Is it dangerous to overcharge the electric wheelchair battery?

Is it dangerous to overcharge the electric wheelchair battery?

More and more electronic products must be charged to “last”. I believe that in daily life, many electric wheelchair manufacturers charge their batteries overnight. Do you know the dangers of overcharging the batteries of electric wheelchair manufacturers?

While electric wheelchair manufacturers bring convenience, their safety risks cannot be ignored. Data shows that in recent years, there have been many fires caused by electric vehicles in China, 80% of which were caused by overcharging of electric vehicle batteries. The same is true for electric wheelchair batteries. When the battery is overcharged, it is easy to explode, ignite the plastic parts of the electric vehicle, and release a large amount of toxic smoke, causing losses to people and property.

Accidents where batteries catch fire while charging occur from time to time. Battery fires and explosions are generally caused by chemical and electrochemical reactions between the active materials and electrolyte components inside the battery, which generate a large amount of heat and gas. Overcharging, overheating, short circuit and impact are all causes of battery explosion and fire. When the battery is overcharged, excess lithium ions overflow from the positive electrode and react with the solution, releasing heat to heat the battery, triggering the reaction between metallic lithium and the solvent, and the lithium-embedded carbon and the solvent, generating a large amount of heat and gas, causing the battery to explode.

Usually rechargeable batteries are equipped with a protection circuit. Once over-voltage, over-current, etc. cause damage to the battery, the protection system will automatically identify it and change the current from large to small. In this way, the battery will stop charging, so it will not cause Fire and explosion, but some battery manufacturers may not design protection circuits due to price and other considerations. In this case, when charging for a long time, the battery will easily react inside, generating a large amount of heat and gas, resulting in fire or explosion. ACCIDENT.
In addition, after the battery is short-circuited or hit, the positive electrode is prone to thermal decomposition and generates a large amount of heat, which may lead to explosion and fire of the battery.