-(4)Industry experts dismantle accident vehicles and discover that battery packs are an important cause of electric vehicle spontaneous combustion

(4)Industry experts dismantle accident vehicles and discover that battery packs are an important cause of electric vehicle spontaneous combustion
author:enerbyte source:本站 click407 Release date: 2023-07-11 14:23:09
abstract:
In addition, in order to promote the development of electric vehicles, China has established higher subsidy standards, and both central and local subsidies have put forward requirements for driving range. In order to meet the requirements for driving range, car companies generally adopt two me...

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In addition, in order to promote the development of electric vehicles, China has established higher subsidy standards, and both central and local subsidies have put forward requirements for driving range. In order to meet the requirements for driving range, car companies generally adopt two methods: one is to increase the energy density of the battery (with considerable technical difficulty); The second is to install more batteries. Installing more batteries means that costs will increase and products will lack market competitiveness. In order to meet subsidy standards and ensure that costs do not significantly increase, some companies have adopted a relaxation of BMS (a part of battery pack grouping) management, but this means reducing battery safety control. Relaxing BMS requirements inevitably brings safety hazards, which can cause electric vehicles to catch fire and burn when BMS suddenly fails, "the expert said.

According to data, more than 70% of the causes of electric vehicle fires are Thermal runaway. The expert told China Auto News that the Thermal runaway inside the battery is rarely caused by the battery itself. In most cases, it is external factors that cause the Thermal runaway inside the battery, and external factors are closely related to the battery pack. For example, a battery installed in a battery pack may experience friction between the batteries due to vibrations during driving. This friction may seem subtle, but over time, it may undergo qualitative changes, leading to a short circuit in the battery pack. The expert told a reporter from China Automotive News that vehicles cannot be prevented from shaking in any state, which puts forward high requirements for the fixation of the batteries in the battery pack, especially the fixation of cylindrical batteries.

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