholds.
  • System Sealing: Securely lock all manual bleed valves and disconnect the external filling rig.
6. Full-Load Commissioning
  • Active Thermal Run: Engage full heating and cooling modes to run the system under simulated operational stress.
  • Leak Detection: Monitor the container floor leak-detection cables and bilge level sensors for any moisture alarms 
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Abstract：As global energy storage projects continue to scale rapidly, owners and system integrators are facing a practical challenge: how to shorten project delivery cycles and reduce on-site installation complexity while ensuring system safety and reliability.

To address this demand, TLS introduces a Semi-Integrated Energy Storage Container solution, where key auxiliary systems are pre-installed and tested in the factory. This significantly reduces on-site workload and improves overall deployment efficiency.

This article focuses on answering the following key questions:
  • Which systems are suitable for factory pre-integration?
  • How does a semi-integrated solution shorten project delivery time?
  • How can flexible customization be achieved for different project requirements?
By understanding the design philosophy and delivery model of semi-integrated energy storage containers, users can better evaluate the most suitable solution for their projects.

1. Factory Pre-Integration: Improving Project Deployment Efficiency

On-site construction for energy storage projects is often constrained by schedule pressure, environmental conditions, and labor availability.
Through factory pre-integration, key auxiliary systems can be installed and tested in advance.

Typical Pre-Installed Systems Include:
  • HVAC (Thermal Management System)
Industrial-grade air conditioning systems are configured according to project requirements, ensuring a stable operating environment for battery systems.
  • Fire Suppression System (Project-Specific Configuration)
Fire detection and suppression systems can be pre-installed or reserved based on customer requirements, enhancing overall system safety.
  • Lighting System
Internal lighting systems support inspection, maintenance, and daily operational management.
Compared with on-site installation, factory pre-integration ensures higher consistency and significantly reduces installation time at the project site.

2. From Design to Delivery: A Complete Project Execution Workflow

The success of an energy storage project depends not only on equipment quality, but also on execution efficiency across the entire delivery chain.
TLS provides end-to-end project support covering the full lifecycle.
System Design PhaseBased on project requirements, TLS performs:
  • Container layout design
  • Thermal management system planning
  • Electrical interface design
  • Auxiliary system configuration
This ensures full alignment with real application scenarios.

Manufacturing and Integration PhaseIn the factory, TLS completes:
  • HVAC installation
  • Cable tray installation
  • Power distribution pre-arrangement
  • Fire system pre-integration
  • Structural component assembly
This improves manufacturing quality and ensures consistent delivery standards.

Factory Acceptance Testing (FAT)Before shipment, system validation tests are conducted, including:
  • HVAC performance testing
  • Electrical system inspection
  • Auxiliary equipment functionality checks
This significantly reduces commissioning risks at the project site.

3. Flexible Customization for Different Energy Storage Projects

Energy storage projects vary widely in technical requirements, including:
  • Different battery technologies
  • Different electrical architectures
  • Different environmental conditions
  • Different owner standards

Therefore, energy storage containers must offer strong customization capabilities.

TLS Supports Flexible Adjustments in the Following Areas:Container Size and Layout
​
Optimized internal space design based on equipment dimensions and maintenance requirements.
  • HVAC Configuration
Cooling or heating capacity tailored to local climate conditions.
  • Fire Protection System Design
Customized fire safety solutions based on project specifications.
  • Electrical and Communication Interfaces
Compatible with different PCS, EMS, and BMS integration requirements.

This flexibility allows a standardized platform to be adapted to a wide range of energy storage applications.

4. Balancing Efficiency and Sustainability

Energy storage systems play a key role in global energy transition.

TLS also integrates sustainability principles into its design and manufacturing process:
  • Improving energy efficiency of auxiliary systems
  • Optimizing material utilization
  • Reducing on-site construction waste
  • Supporting renewable energy infrastructure development
Through optimized engineering and manufacturing workflows, TLS helps customers achieve more efficient and sustainable project delivery.

Conclusion: Why Are More Projects Choosing Semi-Integrated Solutions?

For many energy storage projects, the real challenge is not only selecting equipment, but balancing delivery efficiency with system flexibility.

Semi-integrated energy storage containers provide this balance.

They reduce on-site installation workload through factory pre-integration while maintaining flexibility for different system configurations.

Key Selection Considerations:
  • Reduced on-site installation workload: Lower construction complexity and schedule risk
  • Fast deployment capability: Shorter project execution timelines
  • High customization flexibility: Adaptable to different technical standards
  • Factory-tested reliability: Improved quality and operational stability
  • Full project support capability: End-to-end design, manufacturing, testing, and delivery support

Through systematic engineering design, TLS semi-integrated energy storage containers evolve from traditional container products into high-efficiency project delivery platforms, providing a solid foundation for modern energy storage applications.

Keywords: #Semi-integrated energy storage container, #Energy storage system container solution, #Battery energy storage container HVAC integration,#Factory pre-integrated ESS container,#Energy storage container FAT testing,#Modular energy storage system design,#Rapid deployment energy storage solution,#Customized battery storage container,#TLS energy storage container solution,#Turnkey energy storage container system

Written by Snowy

In experimental and testing environments involving hazardous chemicals, toxic gases, biological samples, or special industrial media, risk control remains a critical design priority for any laboratory system.

During the planning stage of such projects, several essential questions are often raised:
  • Why can negative pressure laboratory containers prevent hazardous substances from leaking outward?
  • Is negative pressure alone sufficient to guarantee laboratory safety?
  • What external environmental factors must be considered during deployment?
  • What safety protection mechanisms should a reliable negative pressure laboratory container include?
In reality, the safety performance of a negative pressure laboratory container depends not only on pressure control itself, but also on environmental assessment, operational management, and emergency response capability.

1. Why Are Negative Pressure Laboratory Containers Increasingly Important?

In many industrial and research scenarios, laboratory processes may involve:
  • Toxic and hazardous gases
  • Volatile chemical substances
  • Corrosive media
  • Industrial dust
  • Biological contaminants
Once released into the external environment, these substances can pose serious risks to personnel safety, equipment integrity, and environmental protection.
Therefore, the core objective of laboratory design is not to prevent external intrusion, but to ensure that internal risks do not spread outward.
This is the fundamental value of negative pressure laboratory containers.
Simply put:
  • Positive pressure systems prevent external hazards from entering.
  • Negative pressure systems prevent internal hazards from escaping.

2. How Does a Negative Pressure Laboratory Container Work?

A negative pressure laboratory container maintains an internal pressure lower than the surrounding environment through continuous exhaust ventilation.
Under this condition:
  • External air enters the laboratory through designated intake paths
  • Internal air is continuously exhausted through controlled outlets
  • The airflow direction remains stable and predictable
This unidirectional airflow design effectively prevents contaminants from escaping.
Its key benefits include:
  • Prevention of hazardous substance leakage
  • Reduced cross-contamination risk
  • Improved experimental stability
  • Enhanced emergency handling capability

3. Why External Environmental Conditions Also Matter

Many assume that maintaining negative pressure alone is sufficient for safety. However, this is not the case.
Even the most advanced negative pressure system is influenced by external environmental conditions.
Therefore, before deployment, the following assessments are typically required:
1. Site Risk Evaluation: Avoid locations near pollution sources or high-risk industrial processes.
2. Environmental Monitoring: Ensure ambient air quality meets safety requirements and contains no abnormal hazardous gases.
3. Safety Isolation Measures: Establish buffer zones or isolation areas when necessary to reduce external interference.
4. Continuous Monitoring: Implement long-term environmental monitoring systems to detect potential risks in time.

From an engineering perspective, a safe laboratory must manage both internal and external environments.

4. Why Personnel Training and Management Are Equally Critical

Even the most advanced system requires correct operation.
Operators of negative pressure laboratory containers should be trained in:
  • Working principles of negative pressure systems
  • Standard operating procedures
  • Alarm response protocols
  • Emergency handling procedures
  • Basic maintenance and inspection methods
Only through the combination of equipment safety and operational discipline can overall system reliability be ensured.

5. How TLS Negative Pressure Laboratory Containers Enhance Safety

In the design of TLS negative pressure laboratory containers, safety is achieved not only through pressure control, but also through multi-layered emergency protection mechanisms.

Normal Operating Mode

During standard operation:
  • Small fans operate continuously
  • Internal pressure is maintained at approximately -30 Pa to -40 Pa
  • Meets routine laboratory ventilation and safety requirements

Emergency Operating Mode

When the system detects:
  • Combustible gas alarms
  • Hydrogen sulfide (H₂S) threshold alarms
The system automatically responds:
  • Emergency high-capacity fans activate
  • Internal pressure can drop to approximately -130 Pa
  • Rapidly increases exhaust capacity to remove hazardous gases

Automatic Protection Mechanism

If hazardous gas concentration continues to rise:
  • High-level alarm is triggered
  • Sound and light warnings are activated
  • If conditions persist beyond the set threshold, the system automatically cuts off power
This layered logic—monitoring, alarm, ventilation, and shutdown—forms a comprehensive safety protection chain that significantly reduces the risk of escalation.

Conclusion: Negative Pressure Laboratories Are a System-Level Safety Solution

The value of a negative pressure laboratory container lies not only in creating a pressure differential, but in establishing a complete risk control system.

When selecting or designing such systems, key focus areas should include:
  • Pressure stability: Long-term and consistent negative pressure maintenance
  • Environmental adaptability: Consideration of site-specific external risks
  • Emergency response capability: Automated alarms, ventilation, and interlock systems
  • Operational management system: Standardized procedures for long-term safe operation

For projects involving hazardous gases, chemicals, or specialized experimental environments, negative pressure laboratory containers are not just ventilation systems—they are critical infrastructure for ensuring personnel safety, experimental integrity, and environmental protection.

Through integrated pressure control, gas detection, automatic interlocking, and modular engineering design, TLS provides safer and more reliable negative pressure laboratory container solutions, enabling stable operation even in complex and high-risk environments.
​Please download the Laboratory container brochure for reference.

Keywords：#Negative pressure laboratory container, #Laboratory safety system, #Hazardous gas containment solution, #Modular laboratory container, #Industrial mobile laboratory, #Emergency ventilation system, #H2S gas detection system, #Explosion-proof laboratory container, #Controlled airflow laboratory design, #TLS container laboratory solution

Written by Snowy