Electric vehicle charging stations solve the safety problem of charging electric vehicles.

Electric vehicle charging stations solve the safety problem of charging electric vehicles.

At around 2am on April 13th, an electric bicycle fire accident occurred in Wangyuan Dongli Community, Fengtai District, resulting in the death of a mother and daughter. According to the investigation, it was originally caused by electric vehicles charging indoors.

Electric bicycles, electric motorcycles, and electric tricycles are the main components of electric vehicles, and fires caused by batteries that provide power for them and battery fires can easily cause casualties. When burned, they often produce a large amount of black smoke and toxic and harmful gases.

Electric bicycle fires often occur at night, especially during concentrated charging hours, which are difficult to detect and can result in casualties; Electric bicycle fires are prone to occur in community carports, the first floor of buildings, corridors, and residents' homes. After a fire occurs, a large amount of toxic and harmful smoke is produced, causing casualties; The causes of electric bicycle fires are complex, including aging of the circuit, short circuit of the battery, mismatched charger, and overcharging.

The cause of electric bicycle fire accidents is that electric bicycles have developed rapidly in recent years and have a high social penetration rate. Electric bicycle fires can easily cause casualties, with one out of every three major fires being caused by electric bicycles. There are many reasons that can cause electric bicycle fires, which can be summarized as follows:

01 Improper charging behavior

The electric bicycle battery is overcharged beyond the time limit, causing the charger and battery to continue heating up, resulting in a fire. Connecting temporary wires privately or pulling "flying wires" from indoors to charge electric bicycles can easily damage the power cord and cause fires. The charger and battery models do not match, and consumers replace the electric bicycle battery or purchase a similar model of charger without authorization during use. The mismatch in parameter models leads to high voltage during charging, aggravated battery dehydration, and high temperature rise, resulting in explosions. In addition, charging in evacuation areas such as public staircases, corridors, and emergency exits can block safe passages after a fire, which can easily cause casualties.

02 Poor quality of electrical components



Some manufacturers, in order to maximize economic benefits, use inferior core components such as controllers, chargers, batteries, motors, etc., resulting in technical indicators that do not match each other between different specifications and models of components, and lack of charging overcurrent protection function, which has artificially planted safety hazards. Some electric bicycles have unqualified technical indicators for undervoltage and overcurrent protection, and some even do not have short-circuit protection devices installed. Some, even if short-circuit protection devices are installed, are not connected to the circuit or are dismantled without authorization during maintenance or modification, resulting in the loss of short-circuit protection function.

03 Irregular Line Layout

Some companies have not selected appropriate wire diameter circuits as required, and the circuit connectors do not have waterproof, moisture-proof, and leakage proof functions. When modifying an electric bicycle, the route is randomly selected and no protective device is installed. In addition, the assembly process is unreasonable. Once high voltage or high current passes through, it is easy to cause ignition and heating with other accessories, leading to a fire.

04 Insufficient use, maintenance and upkeep

Batteries that have exceeded their service life and are not replaced in a timely manner can easily cause spontaneous combustion and fire. Users who increase the power load without authorization, install anti-theft, lighting, audio and other electrical facilities on their own, and modify components such as motors and batteries to increase the load capacity and speed, can easily lead to overloading of the power lines and cause fires. Not paying attention to maintenance and inspection in daily life, repairing by oneself or handing over to non professionals for repair, and arbitrarily changing the internal circuit may cause the internal circuit of the electric bicycle to be disordered, which may lead to a fire.

It turns out that electric vehicles have such terrible fire hazards indoors and in corridors. So how can we solve the problems of parking and charging normally?
1. When purchasing electric vehicles or accessories, it is important to choose qualified products and select branded vehicles as much as possible. When making a purchase, it is important to ensure that the electric vehicle is of reliable quality and has relevant protective functions. In addition, the accessories of the charger should also be matched with the electric bicycle.

2. Do not park electric vehicles in public areas such as shared walkways, stairwells, and emergency exits for charging. There is experimental evidence that after 90 seconds of ignition, the temperature of an electric vehicle can reach 200 degrees. If an electric vehicle is parked in a public area such as a hallway, once it catches fire, with the rapid development of the fire, the toxic gas produced by an electric vehicle can even kill hundreds or thousands of people! So, be sure not to park electric vehicles randomly, and never charge them illegally. The place where electric vehicles are parked should be strictly separated from the residential area.

3. Charging equipment should be selected with original equipment to avoid voltage and current mismatch during charging, which may cause battery damage. Inconsistent voltage between electric vehicle charger and battery can result in the inability to charge if the nominal voltage of the charger is lower than the battery voltage; When the nominal voltage of the charger is higher than the voltage of the battery, it can damage the battery and even cause a fire or explosion. The voltage of the battery will increase with the increase of its storage capacity, and the charger changes the charging voltage (or strategy) based on the voltage changes of the battery. When the nominal voltage of the charger is different from the nominal voltage of the battery, it will give the charger an incorrect message, causing the charger to adopt an unsuitable charging strategy for the battery. The result is that when the nominal voltage of the charger is lower than the voltage of the battery, it will not be able to charge; When the nominal voltage of the charger is higher than the voltage of the battery, it can damage the battery and even cause a fire or explosion.

3. Strictly charge, do not charge for too long, and do not privately pull wires for charging. According to previous cases, electric vehicle fire accidents often occur during nighttime charging. This period is often when people are sound asleep, and even if a fire is detected, thick smoke may be billowing around them, causing them to faint on the ground before they can escape.

4. Electric vehicles should pay attention to regular maintenance and upkeep

Firstly, it is important to pay attention to maintenance and inspection in daily life, and avoid using "expired" batteries. The service life of electric vehicle batteries is generally 1-2 years;

Secondly, do not use electric vehicles in adverse weather and environmental conditions, as exposure to sunlight and rain can also easily cause fires;

Thirdly, after an electric vehicle malfunctions, it should be promptly repaired at a regular repair shop;

Fourthly, do not ride overloaded to avoid damage to the motor and battery, and to prevent potential hazards.

5. Install smart charging station equipment for residential areas

At present, smart charging stations for electric bicycles represented by Srepower charging stations on the market have safety protection functions such as full charge self stop, leakage protection, short circuit protection, and overload prevention. Installing smart charging station facilities in residential areas not only facilitates the charging of electric vehicles for residents, but also effectively ensures safe charging safety. In addition, building a unified charging station is conducive to standardizing the parking management of electric bicycles, and the overall environment of the community is greatly improved!
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