Risk of Fire and Explosion...? Handheld Fans Can Be Dangerous! Four "Signs of Explosion" to Watch Out for in Summer

2025年07月27日 21:00

1. Introduction: Fire Risks Hidden in Convenient "Cool"

In the past, handheld fans and folding fans were the mainstream in Japanese summers, but recently, USB rechargeable or battery-operated "handheld fans" have flooded the streets. They are particularly popular among women and students and are becoming part of fashion items. However, since the 2020s, accidents such as "explosions" and "fires" have frequently occurred. Many of these incidents are believed to be caused by malfunctions in lithium-ion batteries or poor designs in cheap overseas products.

2. Case Studies of Fire Accidents: Actual "Explosion Incidents" in Japan

July 2023: Explosion Accident in a Commercial Facility in Tokyo
Smoke suddenly erupted from a handheld fan used by a woman, igniting her clothing. Fortunately, she only suffered minor injuries, but several people nearby evacuated.
August 2022: Fire Accident Inside an Elementary School Student's Bag
The battery overheated while in the bag, filling the classroom with smoke.

3. Four Warning Signs to Prevent Explosions

① The area around the switch is abnormally hot

If the power button or handle is unusually hot, there is a high possibility of a malfunction in the circuit board or battery. Stop using it immediately.

② Battery swelling or deformation

If the body is swollen or the cover seems about to open, it's evidence of battery deterioration. Dispose of it immediately.

③ Unusual noises like clicking or buzzing

If you hear "abnormal noises" other than the rotation sound, it could be a precursor to a short circuit or circuit malfunction. Do not ignore it and stop immediately.

④ Charging is unusually fast/slow

If it becomes fully charged in a short time or charging does not progress, there may be a risk of battery deterioration or overcurrent.

4. How to Choose a Safe Handheld Fan

Check for the PSE mark
Products that meet Japanese safety standards have a "PSE mark." Avoid products without this mark.
Is the price unusually low?
Products priced extremely low, such as under 500 yen, may have poor internal components.
Check for the manufacturer's and seller's information
Also check for the manufacturer's name and country of manufacture.

5. Correct Usage and Storage Methods

Limit continuous use to 15 minutes
Using it for a long time can cause overheating. Turn off the power frequently to cool it down.
Do not leave it in a hot car
Avoid this as high temperatures can cause the battery to swell or burst.
Keep it dry
Short circuits can increase the risk of fire.

6. What to Do When Abnormalities Occur

Remove it immediately if you sense smoke or heat
Cover it with gloves or cloth to prevent fire.
Do not pour water on it, leave it alone
Lithium batteries can explode with water, so contact a specialist after cooling.
Turn off the power and unplug
If an abnormality occurs during USB charging, cut the power first to prevent sparks.

7. Frequently Asked Questions

Q. Can handheld fans be brought on airplanes?
→ It depends on the battery capacity. Generally, they can be brought on board but not in checked luggage.
Q. Are 100-yen store fans dangerous?
→ It depends on the product. It's important to check for the PSE mark and design reliability.

8. Recommended Safe Models: Top 5 Picks

Panasonic Handy Fan
MUJI "USB Rechargeable Fan"
ELECOM USB FAN (PSE Certified)
Anker BREEZE Fan
Iris Ohyama Neck Fan

9. Conclusion: Convenience and Safety Can Coexist

Handheld fans can be a safe and comfortable ally in summer if used correctly and chosen wisely. The key is not to overlook "signs of abnormalities." To safely get through the scorching heat that comes every year, use the knowledge from this article to prevent risks for yourself and your family.

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