Lithium battery is a kind of widely used secondary battery. For the lithium batteries for caravans carried by electric vehicle, the service life and charge and discharge safety are the most concerned issues of users. At the same time, due to the fire safety department, property, etc., do not allow residents to carry out indoor charging, resulting in an increase in the charging cost of users with cars, that is, residents to "quietly" carry out indoor charging, causing a number of fires and explosions. Is it really dangerous to charge a battery car indoors? Why does the same charging operation as outdoors cause deflagration?

Lithium-ion batteries generally have several stages in the charging process, such as pre-voltage charging, constant current charging/constant voltage charging, trickle charging, and charging termination, which is similar to mobile phone charging, so when charging lithium-ion batteries, the voltage and current of the charger must match the specifications of the lithium battery; At the same time, lithium-ion batteries must avoid overcharging the battery in the charging process, that is, with the charger provided by the manufacturer, do not carry out more than 12 hours of ultra-long charging, lithium-ion batteries in any form of overcharging will lead to serious damage to battery performance, and even explosion.

Are lithium batteries safe to charge at home/indoors?

Whether it is the publicity of the national security department or the safety tips of the property, users are warned that they should not charge lithium batteries outdoors and charge large equipment (battery cars, etc.) equipped with lithium batteries indoors, and avoid exposure to the sun and water.

According to the Chinese fire department's many publicity warnings, the public can see the information of a number of battery car charging deflagration across the country. The reason for this unexpected situation is that the environment during the charging of the lithium battery cannot dissipate heat in time, the internal temperature is high, exceeding the normal working temperature of the lithium battery, causing the melting or contraction of the organic matter inside the battery, and then causing the positive and negative short-circuiting of the battery, and the spontaneous combustion explosion caused by the battery short circuit.

In addition, although there are better protection schemes, such as lithium battery protection panels, high-specification explosion-proof lithium batteries, etc., the characteristics of lithium batteries themselves will still cause the battery temperature to be too high in the indoor scene, and the accumulation of flammable gases (such as hydrogen, oxygen, etc.) under chemical reactions will still lead to thermal runaway of the battery to a certain extent.

Charging head network summary

Above, the charging head network from the battery type of the battery car, the working principle of the lithium battery, the working temperature and charging equipment are introduced, the lithium battery in the room charging, mainly due to the environmental temperature can not be timely ventilation heat dissipation or overcharge, resulting in a sharp rise in the internal temperature caused by a series of chain reactions, the battery short circuit caused by spontaneous combustion explosion.

No brand of charger or battery can avoid the safety problems caused by improper use, therefore, whether it is a lithium battery or a lead-acid battery, the battery car can not be charged indoors, pay attention to fire protection, and stay away from danger.