Analysis on Fire Accident of Electric Vehicle
Analysis on Fire Accident of Electric Vehicle,
Fire Accident,
▍Compulsory Registration Scheme (CRS)
Ministry of Electronics & Information Technology released Electronics & Information Technology Goods-Requirement for Compulsory Registration Order I-Notified on 7th September, 2012, and it came into effect on 3rd October, 2013. Electronics &Information Technology Goods Requirement for Compulsory Registration, what is usually called BIS certification, is actually called CRS registration/certification. All electronic products in the compulsory registration product catalog imported to India or sold in the Indian market must be registered in the Bureau of Indian Standards (BIS). In November 2014, 15 kinds of compulsory registered products were added. New categories include: mobile phones, batteries, power banks, power supplies, LED lights and sales terminals, etc.
▍BIS Battery Test Standard
Nickel system cell/battery: IS 16046 (Part 1): 2018/ IEC62133-1: 2017
Lithium system cell/battery: IS 16046 (Part 2): 2018/ IEC62133-2: 2017
Coin cell/battery is included in CRS.
▍Why MCM?
● We have been focused on Indian certification for more than 5 years and helped client obtain the world’s first battery BIS letter. And we have practical experiences and solid resource accumulation in BIS certification field.
● Former senior officers of Bureau of Indian Standards (BIS) are employed as certification consultant, to ensure case efficiency and remove the risk of registration number cancellation.
● Equipped with strong comprehensive problem solving skills in certification, we integrate indigenous resources in India. MCM keeps good communication with BIS authorities to provide clients with the most cutting-edge, most professional and most authoritative certification information and service.
● We serve leading companies in various industries and earn a good reputation in the field, which make us deeply trusted and supported by clients.
According to data recently released by China’s Ministry of Emergency Management, 640 fire accidents of new energy vehicle were reported in the first quarter of 2022, a 32% increase over the same period last year, with an average of 7 fires per day. The author conducted statistical analysis from the state of some EV fires, and found that the rate of fire in the non-use state, driving state and charging state of EV are not very different from each other, as shown in the following chart. The author will make a simple analysis of the causes of fires in these three states and provide safety design suggestions.
Regardless of what situation causing the battery fire or explodes, the root cause is the short circuit inside or outside the cell, which resulting in thermal runaway of the cell. After the thermal runaway of a single cell, it will eventually lead to the entire pack catching fire if thermal propagation cannot be avoided due to structure design of module or pack. Causes of internal or external short circuit of the cell are (but not limited to): overheating, overcharge, over discharge, mechanical force (crush, shock), circuit aging, metal particles into the cell in production process, etc.
When the cell receives heat external or self-generated heat and cannot dissipate in time, and the temperature of the cell exceeds the temperature of the internal material (separator), the separator will contract, resulting in a short circuit between the positive and negative electrodes.
