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The battery industry experts mentioned above told the reporter of China Automotive News that every time an electric vehicle catches fire, both the vehicle company and the supporting battery company attach great importance to it. They will send technical experts to the scene to understand the situation, and transport the vehicle after the fire back for further disassembly to find the true cause of the fire. He told reporters that from the results of disassembly analysis, the cause of most electric vehicle fires is not the battery itself, but rather various defects in the battery pack. He said that there were many defects in the design of the battery pack at the beginning, which buried safety hazards. Once the safety hazards accumulated to a certain extent, they would eventually cause electric vehicles to catch fire and burn.

It is not difficult to find that most of the recent electric vehicle fire accidents are located in the south of China, which is closely related to the recent large-scale rainfall in the south. The expert stated that electric vehicles have high waterproof requirements, and if they reach the IP67 waterproof level, the safety of electric vehicles will be guaranteed. If the waterproof level of electric vehicles does not meet the requirements, the waterproof effect of electric vehicles will be weakened after long-term use, and rainwater, road water, etc. may corrode the battery system, leading to battery short circuits. The expert told China Automotive News that the battery short circuit caused by the weakened waterproof performance of electric vehicles does not occur inside the battery, but in the battery pack, leading to a combustion accident.

So, why not improve the waterproof level of the battery? The expert said that achieving a higher waterproof level will increase the cost of electric vehicles and weaken the price competitiveness of products. The expert gave an example to a reporter from China Automotive News, stating that the price of using wiring harnesses in batteries is about 1200 yuan, while the price of ordinary wiring harnesses is about 500 yuan, which is more than twice the price difference between the two.

At present, the prices of A0 or A00 level electric vehicles in the market are relatively low, which is related to the company's special emphasis on cost savings. However, when companies emphasize cost savings, their vigilance towards safety may be relaxed. The expert said that there is another situation that is worth noting. Some company procurement personnel attribute the significant difference in wire harness prices to supporting companies' false pricing and refuse to purchase waterproof and standard wire harnesses, This misconception can also lead to safety deficiencies in the design of battery packs from the beginning.

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