The methods of safely charging lithium batteries

In recent years, explosions of lithium batteries have been commonplace. Recently, a scooter charging explosion has occurred. How to safely charge the lithium batteries of mobile phones, scooters and other products? Let's learn together.

Recently, some media have exposed a video of a smoke and explosion when charging an electric scooter. It can be described as thrilling. The whole process is only 18 seconds. After reading it, it makes people feel worried. The video shows that at about 5:30 pm on July 29, the family is sitting on the sofa and resting. The electric skateboard that is charging suddenly starts to smoke, and then a loud noise is heard, which scares the dog to jump.

The man immediately walked over and unplugged the power, but the smoke was getting more and more, and when he couldn’t control it, the man immediately picked up the child and fled the scene.

The scooter exploded and the whole process took only 18 seconds.

Lithium battery explosion

In fact, most of the small-sized mobility tools that people often use today use lithium batteries. In recent years, lithium battery explosions have been commonplace, with the exception of electric vehicles and electronic products such as mobile phones. Why does the lithium battery explode?

How to safely use lithium batteries when the scooter is charging and exploding

1. Long-term overcharge of the battery core: Under the condition of long-term charging, overcharge and over current will also lead to high temperature and high pressure, which may cause hidden dangers. Lithium batteries may instantaneously discharge under special conditions of temperature, humidity and poor contact, and generate a large amount of current, causing spontaneous combustion or explosion.

2. Battery short circuit: When the mobile phone is in a high temperature state, or subjected to impact, metal friction, etc., the battery may be short-circuited and explode.

3. Charging causes the battery to explode: while charging while playing the mobile phone, while charging while charging will lead to longer charging time, long-term charging, it will cause the phone temperature to rise, more likely to explode.

4. The charger and the battery do not match: the general mobile phone has the original charger. A charger of the wrong type is prone to battery accidents. Apple phones only accept the original charger to charge, which greatly reduces the chance of battery explosion.

5. The temperature is too high: too high temperature means that the internal heat of the battery has reached the limit, long-term charging, high temperature irradiation, baking are easy to cause the battery temperature is too high. In the south of China, electric ovens are used in general households in winter. Many people like to play mobile phones while roasting fire in the electric oven. This is also very dangerous.

6. Thermal runaway: The reason why lithium-ion batteries are explosive is due to a process called “thermal runaway” in the internal reaction of the battery. "Thermal runaway" is energy positive feedback loop process: elevated temperatures cause the system to heat up, and the system heats up to raise the temperature, which in turn makes the system hotter. The above reasons, such as battery short circuit, high ambient temperature, frequent overcharge, unauthorized modification of the casing, etc., will cause the lithium-ion battery to run out of control, and may eventually cause fire or explosion.

The battery of the brand mobile phone itself is relatively rare, and the battery itself has problems in the refurbished machine or the second mobile phone. In order to save costs, the second mobile phone or refurbished machine tends to choose a lower quality battery in the mobile phone configuration. These batteries have a low cost, too many impurities, a poor design process, and a high risk of self-explosion.

How to safely use lithium batteries when the scooter is charging and exploding

How to safely charge a lithium battery?

Whether it is a scooter, a balance car, or an electric bicycle, you must pay attention to safety when charging.

1. Charging time is reasonable. Charging time should not be too long, electric bicycles are generally controlled within 8 hours. Charging is best carried out during the day, parked in the centralized charging pile of the community, and there is a special person to take care of. Electric scooters and balancers must read the instructions carefully and charge them according to their specified time.

2. Use the original charger, do not mix the charger, or buy a poor quality charger.

3. Please be sure to keep away from flammable materials when charging, and place the charger in a place where it is easier to dissipate heat.

4. The charging area should be set with special charging equipment to have functions such as timed power off, overload protection, short circuit protection and leakage protection.

5. Do not charge the wire for charging, and charge it at the regular electric vehicle charging station.

The page contains the contents of the machine translation.