Battery car explosion cause identification

The reasons why electric vehicles explode are as follows: 1. Purchase inferior products, and unscrupulous merchants use inferior or recycled batteries in automobiles, making electric vehicles prone to fires. 2. Decorate privately. In order to achieve certain effects, users privately modify electric vehicles, such as adding batteries, installing audio, etc., causing circuit instability or overloading and causing fires. 3. Charging line problems. The charging line is aging or the diameter of the wire is too small, resulting in the inability to withstand the charging power, causing overheating and causing a fire. 4. If the charging time is too long, the battery will overcharge and may easily burn and cause a fire.
In the case of battery car explosion cause identification cases, Zhongke Testing can provide battery car explosion cause identification services.

The reason for the explosion of electric vehicles may be that the generator generates too much power, that is, the regulator of the generator is damaged, and charging causes an internal short circuit in the battery, causing an explosion.
Electric vehicles have been used for a long time, and the connection lines in the vehicle are prone to aging and short-circuiting.
In addition, unauthorized modifications can also cause short circuits. If the wires in the car are short-circuited and the outside temperature is too high, combustion can easily occur.
Using an unmatched charger may also cause the electric vehicle to catch fire.

GB 17761-2018 Safety technical specifications for electric bicycles
GB/T 22199.1-2017 Valve-regulated lead-acid batteries for electric mopeds Part 1: Technical conditions
GB/T 22199.2-2017 Valve-regulated lead-acid batteries for electric mopeds Part 2: Product varieties and specifications
GB/T 36972-2018 Lithium-ion battery for electric bicycles
GB/T 36944-2018 Technical requirements for chargers for electric bicycles
GB/T 36945-2018 Glossary of lithium-ion batteries for electric bicycles
GB/T 37645-2019 Dimension series and safety requirements for battery boxes for electric bicycles
GB/T 36943-2018 Model naming and marking requirements for lithium-ion batteries for electric bicycles
GB/T 42236.1-2022 Centralized charging facilities for electric bicycles Part 1: Technical specifications

Wang bought an electric car to commute to work. One night, Wang placed his electric car on the first floor of his home to charge. Suddenly he heard a loud noise and rushed downstairs to find that the electric car exploded. Wang and his family rushed to put out the fire and finally brought the fire under control. But when the property was finally counted, it was found that in addition to the electric car being burned, a lot of property was also lost on the first floor. Therefore, Wang took the seller to court and demanded compensation for economic losses.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems that caused the explosion" of the battery car involved in the case.
identification and analysis results:
The identification and analysis expert team inspected the accident battery car and battery cars produced in the same batch, and identified the cause of the explosion on the battery through on-site traces. The following suggestions and conclusions were made:
The battery charging voltage of this batch of battery cars was relatively high, and hydrogen and oxygen were precipitated in a ratio of 2:1. When mixed with air to a certain ratio, an explosion will occur when encountering an open flame.
In addition, the edge of the internal partition of the battery was damaged, which would cause the current to increase during use, generate sparks, and cause an explosion.
Therefore, the battery of the battery car involved had quality problems, which was the main reason for the accident.