Korean Data Center Fire Heightens the Need for Improved Li-ion Battery Safety
At 8:20 p.m. on Friday, September 26, in Daejeon City 85 miles from Seoul a devastating data center fire caused the shutdown of hundreds of online government services in South Korea. Investigations suggest the cause was a lithium-ion (Li-ion) battery explosion, leading to an uncontrollable thermal runaway in a room containing almost two hundred battery packs. This tragic event underscores the growing urgency for enhanced Li-ion battery safety, especially as global data centers and energy storage facilities expand rapidly.
Understanding Li-ion Battery Thermal Runaway
Thermal runaway occurs when exothermic reactions inside a battery cause the temperature to rise uncontrollably, igniting flammable gases or liquids. Once triggered, it can spread from cell to cell within seconds and from pack to pack within minutes. In facilities like the Daejeon data center housing hundreds of packs and thousands of cells the consequences can be catastrophic, affecting not just safety but also data security and financial stability.
Rising Battery Fire Incidents in South Korea
According to the National Fire Agency of South Korea, there were 296 battery-related fire incidents in the first half of 2025 alone, causing 23 injuries and an estimated ₩22.4 billion in damages. If this trend continues, 2025 may surpass the 543 total cases recorded in 2024.
One of the deadliest incidents occurred in June 2024 at an Aricell lithium battery factory in Hwaesong, where 23 workers died. Investigations revealed poor compliance with safety standards, leading to public outrage and the CEO’s resignation. These repeated incidents emphasize that despite progress, Li-ion battery safety still faces serious gaps in implementation and oversight.
Regulatory Challenges and Data Center Growth
With the surge in AI adoption and cloud computing, data center energy demand has soared to approximately 75 GW in 2025, expected to triple within a decade. To reduce emissions, many facilities now use Battery Energy Storage Systems (BESS) alongside renewable energy sources.
However, regional BESS safety standards vary widely.
- The U.S. enforces UL standards under NFPA codes.
- Europe requires CE marking, but testing is self-certified.
- China recently introduced the groundbreaking GB 38031-2025 “no fire, no explosion” rule for EV batteries, set to take effect in July 2026.
Yet, no globally unified regulation exists for Li-ion battery safety in data centers leaving gaps in prevention and protection.
Improving Battery Safety: Key Solutions
1. Enhanced Thermal Management
Advanced cooling systems, fire suppressants, and thermally resistant materials such as ceramics and insulating foams help prevent heat buildup. Liquid-cooled designs and passive fire barriers can limit the spread of thermal runaway. These methods, already used in high-power computing facilities, are essential for Li-ion battery safety in large data centers.
2. Better Monitoring and Diagnostics
AI-driven battery management systems can monitor state of health (SoH) and detect anomalies before failure. Integrating gas, pressure, and humidity sensors allows early warning up to 25 minutes before combustion providing critical time for response.
3. Exploring Safer Alternatives
Technologies like Redox Flow Batteries (RFBs) and solid-state batteries offer non-flammable electrolytes and higher thermal stability. Although costlier, these alternatives could replace Li-ion systems in high-risk environments such as data centers.
Outlook: The Path Toward Safer Energy Storage
Li-ion batteries are not inherently safe due to their flammable electrolyte. Still, through improved diagnostics, robust fire protection, and global safety standards, catastrophic incidents can be prevented. China’s 2026 EV regulation is a promising model, but the BESS sector must adopt similar global standards to prevent events like the Daejeon fire from recurring.
As battery adoption accelerates, a coordinated approach combining technology, regulation, and transparency is essential for a safer and more sustainable energy future.
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