"SAFETY GO NORD" Exclusive Interview | Witness How ANPL Safeguards Energy Storage Safety.

2024-01-30 14:42
"Amid the explosive growth of energy storage grid-connected projects, after the fervor has subsided, it has prompted more reflections on the high-quality and safe development of the industry.

Against this backdrop, ANPL was invited to participate in an exclusive interview for the "SAFETY GO NORD Safety Guidance" program initiated by TÜV NORD, sharing the efforts the company has made in the field of energy storage safety. Li Tao, Senior Product Manager of ANPL's Product Department, provided a detailed overview from five dimensions."

 Li Tao, Senior Product Manager of ANPL

#01 Battery Cell Level Protection 

Aerogel Thermal Insulation: Aerogel, the same thermal insulation material used in Mars rovers, is employed for thermal insulation protection around the battery cells. This effectively prevents heat diffusion between adjacent modules when an individual cell experiences thermal runaway, buying time for fault interruption.

Data Collection: The Battery Management System (BMS) collects data such as voltage and temperature from individual battery cells, transmitting real-time data to collaborate with the BMS master control for "one cluster, one management."

Incoming Material Inspection: ANPL implements strict supplier admission standards, testing parameters such as pressure difference, internal resistance, and capacity of battery cells to ensure their consistency. Through sampling, compression tests, puncture tests, and aging experiments are conducted to verify the safety performance of the battery cells under harsh conditions and unexpected failure scenarios.

#02 PACK-Level Protection 

Structural Safety: The newly upgraded PACK box design, validated through multiple experiments, achieves an IP65 protection rating. It can be immersed in 1 meter deep water for half an hour without leakage, effectively addressing issues related to condensation and salt spray, ensuring the safety of battery cells. Additionally, an explosion-proof valve design is employed to release excess internal pressure promptly, preventing explosions.

Electrical Safety: The fuse in the PACK box can cut off the power supply in the event of a short circuit during use, storage, assembly, or transportation, preventing safety incidents. An integrated flexible circuit design is used for electrical connections and short-circuit protection within the module, simplifying the wiring harness between batteries to mitigate the risk of short circuits caused by wiring processes.

Fire Safety: The PACK-level fire module is sourced from a leading supplier of fire-resistant materials, with a CNAS-type inspection report. It incorporates an aerosol fire module and a sampling feedback loop for automatic fire suppression through self-perception triggered by heat.

Thermal Management: The integrated liquid cooling thermal management system for PCS and battery compartments effectively enhances charging and discharging efficiency. By controlling the temperature difference of the battery cells within 2-3°C through liquid cooling, the system prevents the faster degradation of some cells, known as the "barrel effect." Precise control of the battery cell temperature within the optimal range of 20-30°C is achieved by setting the outlet temperature of the liquid cooling system, thereby extending the battery's lifespan.

#03 Battery Compartment-Level Protection 

Electrical Safety: The fuse with short-circuit protection design inside the high-voltage box aims to safeguard the overall safety of the DC side. It is designed to promptly cut off the power supply in the event of a short circuit during use, storage, assembly, or transportation, preventing safety incidents.

Fire Safety: The system-level fire module utilizes fire-resistant materials from a leading industry supplier. The fire suppression device, upon receiving an electrical start signal or in a dual-trigger mode with heat-sensitive wire ignition, activates the aerosol generator inside the device. The aerosol generator, through heat released by the exothermic reaction of the chemical cooling agent, decomposes, achieving fire suppression with both aerosol generator and cooling agent participation.

Multiple Sensors: Smoke, CO, and temperature sensors at the top, along with a water immersion sensor at the bottom of the battery compartment, accurately perceive the environmental conditions of the system in extreme situations such as fire, battery liquid cooling pipe leakage, or cabinet water leakage. This enables timely measures to be taken.

#04 System Data Monitoring 

Software Control Logic: Based on data collected by the Battery Management System (BMS), such as voltage, current, and temperature, protective measures are implemented through software control logic to ensure that the system always operates within a safe and reasonable range.

Hardwired Signal Monitoring: As a local hardware safety feature in the event of a software logic failure, the main circuit is cut off to prevent safety incidents.

Edge Controller Protection: Data aggregation for localized computation reduces cloud service costs and prevents data loss during error events. The system collaborates with factory loads, photovoltaics, and real-time electricity prices to determine the optimal strategy for system operation. Serving as the "brain" of the energy storage station, it conducts localized system safety control.

Fire Linkage Protection: Based on abnormal information collected by the BMS, such as fire, smoke detection, temperature sensing, CO levels, water leakage, emergency stops, etc., the system disconnects for electrical protection during emergency situations and notifies the fire protection system for linkage protection.

#05 Cloud Data Monitoring 

Monitoring of Core Device Health: Real-time collection, recording, rationality checks, and status analysis of parameters such as settings, alarm states, protection actions, charge/discharge events, cell capacity, and status during the operation of the energy storage system.

Big Data Security Vulnerability Warning: Combining variables such as current, voltage, internal resistance, temperature, and cycle count to diagnose the State of Health (SOH) of the battery system, utilizing big data for proactive prediction of potential risks.

Battery Intelligent Control: Intelligent power scheduling, charge/discharge strategies, and battery safety assurance techniques are implemented based on the collected parameters to enhance the availability of battery capacity and ensure the overall security of the system.

Automatic Alarm Reminders: Automatic alarms are triggered when safety thresholds are met, based on data uploaded locally by the Energy Management System (EMS). Operations personnel can efficiently address issues according to the system-displayed fault content and fault severity.

Intelligent Work Order Dispatch: Based on the urgency of faults, the system can intelligently dispatch work orders, automatically creating and documenting work order processes, fault cause analysis, and troubleshooting methods. Historical data is retained for query purposes, contributing to the accumulation of sample data for product iterations.

Planned Intelligent Operations and Maintenance (O&M): Periodic State of Charge (SOC) calibration is conducted at predetermined intervals, implementing single-cluster deep charging/discharge without the need for manual intervention. This effectively enhances the lifespan of the energy storage system.

Since its inception, ANPL has made "safety" its core mission, firmly committing to a path of steady and long-term development. With the support of the publicly listed company, Kale Group, and over a decade of profound experience in the industrial and commercial service sector, ANPL has been able to wholeheartedly dedicate itself to the research and development of energy storage products.

As Manager Li emphasized, ANPL upholds the safety bottom line from the secure design of individual battery cells to intelligent management in the cloud. This commitment ensures that ANPL's energy storage products operate in a manner that is not only safer but also more stable and longer-lasting.