Methods To Extinguish Lithium Ion Battery Fires
Lithium battery fire is a dangerous safety hazard, which is essentially different from ordinary fires. Understanding how to extinguish lithium battery fires and what to do about them is crucial to staying safe. This article will introduce in detail the causes of lithium battery fires, why it is difficult to extinguish them with ordinary fire extinguishers, and the correct response methods.
What are the causes of lithium battery fires?
Thermal runaway phenomenon
- The main cause of lithium battery fires is thermal runaway, which is a cascading failure process that occurs inside the battery.
- During thermal runaway, the initial trigger causes the internal battery temperature to rise rapidly. The temperature increase accelerates chemical decomposition within the electrolyte, generating additional heat and flammable gases. The thermal runaway reaction can increase the internal battery temperature to more than 600 degrees Celsius in a few seconds.
Common triggers
- Overcharging or using the wrong charger can produce inconsistent voltage or current levels, increasing the risk of fire.
- Physical damage such as impact, puncture or crushing may damage the internal structure of the battery and cause a short circuit.
- High ambient temperatures accelerate chemical reactions within the battery, potentially triggering thermal runaway even if the battery is otherwise healthy.
Battery aging risk
- As lithium batteries age, their internal resistance increases and their ability to manage thermal stress decreases.
- Batteries near the end of their design life are more susceptible to thermal runaway events even under normal operating conditions.
- Prolonged exposure to high temperatures increases risks, and regular inspection and replacement of old batteries are important safety measures.
Charging related hazards
- Charging-related accidents account for approximately the majority of lithium battery fires and are the most common cause of fires.
- Do not charge the battery overnight or when going out to avoid leaving it unattended.
- You should use the charger that comes with your device or a charger of the same brand. Using a high-quality charger can provide stable current and prevent overcharging.
Why is it difficult for standard fire extinguishers to extinguish lithium battery fires?
The particularity of lithium battery fire
- Lithium battery fires, unlike typical fires, have a self-sustaining internal reaction, and standard fire extinguishers cannot effectively interrupt this process.
- Batteries release toxic gases that cannot be neutralized by standard fire extinguishers and may cause poisoning if inhaled.
- Standard fire extinguishers can only cool external flames and cannot prevent internal reactions, posing a risk of re-ignition.
Limitations of different fire extinguishers
- Carbon dioxide fire extinguishers suppress external flames by displacing oxygen, but cannot penetrate the battery or prevent thermal runaway.
- Dry chemical fire extinguishers suppress surface flames, but lack cooling of the internal battery and leave residue that can damage electronic equipment.
- The flame may re-ignite quickly because internal reactions are still continuing and ordinary fire extinguishers have limited effectiveness on lithium battery fires.
Toxic gas hazards
- When lithium batteries burn, they release a variety of toxic gases, including harmful substances such as carbon monoxide and hydrogen fluoride.
- These toxic gases are seriously harmful to the human respiratory system, and inhalation may cause poisoning symptoms.
- When dealing with lithium battery fires, a safe distance must be maintained and protective equipment must be worn.
Relapse risk
- Lithium battery fires have extremely high re-ignition characteristics. Even if the surface flame is extinguished, the internal thermal runaway reaction may still be ongoing.
- Re-ignition may occur hours or even days after the fire is extinguished, causing secondary disasters.
- Continuous cooling and monitoring are key measures to prevent re-ignition.
How to effectively extinguish lithium battery fires?
Use special encapsulants
- Special encapsulant is one of the most effective modern solutions and is a special additive mixed with water.
- This additive dissipates heat quickly, cooling the battery to a safe temperature before it reignites.
- Encapsulant encapsulates flammable vapors, making them unable to ignite while reducing the production of toxic fumes.
Use an aerosol fire extinguisher
- Aerosol-based suppression systems such as aerosol fire extinguishers use potassium-based compounds that release fine particles and gases.
- These substances can interrupt the chemical chain reaction within the fire and quickly inhibit the spread of flames.
- Aerosol fire extinguishers can extinguish single-cell and multi-cell fires in a few seconds and are an important development in modern fire-fighting technology.
Use fire blanket
- Fire blankets specifically designed for lithium batteries suppress flames and block radiant heat.
- Useful for controlling smaller fires such as laptop or equipment fires such as e-bikes.
- However, a fire blanket does not eliminate the root cause of thermal runaway and should be used as a temporary measure until professional help arrives.
Emergency handling methods
- Stay safe first, evacuate and seek assistance, always put safety first.
- If a fire is large or uncontrollable, flee the area immediately and notify the fire department.
- Smaller lithium-ion batteries can be extinguished by soaking in water or submerging in a bucket of water, the key is to cool the battery and prevent thermal runaway from proceeding.
How to prevent lithium battery fires?
Correct charging method
- Use the charger that comes with the device or a charger of the same brand, and do not charge the battery overnight or while out and about.
- Keep the charging area ventilated and avoid charging in confined spaces.
- Use a high-quality charger to provide a stable current and prevent overcharging. Charging should be done unattended.
Correct storage method
- Store batteries in a cool, dry place, preferably between 5 and 20 degrees Celsius.
- Do not leave the device on the dashboard or near a heater to avoid exposure to high temperatures.
- For long-term storage, the battery should be kept partially charged, approximately 50% charged, and the battery status should be checked regularly.
safety warning signs
- Watch for bulging, cracked or leaking batteries, which are warning signs of danger.
- Abnormal battery heating, abnormally prolonged charging time, or significant decrease in capacity may indicate that the battery has safety hazards.
- Discovering these warning signs in time and stopping using the problematic battery can effectively prevent fires.
Correct disposal method
- Do not throw old batteries in the trash, use appropriate disposal procedures and take used batteries to a recycling facility.
- Proper disposal prevents environmental pollution and safety risks, and is especially important for businesses that use battery storage on a large scale.
- Businesses should arrange for regular inspections of fire extinguishing systems. Compliance with relevant safety regulations is essential to ensure safety.
Conclusion
Lithium battery fires are a dangerous safety hazard that require the correct approach. The use of large amounts of water cooling, specialized fire extinguishers or encapsulating agents are effective methods. Prevention is the best strategy, including using the right charger, avoiding overcharging, storing batteries properly, etc. Understanding the characteristics and response methods of lithium battery fires can effectively protect personal and property safety.